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Posted to users@tomcat.apache.org by vicky <vi...@yahoo.co.in> on 2012/12/07 17:48:17 UTC
Tomcat 6.0 CLASSPATH query
Hi Guys,
I have a requirement in which i need to add couple of properties files to tomcat CLASSPATH as these are needed for my application deployed in Tomcat 6.0.
One strange thing is that, i need to add the all my properties files to "<CATALINA_BASE>/bin" directory else these all wont get added to Tomcat classpath.
I just want to confirm that is it by design that if i want to add any properties file to Tomcat CLASSPATH then adding files to " <CATALINA_BASE>/bin " directory
is the solution we have or something else we can also do ??? Please suggest
Why cant we add files to " <CATALINA_BASE>/conf" directory so that it get added to tomcat CLASSPATH
Thanks
Vicky
Re: Tomcat 6.0 CLASSPATH query
Posted by Konstantin Kolinko <kn...@gmail.com>.
2012/12/7 vicky <vi...@yahoo.co.in>:
> Hi Guys,
>
> I have a requirement in which i need to add couple of properties files to tomcat CLASSPATH as these are needed for my application deployed in Tomcat 6.0.
>
> One strange thing is that, i need to add the all my properties files to "<CATALINA_BASE>/bin" directory else these all wont get added to Tomcat classpath.
>
> I just want to confirm that is it by design that if i want to add any properties file to Tomcat CLASSPATH then adding files to " <CATALINA_BASE>/bin " directory
> is the solution we have or something else we can also do ??? Please suggest
>
> Why cant we add files to " <CATALINA_BASE>/conf" directory so that it get added to tomcat CLASSPATH
>
1. Have you studied the docs? There is a chapter on class loaders and
class paths.
2. Blindly adding the conf directory to the classpath will break logging.
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Re: Tomcat 6.0 CLASSPATH query
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Vicky,
On 12/9/12 2:06 PM, vicky wrote:
> Thanks MARK/CHRIS for all earnest replies, i really owe you guys
> for your replies.
>
> Exporting CLASSPATH wont work ad i believe that Tomcat "catalina.sh
> " will ignore it.
>
> Anyway i am able to fetch the "resource/properties file " contents
> if i place in "$CATALINA_BASE/bin" directory.
That is surprising to me. How does your code load the properties file?
I'll bet you aren't even using the ClassLoader (and you *should* be).
> Actually i read the documentation but no where its been written
> that by adding resource files to "$CATALINA_BASE/bin" , tomcat
> will make them available in its CLASSPATH
I don't believe it's true, so it shouldn't be in the documentation.
> This is weird for me to understand, if you have any thoughts on
> this behavior then please share """" else we can close this email
> thread""""
Nobody should be using CATALINA_BASE/bin for anything: it's for Tomcat's
bootstrap classes only.
I'm fairly sure that simply dropping a file in there won't do anything
at all, unless you have modified Tomcat from its original configuration.
If you want something to be globally available, use CATALINA_BASE/lib or
configure a shared.loader in catalina.properties. Oh, and write your
code properly to load from the class path.
- -chris
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Re: Tomcat 6.0 CLASSPATH query
Posted by vicky <vi...@yahoo.co.in>.
Thanks MARK/CHRIS for all earnest replies, i really owe you guys for your replies.
Exporting CLASSPATH wont work ad i believe that Tomcat "catalina.sh " will ignore it.
Anyway i am able to fetch the "resource/properties file " contents if i place in "$CATALINA_BASE/bin" directory.
Actually i read the documentation but no where its been written that by adding resource files to "$CATALINA_BASE/bin" , tomcat will make them available in its CLASSPATH
This is weird for me to understand, if you have any thoughts on this behavior then please share """" else we can close this email thread""""
Thanks,
VIcky
________________________________
From: Mark Eggers <it...@yahoo.com>
To: Tomcat Users List <us...@tomcat.apache.org>
Sent: Sunday, 9 December 2012 10:43 PM
Subject: Re: Tomcat 6.0 CLASSPATH query
Reply is inline. Please do not top post. I had to read your response and
then scroll to the bottom to remember what I wrote.
On 12/8/2012 12:57 PM, vicky007aggarwal@yahoo.co.in wrote:
> Thanks Mark
>
> Sorry for the confusion i created related to my requirements. 5 Out
> of 6 requirements you stated below are correct. The last point i.e
> $CATALINA_BASE is writable. I can manipulate/write files to this
> location. So now do you have anything more to add to your proposed
> solution as you suggested below
>
>
>
> Thanks, Vicky
>
Make a directory under $CATALINA_BASE. Call it Resources. Then add in
$CATALINA_BASE/bin/setenv.sh something like the following:
CLASSPATH=$CATALINA_BASE/Resouces/your-resource.jar
export CLASSPATH
Again, I've not done this so who knows if it will work.
As Chris and I (and others) have said, these resources really belong in
WEB-INF/classes. I have described how you can include those in your
build environment.
I understand that you have 10 web applications and the configuration
files change frequently. At that point, if you don't want to
continuously bounce your web applications (or Tomcat), I would look at
an alternative way for reading resources. I suggested a database and JNDI.
. . . . just my two cents
/mde/
>
> On Dec 9, 2012, at 2:09 AM, Mark Eggers <it...@yahoo.com>
> wrote:
>
>> See at the end for a truly spectacularly bad potential solution.
>> Note that I have not tried this, so your mileage may vary.
>>
>> On 12/8/2012 11:51 AM, vicky wrote:
>>> Thanks Mark for your valuable suggestions.
>>>
>>> But in my project i have a requirement to share one
>>> "resource/properties file " across 10 applications deployed on
>>> single tomcat instance
>>>
>>> We cannot afford to add the same properties file to all archives
>>> as its contents keep changing.
>>>
>>> Another restriction which i have is that i cannot place any file
>>> under "$CATALINA_HOME" directories , these are read only for us.
>>>
>>> Based on afore said concerns, do you have any better way out
>>> ..please suggest.
>>>
>>> Appreciated all of your help
>>>
>>> Thanks for ur time Vicky
>>>
>>>
>>> ________________________________ From: Mark Eggers
>>> <it...@yahoo.com> To: Tomcat Users List
>>> <us...@tomcat.apache.org> Sent: Sunday, 9 December 2012 12:23 AM
>>> Subject: Re: Tomcat 6.0 CLASSPATH query
>>>
>>> Comments inline below (a bit fuzzy from the move yet).
>>>
>>> On 12/8/2012 9:58 AM, vicky wrote:
>>>>
>>>> I have read the Tomcat 6.0 classloader documentation(below
>>>> link), from this what i understood is that the
>>>> "classes/jar/resource/properties file" get loaded from the
>>>> following locations
>>>>
>>>> 1.Bootstrap classes of your JVM ($JAVA_HOME/jre/lib/ext).
>>>> 2.System class loader classes ( Add bootstrap.jar &
>>>> tomcat-juli.jar to CLASSPATH variable) 3.Common class loader
>>>> classes ( refers $CATALINA_BASE/lib & $CATALINA_HOME/lib ) &
>>>> uses $CATALINA_BASE/conf/catalina.properties 4.
>>>> /WEB-INF/classes of your web application 5. /WEB-INF/lib/*.jar
>>>> of your web application
>>>>
>>>> The thing which is still puzzling me is that how my
>>>> "resource/properties files" get loaded to Tomcat CLASSPATH when
>>>> i add them to "$CATALINA_BASE/bin" directory & When i move the
>>>> same files to $CATALINA_BASE/conf directory then it doesn't get
>>>> added to Tomcat CLASSPATH.
>>>>
>>>> My deployed applications need"properties/resource files ", Can
>>>> someone please help me in understand the optimal way of adding
>>>> these files to Tomcat CLASSPATH. Does placing the files under
>>>> <CATALINA_BASE>/bin is the right approach.Please suggest
>>>
>>> Why in the world are you adding these resource files to Tomcat's
>>> CLASSPATH? If the resources are application - specific, you
>>> don't need to do this at all.
>>>
>>> Just add the files to your local application. In Maven, there's
>>> a special directory for that:
>>>
>>> src/main/resources
>>>
>>> In NetBeans, I normally create a separate package for all of my
>>> configuration files.
>>>
>>> I think in Eclipse you'll have to make a subdirectory under
>>> WEB-INF/classes and copy the files there. That's unpleasant.
>>> Eclipse will include that in the build of the WAR file when you
>>> do an "export".
>>>
>>> Then, just do the following in your code to reference the
>>> resource.
>>>
>>> InputStream in =
>>> this.getClass().getClassLoader().getResourceAsStream(configfile);
>>>
>>>
>>>
Where configfile is the complete classpath to your resource.
>>>
>>> This is nice. It works in exploded WARs, it works in WAR files,
>>> it works in JARs.
>>>
>>> No mucking about with CLASSPATH. No polluting other applications
>>> or Tomcat with spurious application - specific resources. This
>>> enables you to run several copies of the same web application in
>>> the same container, all with different configurations.
>>>
>>> Just search for getResourceAsStream() for more explanation.
>>>
>>>> In my organisation i cannot add anything to "$CATALINA_HOME/lib
>>>> or bin" location ,these are read only directories
>>>>
>>>> http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html
>>>>
>>>>
Thanks for your help Vicky
>>>
>>> Not needed.
>>>
>>>>
>>>>
>>>> ________________________________ From: Pid * <pi...@pidster.com>
>>>> To: Tomcat Users List <us...@tomcat.apache.org> Sent: Saturday,
>>>> 8 December 2012 10:34 PM Subject: Re: Tomcat 6.0 CLASSPATH
>>>> query
>>>>
>>>> On 8 Dec 2012, at 03:29, "vicky007aggarwal@yahoo.co.in"
>>>> <vi...@yahoo.co.in> wrote:
>>>>
>>>>> Application is deployed under tomcat webapps directory . It
>>>>> tries to refer to application specific properties file from
>>>>> tomcat classpath, for that we copied it under tomcat bin
>>>>> directory.
>>>>>
>>>>> My query is that does this is the right way to add
>>>>> properties file to tomcat classpath?
>>>>
>>>> Did you try putting it in tomcat/lib?
>>>>
>>>>
>>>> p
>>>
>>>>
>>>>
>>>>
>>>>>
>>>>> Thanks for ur help, Vicky
>>>>>
>>>>>
>>>>>
>>>>> On Dec 8, 2012, at 2:11 AM, Christopher Schultz
>>>>> <ch...@christopherschultz.net> wrote:
>>>>>
>>>>>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
>>>>>>
>>>>>> Vicky,
>>>>>>
>>>>>> On 12/7/12 11:48 AM, vicky wrote:
>>>>>>> I have a requirement in which i need to add couple of
>>>>>>> properties files to tomcat CLASSPATH as these are needed
>>>>>>> for my application deployed in Tomcat 6.0.
>>>>>>>
>>>>>>> One strange thing is that, i need to add the all my
>>>>>>> properties files to "<CATALINA_BASE>/bin" directory else
>>>>>>> these all wont get added to Tomcat classpath.
>>>>>>
>>>>>> Where does the code live that attempts to load those
>>>>>> properties files?
>>>>>>
>>>>>> - -chris
>>>
>>> . . . just my (I hate moving) 2 cents /mde/
>>
>> Vicky,
>>
>> So let me now understand your requirements.
>>
>> 1. Properties files to be read by web applications 2. 10 web
>> applications on one Tomcat instance 3. All 10 web applications read
>> identical files 4. Property files change frequently 5.
>> $CATALINA_HOME and $CATALINA_BASE are read-only 6.
>> $CATALINA_BASE/lib and $CATALINA_BASE/bin are read-only
>>
>> In the future it would be a good idea to list all of your
>> requirements and restrictions at once, rather than having the list
>> extract it by recommending solutions which fail one or more
>> requirements.
>>
>> The approach (placing resource files on the CLASSPATH) is probably
>> not a good one given the requirements as you've stated them.
>>
>> If you're wedded to reading resources from a CLASSPATH, the only
>> reasonable way to live with the above requirements is to use files
>> in WEB-INF/classes. Then the application will have to be changed
>> each time you update the resource files. This all can be scripted
>> so that operations won't have too big of a burden.
>>
>> Placing the resources in a JAR somewhere on Tomcat's CLASSPATH
>> poses several problems.
>>
>> 1. You cannot modify the directories where Tomcat reads JARs 2. A
>> change to the resource will require a Tomcat restart
>>
>> One of the only ways I can see around this is as follows.
>>
>> 1. create a setenv.sh in $CATALINA_BASE/bin (or setenv.bat)
>>
>> I realize you do not have write access to this, but maybe
>> operations can create that file.
>>
>> 2. In that setenv.sh, add the following:
>>
>> CLASSPATH=/place/where/your/jar/is.jar EXPORT CLASSPATH
>>
>> 3. Make the /place/where/your/jar/is.jar readable
>>
>> This JAR file must be readable by the user running Tomcat
>>
>> 4. In is.jar add all your configuration files
>>
>> This is a pretty spectacularly bad solution for several reasons.
>>
>> 1. You're reading a file outside of Tomcat's directory structure 2.
>> Eunning under the security manager would be challenging 3. Tomcat
>> restart for changing the JAR with the properties files
>>
>> At this point, I would seriously look at scripting the 10 web
>> application updates, or loading the properties files in a database
>> and access them via JNDI.
>>
>> . . . . just my two cents. /mde/
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Re: Tomcat 6.0 CLASSPATH query
Posted by Mark Eggers <it...@yahoo.com>.
Reply is inline. Please do not top post. I had to read your response and
then scroll to the bottom to remember what I wrote.
On 12/8/2012 12:57 PM, vicky007aggarwal@yahoo.co.in wrote:
> Thanks Mark
>
> Sorry for the confusion i created related to my requirements. 5 Out
> of 6 requirements you stated below are correct. The last point i.e
> $CATALINA_BASE is writable. I can manipulate/write files to this
> location. So now do you have anything more to add to your proposed
> solution as you suggested below
>
>
>
> Thanks, Vicky
>
Make a directory under $CATALINA_BASE. Call it Resources. Then add in
$CATALINA_BASE/bin/setenv.sh something like the following:
CLASSPATH=$CATALINA_BASE/Resouces/your-resource.jar
export CLASSPATH
Again, I've not done this so who knows if it will work.
As Chris and I (and others) have said, these resources really belong in
WEB-INF/classes. I have described how you can include those in your
build environment.
I understand that you have 10 web applications and the configuration
files change frequently. At that point, if you don't want to
continuously bounce your web applications (or Tomcat), I would look at
an alternative way for reading resources. I suggested a database and JNDI.
. . . . just my two cents
/mde/
>
> On Dec 9, 2012, at 2:09 AM, Mark Eggers <it...@yahoo.com>
> wrote:
>
>> See at the end for a truly spectacularly bad potential solution.
>> Note that I have not tried this, so your mileage may vary.
>>
>> On 12/8/2012 11:51 AM, vicky wrote:
>>> Thanks Mark for your valuable suggestions.
>>>
>>> But in my project i have a requirement to share one
>>> "resource/properties file " across 10 applications deployed on
>>> single tomcat instance
>>>
>>> We cannot afford to add the same properties file to all archives
>>> as its contents keep changing.
>>>
>>> Another restriction which i have is that i cannot place any file
>>> under "$CATALINA_HOME" directories , these are read only for us.
>>>
>>> Based on afore said concerns, do you have any better way out
>>> ..please suggest.
>>>
>>> Appreciated all of your help
>>>
>>> Thanks for ur time Vicky
>>>
>>>
>>> ________________________________ From: Mark Eggers
>>> <it...@yahoo.com> To: Tomcat Users List
>>> <us...@tomcat.apache.org> Sent: Sunday, 9 December 2012 12:23 AM
>>> Subject: Re: Tomcat 6.0 CLASSPATH query
>>>
>>> Comments inline below (a bit fuzzy from the move yet).
>>>
>>> On 12/8/2012 9:58 AM, vicky wrote:
>>>>
>>>> I have read the Tomcat 6.0 classloader documentation(below
>>>> link), from this what i understood is that the
>>>> "classes/jar/resource/properties file" get loaded from the
>>>> following locations
>>>>
>>>> 1.Bootstrap classes of your JVM ($JAVA_HOME/jre/lib/ext).
>>>> 2.System class loader classes ( Add bootstrap.jar &
>>>> tomcat-juli.jar to CLASSPATH variable) 3.Common class loader
>>>> classes ( refers $CATALINA_BASE/lib & $CATALINA_HOME/lib ) &
>>>> uses $CATALINA_BASE/conf/catalina.properties 4.
>>>> /WEB-INF/classes of your web application 5. /WEB-INF/lib/*.jar
>>>> of your web application
>>>>
>>>> The thing which is still puzzling me is that how my
>>>> "resource/properties files" get loaded to Tomcat CLASSPATH when
>>>> i add them to "$CATALINA_BASE/bin" directory & When i move the
>>>> same files to $CATALINA_BASE/conf directory then it doesn't get
>>>> added to Tomcat CLASSPATH.
>>>>
>>>> My deployed applications need"properties/resource files ", Can
>>>> someone please help me in understand the optimal way of adding
>>>> these files to Tomcat CLASSPATH. Does placing the files under
>>>> <CATALINA_BASE>/bin is the right approach.Please suggest
>>>
>>> Why in the world are you adding these resource files to Tomcat's
>>> CLASSPATH? If the resources are application - specific, you
>>> don't need to do this at all.
>>>
>>> Just add the files to your local application. In Maven, there's
>>> a special directory for that:
>>>
>>> src/main/resources
>>>
>>> In NetBeans, I normally create a separate package for all of my
>>> configuration files.
>>>
>>> I think in Eclipse you'll have to make a subdirectory under
>>> WEB-INF/classes and copy the files there. That's unpleasant.
>>> Eclipse will include that in the build of the WAR file when you
>>> do an "export".
>>>
>>> Then, just do the following in your code to reference the
>>> resource.
>>>
>>> InputStream in =
>>> this.getClass().getClassLoader().getResourceAsStream(configfile);
>>>
>>>
>>>
Where configfile is the complete classpath to your resource.
>>>
>>> This is nice. It works in exploded WARs, it works in WAR files,
>>> it works in JARs.
>>>
>>> No mucking about with CLASSPATH. No polluting other applications
>>> or Tomcat with spurious application - specific resources. This
>>> enables you to run several copies of the same web application in
>>> the same container, all with different configurations.
>>>
>>> Just search for getResourceAsStream() for more explanation.
>>>
>>>> In my organisation i cannot add anything to "$CATALINA_HOME/lib
>>>> or bin" location ,these are read only directories
>>>>
>>>> http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html
>>>>
>>>>
Thanks for your help Vicky
>>>
>>> Not needed.
>>>
>>>>
>>>>
>>>> ________________________________ From: Pid * <pi...@pidster.com>
>>>> To: Tomcat Users List <us...@tomcat.apache.org> Sent: Saturday,
>>>> 8 December 2012 10:34 PM Subject: Re: Tomcat 6.0 CLASSPATH
>>>> query
>>>>
>>>> On 8 Dec 2012, at 03:29, "vicky007aggarwal@yahoo.co.in"
>>>> <vi...@yahoo.co.in> wrote:
>>>>
>>>>> Application is deployed under tomcat webapps directory . It
>>>>> tries to refer to application specific properties file from
>>>>> tomcat classpath, for that we copied it under tomcat bin
>>>>> directory.
>>>>>
>>>>> My query is that does this is the right way to add
>>>>> properties file to tomcat classpath?
>>>>
>>>> Did you try putting it in tomcat/lib?
>>>>
>>>>
>>>> p
>>>
>>>>
>>>>
>>>>
>>>>>
>>>>> Thanks for ur help, Vicky
>>>>>
>>>>>
>>>>>
>>>>> On Dec 8, 2012, at 2:11 AM, Christopher Schultz
>>>>> <ch...@christopherschultz.net> wrote:
>>>>>
>>>>>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
>>>>>>
>>>>>> Vicky,
>>>>>>
>>>>>> On 12/7/12 11:48 AM, vicky wrote:
>>>>>>> I have a requirement in which i need to add couple of
>>>>>>> properties files to tomcat CLASSPATH as these are needed
>>>>>>> for my application deployed in Tomcat 6.0.
>>>>>>>
>>>>>>> One strange thing is that, i need to add the all my
>>>>>>> properties files to "<CATALINA_BASE>/bin" directory else
>>>>>>> these all wont get added to Tomcat classpath.
>>>>>>
>>>>>> Where does the code live that attempts to load those
>>>>>> properties files?
>>>>>>
>>>>>> - -chris
>>>
>>> . . . just my (I hate moving) 2 cents /mde/
>>
>> Vicky,
>>
>> So let me now understand your requirements.
>>
>> 1. Properties files to be read by web applications 2. 10 web
>> applications on one Tomcat instance 3. All 10 web applications read
>> identical files 4. Property files change frequently 5.
>> $CATALINA_HOME and $CATALINA_BASE are read-only 6.
>> $CATALINA_BASE/lib and $CATALINA_BASE/bin are read-only
>>
>> In the future it would be a good idea to list all of your
>> requirements and restrictions at once, rather than having the list
>> extract it by recommending solutions which fail one or more
>> requirements.
>>
>> The approach (placing resource files on the CLASSPATH) is probably
>> not a good one given the requirements as you've stated them.
>>
>> If you're wedded to reading resources from a CLASSPATH, the only
>> reasonable way to live with the above requirements is to use files
>> in WEB-INF/classes. Then the application will have to be changed
>> each time you update the resource files. This all can be scripted
>> so that operations won't have too big of a burden.
>>
>> Placing the resources in a JAR somewhere on Tomcat's CLASSPATH
>> poses several problems.
>>
>> 1. You cannot modify the directories where Tomcat reads JARs 2. A
>> change to the resource will require a Tomcat restart
>>
>> One of the only ways I can see around this is as follows.
>>
>> 1. create a setenv.sh in $CATALINA_BASE/bin (or setenv.bat)
>>
>> I realize you do not have write access to this, but maybe
>> operations can create that file.
>>
>> 2. In that setenv.sh, add the following:
>>
>> CLASSPATH=/place/where/your/jar/is.jar EXPORT CLASSPATH
>>
>> 3. Make the /place/where/your/jar/is.jar readable
>>
>> This JAR file must be readable by the user running Tomcat
>>
>> 4. In is.jar add all your configuration files
>>
>> This is a pretty spectacularly bad solution for several reasons.
>>
>> 1. You're reading a file outside of Tomcat's directory structure 2.
>> Eunning under the security manager would be challenging 3. Tomcat
>> restart for changing the JAR with the properties files
>>
>> At this point, I would seriously look at scripting the 10 web
>> application updates, or loading the properties files in a database
>> and access them via JNDI.
>>
>> . . . . just my two cents. /mde/
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Re: Tomcat 6.0 CLASSPATH query
Posted by Pid * <pi...@pidster.com>.
On 9 Dec 2012, at 16:58, Christopher Schultz
<ch...@christopherschultz.net> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Pid,
>
> On 12/9/12 4:31 AM, Pid * wrote:
>> On 8 Dec 2012, at 20:57, "vicky007aggarwal@yahoo.co.in"
>> <vi...@yahoo.co.in> wrote:
>>
>>> Thanks Mark
>>>
>>> Sorry for the confusion i created related to my requirements. 5
>>> Out of 6 requirements you stated below are correct. The last
>>> point i.e $CATALINA_BASE is writable. I can manipulate/write
>>> files to this location. So now do you have anything more to add
>>> to your proposed solution as you suggested below
>>
>> 1. Please stop top-posting. 2. Put your resources in
>> CATALINA_BASE/lib
>
> Another option is to use a VirtualClassLoader and add some random path
> (/etc/myawesomewebapps/) to it in all webapps.
>
> Honestly, I think there are better ways to load shared configuration
> than trying to share a .properties file on the disk.
If the OP is able to edit files in CATALINA_BASE/lib, then editing
catalina.properties and appending a fixed path to common.loader in
each instance would also work.
p
> - -chris
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> Version: GnuPG/MacGPG2 v2.0.17 (Darwin)
> Comment: GPGTools - http://gpgtools.org
> Comment: Using GnuPG with undefined - http://www.enigmail.net/
>
> iEYEAREIAAYFAlDEwocACgkQ9CaO5/Lv0PDc7gCfUvtH3K16UuRR/PlRzjfeMYin
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> =E9GV
> -----END PGP SIGNATURE-----
>
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Re: Tomcat 6.0 CLASSPATH query
Posted by Mark Eggers <it...@yahoo.com>.
On 12/9/2012 12:26 PM, Caldarale, Charles R wrote:
>> From: Mark Eggers [mailto:its_toasted@yahoo.com]
>> Subject: Re: Tomcat 6.0 CLASSPATH query
>
>>> Another option is to use a VirtualClassLoader and add some random path
>>> (/etc/myawesomewebapps/) to it in all webapps.
>
>> That's only available in Tomcat 7, yes?
>
> Presumably, Chris was referring to VirtualWebappLoader, which has been available in Tomcat for ages. However, it wasn't properly documented until Tomcat 7.
>
> - Chuck
I found the docs for Tomcat 7, and didn't see them for Tomcat 6. I
should have trawled through the source (still getting settled after the
move).
I suppose I could look at the source, pattern the docs off of those from
Tomcat 7, and submit a patch.
. . . . just my two cents
/mde/
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RE: Tomcat 6.0 CLASSPATH query
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: Mark Eggers [mailto:its_toasted@yahoo.com]
> Subject: Re: Tomcat 6.0 CLASSPATH query
> > Another option is to use a VirtualClassLoader and add some random path
> > (/etc/myawesomewebapps/) to it in all webapps.
> That's only available in Tomcat 7, yes?
Presumably, Chris was referring to VirtualWebappLoader, which has been available in Tomcat for ages. However, it wasn't properly documented until Tomcat 7.
- Chuck
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Re: Tomcat 6.0 CLASSPATH query
Posted by Mark Eggers <it...@yahoo.com>.
On 12/9/2012 8:55 AM, Christopher Schultz wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Pid,
>
> On 12/9/12 4:31 AM, Pid * wrote:
>> On 8 Dec 2012, at 20:57, "vicky007aggarwal@yahoo.co.in"
>> <vi...@yahoo.co.in> wrote:
>>
>>> Thanks Mark
>>>
>>> Sorry for the confusion i created related to my requirements. 5
>>> Out of 6 requirements you stated below are correct. The last
>>> point i.e $CATALINA_BASE is writable. I can manipulate/write
>>> files to this location. So now do you have anything more to add
>>> to your proposed solution as you suggested below
>>
>> 1. Please stop top-posting. 2. Put your resources in
>> CATALINA_BASE/lib
>
> Another option is to use a VirtualClassLoader and add some random path
> (/etc/myawesomewebapps/) to it in all webapps.
>
That's only available in Tomcat 7, yes?
> Honestly, I think there are better ways to load shared configuration
> than trying to share a .properties file on the disk.
>
+1
> - -chris
/mde/
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Re: Tomcat 6.0 CLASSPATH query
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Pid,
On 12/9/12 4:31 AM, Pid * wrote:
> On 8 Dec 2012, at 20:57, "vicky007aggarwal@yahoo.co.in"
> <vi...@yahoo.co.in> wrote:
>
>> Thanks Mark
>>
>> Sorry for the confusion i created related to my requirements. 5
>> Out of 6 requirements you stated below are correct. The last
>> point i.e $CATALINA_BASE is writable. I can manipulate/write
>> files to this location. So now do you have anything more to add
>> to your proposed solution as you suggested below
>
> 1. Please stop top-posting. 2. Put your resources in
> CATALINA_BASE/lib
Another option is to use a VirtualClassLoader and add some random path
(/etc/myawesomewebapps/) to it in all webapps.
Honestly, I think there are better ways to load shared configuration
than trying to share a .properties file on the disk.
- -chris
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Re: Tomcat 6.0 CLASSPATH query
Posted by Pid * <pi...@pidster.com>.
On 8 Dec 2012, at 20:57, "vicky007aggarwal@yahoo.co.in"
<vi...@yahoo.co.in> wrote:
> Thanks Mark
>
> Sorry for the confusion i created related to my requirements.
> 5 Out of 6 requirements you stated below are correct. The last point i.e $CATALINA_BASE is writable. I can manipulate/write files to this location.
> So now do you have anything more to add to your proposed solution as you suggested below
1. Please stop top-posting.
2. Put your resources in CATALINA_BASE/lib
p
>
>
>
> Thanks,
> Vicky
>
>
>
> On Dec 9, 2012, at 2:09 AM, Mark Eggers <it...@yahoo.com> wrote:
>
>> See at the end for a truly spectacularly bad potential solution. Note that I have not tried this, so your mileage may vary.
>>
>> On 12/8/2012 11:51 AM, vicky wrote:
>>> Thanks Mark for your valuable suggestions.
>>>
>>> But in my project i have a requirement to share one
>>> "resource/properties file " across 10 applications deployed on single
>>> tomcat instance
>>>
>>> We cannot afford to add the same properties file to all archives as
>>> its contents keep changing.
>>>
>>> Another restriction which i have is that i cannot place any file
>>> under "$CATALINA_HOME" directories , these are read only for us.
>>>
>>> Based on afore said concerns, do you have any better way out ..please
>>> suggest.
>>>
>>> Appreciated all of your help
>>>
>>> Thanks for ur time Vicky
>>>
>>>
>>> ________________________________ From: Mark Eggers
>>> <it...@yahoo.com> To: Tomcat Users List
>>> <us...@tomcat.apache.org> Sent: Sunday, 9 December 2012 12:23 AM
>>> Subject: Re: Tomcat 6.0 CLASSPATH query
>>>
>>> Comments inline below (a bit fuzzy from the move yet).
>>>
>>> On 12/8/2012 9:58 AM, vicky wrote:
>>>>
>>>> I have read the Tomcat 6.0 classloader documentation(below link),
>>>> from this what i understood is that the
>>>> "classes/jar/resource/properties file" get loaded from the
>>>> following locations
>>>>
>>>> 1.Bootstrap classes of your JVM ($JAVA_HOME/jre/lib/ext).
>>>> 2.System class loader classes ( Add bootstrap.jar &
>>>> tomcat-juli.jar to CLASSPATH variable) 3.Common class loader
>>>> classes ( refers $CATALINA_BASE/lib & $CATALINA_HOME/lib ) & uses
>>>> $CATALINA_BASE/conf/catalina.properties 4. /WEB-INF/classes of
>>>> your web application 5. /WEB-INF/lib/*.jar of your web application
>>>>
>>>> The thing which is still puzzling me is that how my
>>>> "resource/properties files" get loaded to Tomcat CLASSPATH when i
>>>> add them to "$CATALINA_BASE/bin" directory & When i move the same
>>>> files to $CATALINA_BASE/conf directory then it doesn't get added to
>>>> Tomcat CLASSPATH.
>>>>
>>>> My deployed applications need"properties/resource files ", Can
>>>> someone please help me in understand the optimal way of adding
>>>> these files to Tomcat CLASSPATH. Does placing the files under
>>>> <CATALINA_BASE>/bin is the right approach.Please suggest
>>>
>>> Why in the world are you adding these resource files to Tomcat's
>>> CLASSPATH? If the resources are application - specific, you don't
>>> need to do this at all.
>>>
>>> Just add the files to your local application. In Maven, there's a
>>> special directory for that:
>>>
>>> src/main/resources
>>>
>>> In NetBeans, I normally create a separate package for all of my
>>> configuration files.
>>>
>>> I think in Eclipse you'll have to make a subdirectory under
>>> WEB-INF/classes and copy the files there. That's unpleasant. Eclipse
>>> will include that in the build of the WAR file when you do an
>>> "export".
>>>
>>> Then, just do the following in your code to reference the resource.
>>>
>>> InputStream in =
>>> this.getClass().getClassLoader().getResourceAsStream(configfile);
>>>
>>> Where configfile is the complete classpath to your resource.
>>>
>>> This is nice. It works in exploded WARs, it works in WAR files, it
>>> works in JARs.
>>>
>>> No mucking about with CLASSPATH. No polluting other applications or
>>> Tomcat with spurious application - specific resources. This enables
>>> you to run several copies of the same web application in the same
>>> container, all with different configurations.
>>>
>>> Just search for getResourceAsStream() for more explanation.
>>>
>>>> In my organisation i cannot add anything to "$CATALINA_HOME/lib or
>>>> bin" location ,these are read only directories
>>>>
>>>> http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html
>>>> Thanks for your help Vicky
>>>
>>> Not needed.
>>>
>>>>
>>>>
>>>> ________________________________ From: Pid * <pi...@pidster.com> To:
>>>> Tomcat Users List <us...@tomcat.apache.org> Sent: Saturday, 8
>>>> December 2012 10:34 PM Subject: Re: Tomcat 6.0 CLASSPATH query
>>>>
>>>> On 8 Dec 2012, at 03:29, "vicky007aggarwal@yahoo.co.in"
>>>> <vi...@yahoo.co.in> wrote:
>>>>
>>>>> Application is deployed under tomcat webapps directory . It
>>>>> tries to refer to application specific properties file from
>>>>> tomcat classpath, for that we copied it under tomcat bin
>>>>> directory.
>>>>>
>>>>> My query is that does this is the right way to add properties
>>>>> file to tomcat classpath?
>>>>
>>>> Did you try putting it in tomcat/lib?
>>>>
>>>>
>>>> p
>>>
>>>>
>>>>
>>>>
>>>>>
>>>>> Thanks for ur help, Vicky
>>>>>
>>>>>
>>>>>
>>>>> On Dec 8, 2012, at 2:11 AM, Christopher Schultz
>>>>> <ch...@christopherschultz.net> wrote:
>>>>>
>>>>>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
>>>>>>
>>>>>> Vicky,
>>>>>>
>>>>>> On 12/7/12 11:48 AM, vicky wrote:
>>>>>>> I have a requirement in which i need to add couple of
>>>>>>> properties files to tomcat CLASSPATH as these are needed for
>>>>>>> my application deployed in Tomcat 6.0.
>>>>>>>
>>>>>>> One strange thing is that, i need to add the all my
>>>>>>> properties files to "<CATALINA_BASE>/bin" directory else
>>>>>>> these all wont get added to Tomcat classpath.
>>>>>>
>>>>>> Where does the code live that attempts to load those
>>>>>> properties files?
>>>>>>
>>>>>> - -chris
>>>
>>> . . . just my (I hate moving) 2 cents /mde/
>>
>> Vicky,
>>
>> So let me now understand your requirements.
>>
>> 1. Properties files to be read by web applications
>> 2. 10 web applications on one Tomcat instance
>> 3. All 10 web applications read identical files
>> 4. Property files change frequently
>> 5. $CATALINA_HOME and $CATALINA_BASE are read-only
>> 6. $CATALINA_BASE/lib and $CATALINA_BASE/bin are read-only
>>
>> In the future it would be a good idea to list all of your requirements and restrictions at once, rather than having the list extract it by recommending solutions which fail one or more requirements.
>>
>> The approach (placing resource files on the CLASSPATH) is probably not a good one given the requirements as you've stated them.
>>
>> If you're wedded to reading resources from a CLASSPATH, the only reasonable way to live with the above requirements is to use files in WEB-INF/classes. Then the application will have to be changed each time you update the resource files. This all can be scripted so that operations won't have too big of a burden.
>>
>> Placing the resources in a JAR somewhere on Tomcat's CLASSPATH poses several problems.
>>
>> 1. You cannot modify the directories where Tomcat reads JARs
>> 2. A change to the resource will require a Tomcat restart
>>
>> One of the only ways I can see around this is as follows.
>>
>> 1. create a setenv.sh in $CATALINA_BASE/bin (or setenv.bat)
>>
>> I realize you do not have write access to this, but maybe operations can create that file.
>>
>> 2. In that setenv.sh, add the following:
>>
>> CLASSPATH=/place/where/your/jar/is.jar
>> EXPORT CLASSPATH
>>
>> 3. Make the /place/where/your/jar/is.jar readable
>>
>> This JAR file must be readable by the user running Tomcat
>>
>> 4. In is.jar add all your configuration files
>>
>> This is a pretty spectacularly bad solution for several reasons.
>>
>> 1. You're reading a file outside of Tomcat's directory structure
>> 2. Eunning under the security manager would be challenging
>> 3. Tomcat restart for changing the JAR with the properties files
>>
>> At this point, I would seriously look at scripting the 10 web application updates, or loading the properties files in a database and access them via JNDI.
>>
>> . . . . just my two cents.
>> /mde/
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>
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Re: Tomcat 6.0 CLASSPATH query
Posted by vi...@yahoo.co.in.
Thanks Mark
Sorry for the confusion i created related to my requirements.
5 Out of 6 requirements you stated below are correct. The last point i.e $CATALINA_BASE is writable. I can manipulate/write files to this location.
So now do you have anything more to add to your proposed solution as you suggested below
Thanks,
Vicky
On Dec 9, 2012, at 2:09 AM, Mark Eggers <it...@yahoo.com> wrote:
> See at the end for a truly spectacularly bad potential solution. Note that I have not tried this, so your mileage may vary.
>
> On 12/8/2012 11:51 AM, vicky wrote:
>> Thanks Mark for your valuable suggestions.
>>
>> But in my project i have a requirement to share one
>> "resource/properties file " across 10 applications deployed on single
>> tomcat instance
>>
>> We cannot afford to add the same properties file to all archives as
>> its contents keep changing.
>>
>> Another restriction which i have is that i cannot place any file
>> under "$CATALINA_HOME" directories , these are read only for us.
>>
>> Based on afore said concerns, do you have any better way out ..please
>> suggest.
>>
>> Appreciated all of your help
>>
>> Thanks for ur time Vicky
>>
>>
>> ________________________________ From: Mark Eggers
>> <it...@yahoo.com> To: Tomcat Users List
>> <us...@tomcat.apache.org> Sent: Sunday, 9 December 2012 12:23 AM
>> Subject: Re: Tomcat 6.0 CLASSPATH query
>>
>> Comments inline below (a bit fuzzy from the move yet).
>>
>> On 12/8/2012 9:58 AM, vicky wrote:
>>>
>>> I have read the Tomcat 6.0 classloader documentation(below link),
>>> from this what i understood is that the
>>> "classes/jar/resource/properties file" get loaded from the
>>> following locations
>>>
>>> 1.Bootstrap classes of your JVM ($JAVA_HOME/jre/lib/ext).
>>> 2.System class loader classes ( Add bootstrap.jar &
>>> tomcat-juli.jar to CLASSPATH variable) 3.Common class loader
>>> classes ( refers $CATALINA_BASE/lib & $CATALINA_HOME/lib ) & uses
>>> $CATALINA_BASE/conf/catalina.properties 4. /WEB-INF/classes of
>>> your web application 5. /WEB-INF/lib/*.jar of your web application
>>>
>>> The thing which is still puzzling me is that how my
>>> "resource/properties files" get loaded to Tomcat CLASSPATH when i
>>> add them to "$CATALINA_BASE/bin" directory & When i move the same
>>> files to $CATALINA_BASE/conf directory then it doesn't get added to
>>> Tomcat CLASSPATH.
>>>
>>> My deployed applications need"properties/resource files ", Can
>>> someone please help me in understand the optimal way of adding
>>> these files to Tomcat CLASSPATH. Does placing the files under
>>> <CATALINA_BASE>/bin is the right approach.Please suggest
>>
>> Why in the world are you adding these resource files to Tomcat's
>> CLASSPATH? If the resources are application - specific, you don't
>> need to do this at all.
>>
>> Just add the files to your local application. In Maven, there's a
>> special directory for that:
>>
>> src/main/resources
>>
>> In NetBeans, I normally create a separate package for all of my
>> configuration files.
>>
>> I think in Eclipse you'll have to make a subdirectory under
>> WEB-INF/classes and copy the files there. That's unpleasant. Eclipse
>> will include that in the build of the WAR file when you do an
>> "export".
>>
>> Then, just do the following in your code to reference the resource.
>>
>> InputStream in =
>> this.getClass().getClassLoader().getResourceAsStream(configfile);
>>
>> Where configfile is the complete classpath to your resource.
>>
>> This is nice. It works in exploded WARs, it works in WAR files, it
>> works in JARs.
>>
>> No mucking about with CLASSPATH. No polluting other applications or
>> Tomcat with spurious application - specific resources. This enables
>> you to run several copies of the same web application in the same
>> container, all with different configurations.
>>
>> Just search for getResourceAsStream() for more explanation.
>>
>>> In my organisation i cannot add anything to "$CATALINA_HOME/lib or
>>> bin" location ,these are read only directories
>>>
>>> http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html
>>> Thanks for your help Vicky
>>
>> Not needed.
>>
>>>
>>>
>>> ________________________________ From: Pid * <pi...@pidster.com> To:
>>> Tomcat Users List <us...@tomcat.apache.org> Sent: Saturday, 8
>>> December 2012 10:34 PM Subject: Re: Tomcat 6.0 CLASSPATH query
>>>
>>> On 8 Dec 2012, at 03:29, "vicky007aggarwal@yahoo.co.in"
>>> <vi...@yahoo.co.in> wrote:
>>>
>>>> Application is deployed under tomcat webapps directory . It
>>>> tries to refer to application specific properties file from
>>>> tomcat classpath, for that we copied it under tomcat bin
>>>> directory.
>>>>
>>>> My query is that does this is the right way to add properties
>>>> file to tomcat classpath?
>>>
>>> Did you try putting it in tomcat/lib?
>>>
>>>
>>> p
>>
>>>
>>>
>>>
>>>>
>>>> Thanks for ur help, Vicky
>>>>
>>>>
>>>>
>>>> On Dec 8, 2012, at 2:11 AM, Christopher Schultz
>>>> <ch...@christopherschultz.net> wrote:
>>>>
>>>>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
>>>>>
>>>>> Vicky,
>>>>>
>>>>> On 12/7/12 11:48 AM, vicky wrote:
>>>>>> I have a requirement in which i need to add couple of
>>>>>> properties files to tomcat CLASSPATH as these are needed for
>>>>>> my application deployed in Tomcat 6.0.
>>>>>>
>>>>>> One strange thing is that, i need to add the all my
>>>>>> properties files to "<CATALINA_BASE>/bin" directory else
>>>>>> these all wont get added to Tomcat classpath.
>>>>>
>>>>> Where does the code live that attempts to load those
>>>>> properties files?
>>>>>
>>>>> - -chris
>>
>> . . . just my (I hate moving) 2 cents /mde/
>
> Vicky,
>
> So let me now understand your requirements.
>
> 1. Properties files to be read by web applications
> 2. 10 web applications on one Tomcat instance
> 3. All 10 web applications read identical files
> 4. Property files change frequently
> 5. $CATALINA_HOME and $CATALINA_BASE are read-only
> 6. $CATALINA_BASE/lib and $CATALINA_BASE/bin are read-only
>
> In the future it would be a good idea to list all of your requirements and restrictions at once, rather than having the list extract it by recommending solutions which fail one or more requirements.
>
> The approach (placing resource files on the CLASSPATH) is probably not a good one given the requirements as you've stated them.
>
> If you're wedded to reading resources from a CLASSPATH, the only reasonable way to live with the above requirements is to use files in WEB-INF/classes. Then the application will have to be changed each time you update the resource files. This all can be scripted so that operations won't have too big of a burden.
>
> Placing the resources in a JAR somewhere on Tomcat's CLASSPATH poses several problems.
>
> 1. You cannot modify the directories where Tomcat reads JARs
> 2. A change to the resource will require a Tomcat restart
>
> One of the only ways I can see around this is as follows.
>
> 1. create a setenv.sh in $CATALINA_BASE/bin (or setenv.bat)
>
> I realize you do not have write access to this, but maybe operations can create that file.
>
> 2. In that setenv.sh, add the following:
>
> CLASSPATH=/place/where/your/jar/is.jar
> EXPORT CLASSPATH
>
> 3. Make the /place/where/your/jar/is.jar readable
>
> This JAR file must be readable by the user running Tomcat
>
> 4. In is.jar add all your configuration files
>
> This is a pretty spectacularly bad solution for several reasons.
>
> 1. You're reading a file outside of Tomcat's directory structure
> 2. Eunning under the security manager would be challenging
> 3. Tomcat restart for changing the JAR with the properties files
>
> At this point, I would seriously look at scripting the 10 web application updates, or loading the properties files in a database and access them via JNDI.
>
> . . . . just my two cents.
> /mde/
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
---------------------------------------------------------------------
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Re: Tomcat 6.0 CLASSPATH query
Posted by Mark Eggers <it...@yahoo.com>.
See at the end for a truly spectacularly bad potential solution. Note
that I have not tried this, so your mileage may vary.
On 12/8/2012 11:51 AM, vicky wrote:
> Thanks Mark for your valuable suggestions.
>
> But in my project i have a requirement to share one
> "resource/properties file " across 10 applications deployed on single
> tomcat instance
>
> We cannot afford to add the same properties file to all archives as
> its contents keep changing.
>
> Another restriction which i have is that i cannot place any file
> under "$CATALINA_HOME" directories , these are read only for us.
>
> Based on afore said concerns, do you have any better way out ..please
> suggest.
>
> Appreciated all of your help
>
> Thanks for ur time Vicky
>
>
> ________________________________ From: Mark Eggers
> <it...@yahoo.com> To: Tomcat Users List
> <us...@tomcat.apache.org> Sent: Sunday, 9 December 2012 12:23 AM
> Subject: Re: Tomcat 6.0 CLASSPATH query
>
> Comments inline below (a bit fuzzy from the move yet).
>
> On 12/8/2012 9:58 AM, vicky wrote:
>>
>> I have read the Tomcat 6.0 classloader documentation(below link),
>> from this what i understood is that the
>> "classes/jar/resource/properties file" get loaded from the
>> following locations
>>
>> 1.Bootstrap classes of your JVM ($JAVA_HOME/jre/lib/ext).
>> 2.System class loader classes ( Add bootstrap.jar &
>> tomcat-juli.jar to CLASSPATH variable) 3.Common class loader
>> classes ( refers $CATALINA_BASE/lib & $CATALINA_HOME/lib ) & uses
>> $CATALINA_BASE/conf/catalina.properties 4. /WEB-INF/classes of
>> your web application 5. /WEB-INF/lib/*.jar of your web application
>>
>> The thing which is still puzzling me is that how my
>> "resource/properties files" get loaded to Tomcat CLASSPATH when i
>> add them to "$CATALINA_BASE/bin" directory & When i move the same
>> files to $CATALINA_BASE/conf directory then it doesn't get added to
>> Tomcat CLASSPATH.
>>
>> My deployed applications need"properties/resource files ", Can
>> someone please help me in understand the optimal way of adding
>> these files to Tomcat CLASSPATH. Does placing the files under
>> <CATALINA_BASE>/bin is the right approach.Please suggest
>>
>
> Why in the world are you adding these resource files to Tomcat's
> CLASSPATH? If the resources are application - specific, you don't
> need to do this at all.
>
> Just add the files to your local application. In Maven, there's a
> special directory for that:
>
> src/main/resources
>
> In NetBeans, I normally create a separate package for all of my
> configuration files.
>
> I think in Eclipse you'll have to make a subdirectory under
> WEB-INF/classes and copy the files there. That's unpleasant. Eclipse
> will include that in the build of the WAR file when you do an
> "export".
>
> Then, just do the following in your code to reference the resource.
>
> InputStream in =
> this.getClass().getClassLoader().getResourceAsStream(configfile);
>
> Where configfile is the complete classpath to your resource.
>
> This is nice. It works in exploded WARs, it works in WAR files, it
> works in JARs.
>
> No mucking about with CLASSPATH. No polluting other applications or
> Tomcat with spurious application - specific resources. This enables
> you to run several copies of the same web application in the same
> container, all with different configurations.
>
> Just search for getResourceAsStream() for more explanation.
>
>> In my organisation i cannot add anything to "$CATALINA_HOME/lib or
>> bin" location ,these are read only directories
>>
>> http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html
>> Thanks for your help Vicky
>
> Not needed.
>
>>
>>
>> ________________________________ From: Pid * <pi...@pidster.com> To:
>> Tomcat Users List <us...@tomcat.apache.org> Sent: Saturday, 8
>> December 2012 10:34 PM Subject: Re: Tomcat 6.0 CLASSPATH query
>>
>> On 8 Dec 2012, at 03:29, "vicky007aggarwal@yahoo.co.in"
>> <vi...@yahoo.co.in> wrote:
>>
>>> Application is deployed under tomcat webapps directory . It
>>> tries to refer to application specific properties file from
>>> tomcat classpath, for that we copied it under tomcat bin
>>> directory.
>>>
>>> My query is that does this is the right way to add properties
>>> file to tomcat classpath?
>>
>> Did you try putting it in tomcat/lib?
>>
>>
>> p
>
>>
>>
>>
>>>
>>> Thanks for ur help, Vicky
>>>
>>>
>>>
>>> On Dec 8, 2012, at 2:11 AM, Christopher Schultz
>>> <ch...@christopherschultz.net> wrote:
>>>
>>>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
>>>>
>>>> Vicky,
>>>>
>>>> On 12/7/12 11:48 AM, vicky wrote:
>>>>> I have a requirement in which i need to add couple of
>>>>> properties files to tomcat CLASSPATH as these are needed for
>>>>> my application deployed in Tomcat 6.0.
>>>>>
>>>>> One strange thing is that, i need to add the all my
>>>>> properties files to "<CATALINA_BASE>/bin" directory else
>>>>> these all wont get added to Tomcat classpath.
>>>>
>>>> Where does the code live that attempts to load those
>>>> properties files?
>>>>
>>>> - -chris
>
> . . . just my (I hate moving) 2 cents /mde/
Vicky,
So let me now understand your requirements.
1. Properties files to be read by web applications
2. 10 web applications on one Tomcat instance
3. All 10 web applications read identical files
4. Property files change frequently
5. $CATALINA_HOME and $CATALINA_BASE are read-only
6. $CATALINA_BASE/lib and $CATALINA_BASE/bin are read-only
In the future it would be a good idea to list all of your requirements
and restrictions at once, rather than having the list extract it by
recommending solutions which fail one or more requirements.
The approach (placing resource files on the CLASSPATH) is probably not a
good one given the requirements as you've stated them.
If you're wedded to reading resources from a CLASSPATH, the only
reasonable way to live with the above requirements is to use files in
WEB-INF/classes. Then the application will have to be changed each time
you update the resource files. This all can be scripted so that
operations won't have too big of a burden.
Placing the resources in a JAR somewhere on Tomcat's CLASSPATH poses
several problems.
1. You cannot modify the directories where Tomcat reads JARs
2. A change to the resource will require a Tomcat restart
One of the only ways I can see around this is as follows.
1. create a setenv.sh in $CATALINA_BASE/bin (or setenv.bat)
I realize you do not have write access to this, but maybe operations can
create that file.
2. In that setenv.sh, add the following:
CLASSPATH=/place/where/your/jar/is.jar
EXPORT CLASSPATH
3. Make the /place/where/your/jar/is.jar readable
This JAR file must be readable by the user running Tomcat
4. In is.jar add all your configuration files
This is a pretty spectacularly bad solution for several reasons.
1. You're reading a file outside of Tomcat's directory structure
2. Eunning under the security manager would be challenging
3. Tomcat restart for changing the JAR with the properties files
At this point, I would seriously look at scripting the 10 web
application updates, or loading the properties files in a database and
access them via JNDI.
. . . . just my two cents.
/mde/
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Re: Tomcat 6.0 CLASSPATH query
Posted by vicky <vi...@yahoo.co.in>.
Thanks Mark for your valuable suggestions.
But in my project i have a requirement to share one "resource/properties file " across 10 applications deployed on single tomcat instance
We cannot afford to add the same properties file to all archives as its contents keep changing.
Another restriction which i have is that i cannot place any file under "$CATALINA_HOME" directories , these are read only for us.
Based on afore said concerns, do you have any better way out ..please suggest.
Appreciated all of your help
Thanks for ur time
Vicky
________________________________
From: Mark Eggers <it...@yahoo.com>
To: Tomcat Users List <us...@tomcat.apache.org>
Sent: Sunday, 9 December 2012 12:23 AM
Subject: Re: Tomcat 6.0 CLASSPATH query
Comments inline below (a bit fuzzy from the move yet).
On 12/8/2012 9:58 AM, vicky wrote:
>
> I have read the Tomcat 6.0 classloader documentation(below link),
> from this what i understood is that the
> "classes/jar/resource/properties file" get loaded from the following
> locations
>
> 1.Bootstrap classes of your JVM ($JAVA_HOME/jre/lib/ext). 2.System
> class loader classes ( Add bootstrap.jar & tomcat-juli.jar to
> CLASSPATH variable) 3.Common class loader classes ( refers
> $CATALINA_BASE/lib & $CATALINA_HOME/lib ) & uses
> $CATALINA_BASE/conf/catalina.properties 4. /WEB-INF/classes of your
> web application 5. /WEB-INF/lib/*.jar of your web application
>
> The thing which is still puzzling me is that how my
> "resource/properties files" get loaded to Tomcat CLASSPATH when i add
> them to "$CATALINA_BASE/bin" directory & When i move the same files
> to $CATALINA_BASE/conf directory then it doesn't get added to Tomcat
> CLASSPATH.
>
> My deployed applications need"properties/resource files ", Can
> someone please help me in understand the optimal way of adding these
> files to Tomcat CLASSPATH. Does placing the files under
> <CATALINA_BASE>/bin is the right approach.Please suggest
>
Why in the world are you adding these resource files to Tomcat's
CLASSPATH? If the resources are application - specific, you don't need
to do this at all.
Just add the files to your local application. In Maven, there's a
special directory for that:
src/main/resources
In NetBeans, I normally create a separate package for all of my
configuration files.
I think in Eclipse you'll have to make a subdirectory under
WEB-INF/classes and copy the files there. That's unpleasant. Eclipse
will include that in the build of the WAR file when you do an "export".
Then, just do the following in your code to reference the resource.
InputStream in =
this.getClass().getClassLoader().getResourceAsStream(configfile);
Where configfile is the complete classpath to your resource.
This is nice. It works in exploded WARs, it works in WAR files, it works
in JARs.
No mucking about with CLASSPATH. No polluting other applications or
Tomcat with spurious application - specific resources. This enables you
to run several copies of the same web application in the same container,
all with different configurations.
Just search for getResourceAsStream() for more explanation.
> In my organisation i cannot add anything to "$CATALINA_HOME/lib or
> bin" location ,these are read only directories
>
> http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html
> Thanks for your help Vicky
Not needed.
>
>
> ________________________________ From: Pid * <pi...@pidster.com> To:
> Tomcat Users List <us...@tomcat.apache.org> Sent: Saturday, 8
> December 2012 10:34 PM Subject: Re: Tomcat 6.0 CLASSPATH query
>
> On 8 Dec 2012, at 03:29, "vicky007aggarwal@yahoo.co.in"
> <vi...@yahoo.co.in> wrote:
>
>> Application is deployed under tomcat webapps directory . It tries
>> to refer to application specific properties file from tomcat
>> classpath, for that we copied it under tomcat bin directory.
>>
>> My query is that does this is the right way to add properties file
>> to tomcat classpath?
>
> Did you try putting it in tomcat/lib?
>
>
> p
>
>
>
>>
>> Thanks for ur help, Vicky
>>
>>
>>
>> On Dec 8, 2012, at 2:11 AM, Christopher Schultz
>> <ch...@christopherschultz.net> wrote:
>>
>>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
>>>
>>> Vicky,
>>>
>>> On 12/7/12 11:48 AM, vicky wrote:
>>>> I have a requirement in which i need to add couple of
>>>> properties files to tomcat CLASSPATH as these are needed for my
>>>> application deployed in Tomcat 6.0.
>>>>
>>>> One strange thing is that, i need to add the all my properties
>>>> files to "<CATALINA_BASE>/bin" directory else these all wont
>>>> get added to Tomcat classpath.
>>>
>>> Where does the code live that attempts to load those properties
>>> files?
>>>
>>> - -chris
. . . just my (I hate moving) 2 cents
/mde/
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Re: Tomcat 6.0 CLASSPATH query
Posted by Mark Eggers <it...@yahoo.com>.
Comments inline below (a bit fuzzy from the move yet).
On 12/8/2012 9:58 AM, vicky wrote:
>
> I have read the Tomcat 6.0 classloader documentation(below link),
> from this what i understood is that the
> "classes/jar/resource/properties file" get loaded from the following
> locations
>
> 1.Bootstrap classes of your JVM ($JAVA_HOME/jre/lib/ext). 2.System
> class loader classes ( Add bootstrap.jar & tomcat-juli.jar to
> CLASSPATH variable) 3.Common class loader classes ( refers
> $CATALINA_BASE/lib & $CATALINA_HOME/lib ) & uses
> $CATALINA_BASE/conf/catalina.properties 4. /WEB-INF/classes of your
> web application 5. /WEB-INF/lib/*.jar of your web application
>
> The thing which is still puzzling me is that how my
> "resource/properties files" get loaded to Tomcat CLASSPATH when i add
> them to "$CATALINA_BASE/bin" directory & When i move the same files
> to $CATALINA_BASE/conf directory then it doesn't get added to Tomcat
> CLASSPATH.
>
> My deployed applications need"properties/resource files ", Can
> someone please help me in understand the optimal way of adding these
> files to Tomcat CLASSPATH. Does placing the files under
> <CATALINA_BASE>/bin is the right approach.Please suggest
>
Why in the world are you adding these resource files to Tomcat's
CLASSPATH? If the resources are application - specific, you don't need
to do this at all.
Just add the files to your local application. In Maven, there's a
special directory for that:
src/main/resources
In NetBeans, I normally create a separate package for all of my
configuration files.
I think in Eclipse you'll have to make a subdirectory under
WEB-INF/classes and copy the files there. That's unpleasant. Eclipse
will include that in the build of the WAR file when you do an "export".
Then, just do the following in your code to reference the resource.
InputStream in =
this.getClass().getClassLoader().getResourceAsStream(configfile);
Where configfile is the complete classpath to your resource.
This is nice. It works in exploded WARs, it works in WAR files, it works
in JARs.
No mucking about with CLASSPATH. No polluting other applications or
Tomcat with spurious application - specific resources. This enables you
to run several copies of the same web application in the same container,
all with different configurations.
Just search for getResourceAsStream() for more explanation.
> In my organisation i cannot add anything to "$CATALINA_HOME/lib or
> bin" location ,these are read only directories
>
> http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html
> Thanks for your help Vicky
Not needed.
>
>
> ________________________________ From: Pid * <pi...@pidster.com> To:
> Tomcat Users List <us...@tomcat.apache.org> Sent: Saturday, 8
> December 2012 10:34 PM Subject: Re: Tomcat 6.0 CLASSPATH query
>
> On 8 Dec 2012, at 03:29, "vicky007aggarwal@yahoo.co.in"
> <vi...@yahoo.co.in> wrote:
>
>> Application is deployed under tomcat webapps directory . It tries
>> to refer to application specific properties file from tomcat
>> classpath, for that we copied it under tomcat bin directory.
>>
>> My query is that does this is the right way to add properties file
>> to tomcat classpath?
>
> Did you try putting it in tomcat/lib?
>
>
> p
>
>
>
>>
>> Thanks for ur help, Vicky
>>
>>
>>
>> On Dec 8, 2012, at 2:11 AM, Christopher Schultz
>> <ch...@christopherschultz.net> wrote:
>>
>>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
>>>
>>> Vicky,
>>>
>>> On 12/7/12 11:48 AM, vicky wrote:
>>>> I have a requirement in which i need to add couple of
>>>> properties files to tomcat CLASSPATH as these are needed for my
>>>> application deployed in Tomcat 6.0.
>>>>
>>>> One strange thing is that, i need to add the all my properties
>>>> files to "<CATALINA_BASE>/bin" directory else these all wont
>>>> get added to Tomcat classpath.
>>>
>>> Where does the code live that attempts to load those properties
>>> files?
>>>
>>> - -chris
. . . just my (I hate moving) 2 cents
/mde/
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Re: Tomcat 6.0 CLASSPATH query
Posted by vicky <vi...@yahoo.co.in>.
I have read the Tomcat 6.0 classloader documentation(below link), from this what i understood is that the "classes/jar/resource/properties file"
get loaded from the following locations
1.Bootstrap classes of your JVM ($JAVA_HOME/jre/lib/ext).
2.System class loader classes ( Add bootstrap.jar & tomcat-juli.jar to CLASSPATH variable)
3.Common class loader classes ( refers $CATALINA_BASE/lib & $CATALINA_HOME/lib ) & uses $CATALINA_BASE/conf/catalina.properties
4. /WEB-INF/classes of your web application
5. /WEB-INF/lib/*.jar of your web application
The thing which is still puzzling me is that how my "resource/properties files" get loaded to Tomcat CLASSPATH
when i add them to "$CATALINA_BASE/bin" directory & When i move the same files to $CATALINA_BASE/conf directory then it doesn't get added to Tomcat CLASSPATH.
My deployed applications need"properties/resource files ", Can someone please help me in understand the optimal way of adding these files to
Tomcat CLASSPATH. Does placing the files under <CATALINA_BASE>/bin is the right approach.Please suggest
In my organisation i cannot add anything to "$CATALINA_HOME/lib or bin" location ,these are read only directories
http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html
Thanks for your help
Vicky
________________________________
From: Pid * <pi...@pidster.com>
To: Tomcat Users List <us...@tomcat.apache.org>
Sent: Saturday, 8 December 2012 10:34 PM
Subject: Re: Tomcat 6.0 CLASSPATH query
On 8 Dec 2012, at 03:29, "vicky007aggarwal@yahoo.co.in"
<vi...@yahoo.co.in> wrote:
> Application is deployed under tomcat webapps directory . It tries to refer to application specific properties file from tomcat classpath, for that we copied it under tomcat bin directory.
>
> My query is that does this is the right way to add properties file to tomcat classpath?
Did you try putting it in tomcat/lib?
p
>
> Thanks for ur help,
> Vicky
>
>
>
> On Dec 8, 2012, at 2:11 AM, Christopher Schultz <ch...@christopherschultz.net> wrote:
>
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA256
>>
>> Vicky,
>>
>> On 12/7/12 11:48 AM, vicky wrote:
>>> I have a requirement in which i need to add couple of properties
>>> files to tomcat CLASSPATH as these are needed for my application
>>> deployed in Tomcat 6.0.
>>>
>>> One strange thing is that, i need to add the all my properties
>>> files to "<CATALINA_BASE>/bin" directory else these all wont get
>>> added to Tomcat classpath.
>>
>> Where does the code live that attempts to load those properties files?
>>
>> - -chris
>> -----BEGIN PGP SIGNATURE-----
>> Version: GnuPG/MacGPG2 v2.0.17 (Darwin)
>> Comment: GPGTools - http://gpgtools.org/
>> Comment: Using GnuPG with undefined - http://www.enigmail.net/
>>
>> iEYEAREIAAYFAlDCVJcACgkQ9CaO5/Lv0PBTogCgoXLXbB5jx///m6qC+ZxO0f20
>> xO8An2SZPU8E0LuiPpQRCZPVw8v/T66L
>> =Jmvq
>> -----END PGP SIGNATURE-----
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>
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Re: Tomcat 6.0 CLASSPATH query
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Pid,
On 12/8/12 12:04 PM, Pid * wrote:
> On 8 Dec 2012, at 03:29, "vicky007aggarwal@yahoo.co.in"
> <vi...@yahoo.co.in> wrote:
>
>> Application is deployed under tomcat webapps directory . It tries
>> to refer to application specific properties file from tomcat
>> classpath, for that we copied it under tomcat bin directory.
>>
>> My query is that does this is the right way to add properties
>> file to tomcat classpath?
>
> Did you try putting it in tomcat/lib?
Better yet: did you try putting it in WEB-INF/classes? That's where it
*should* be.
- -chris
-----BEGIN PGP SIGNATURE-----
Version: GnuPG/MacGPG2 v2.0.17 (Darwin)
Comment: GPGTools - http://gpgtools.org
Comment: Using GnuPG with undefined - http://www.enigmail.net/
iEYEAREIAAYFAlDEwd4ACgkQ9CaO5/Lv0PCWDwCgqOtUlVhyWeZMrWqI99GMVpsj
daoAnR6K97x0tjVOm2q1hKAPzcuSFnrP
=I4EZ
-----END PGP SIGNATURE-----
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Re: Tomcat 6.0 CLASSPATH query
Posted by Pid * <pi...@pidster.com>.
On 8 Dec 2012, at 03:29, "vicky007aggarwal@yahoo.co.in"
<vi...@yahoo.co.in> wrote:
> Application is deployed under tomcat webapps directory . It tries to refer to application specific properties file from tomcat classpath, for that we copied it under tomcat bin directory.
>
> My query is that does this is the right way to add properties file to tomcat classpath?
Did you try putting it in tomcat/lib?
p
>
> Thanks for ur help,
> Vicky
>
>
>
> On Dec 8, 2012, at 2:11 AM, Christopher Schultz <ch...@christopherschultz.net> wrote:
>
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA256
>>
>> Vicky,
>>
>> On 12/7/12 11:48 AM, vicky wrote:
>>> I have a requirement in which i need to add couple of properties
>>> files to tomcat CLASSPATH as these are needed for my application
>>> deployed in Tomcat 6.0.
>>>
>>> One strange thing is that, i need to add the all my properties
>>> files to "<CATALINA_BASE>/bin" directory else these all wont get
>>> added to Tomcat classpath.
>>
>> Where does the code live that attempts to load those properties files?
>>
>> - -chris
>> -----BEGIN PGP SIGNATURE-----
>> Version: GnuPG/MacGPG2 v2.0.17 (Darwin)
>> Comment: GPGTools - http://gpgtools.org
>> Comment: Using GnuPG with undefined - http://www.enigmail.net/
>>
>> iEYEAREIAAYFAlDCVJcACgkQ9CaO5/Lv0PBTogCgoXLXbB5jx///m6qC+ZxO0f20
>> xO8An2SZPU8E0LuiPpQRCZPVw8v/T66L
>> =Jmvq
>> -----END PGP SIGNATURE-----
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>
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Re: Tomcat 6.0 CLASSPATH query
Posted by vi...@yahoo.co.in.
Application is deployed under tomcat webapps directory . It tries to refer to application specific properties file from tomcat classpath, for that we copied it under tomcat bin directory.
My query is that does this is the right way to add properties file to tomcat classpath?
Thanks for ur help,
Vicky
On Dec 8, 2012, at 2:11 AM, Christopher Schultz <ch...@christopherschultz.net> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Vicky,
>
> On 12/7/12 11:48 AM, vicky wrote:
>> I have a requirement in which i need to add couple of properties
>> files to tomcat CLASSPATH as these are needed for my application
>> deployed in Tomcat 6.0.
>>
>> One strange thing is that, i need to add the all my properties
>> files to "<CATALINA_BASE>/bin" directory else these all wont get
>> added to Tomcat classpath.
>
> Where does the code live that attempts to load those properties files?
>
> - -chris
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG/MacGPG2 v2.0.17 (Darwin)
> Comment: GPGTools - http://gpgtools.org
> Comment: Using GnuPG with undefined - http://www.enigmail.net/
>
> iEYEAREIAAYFAlDCVJcACgkQ9CaO5/Lv0PBTogCgoXLXbB5jx///m6qC+ZxO0f20
> xO8An2SZPU8E0LuiPpQRCZPVw8v/T66L
> =Jmvq
> -----END PGP SIGNATURE-----
>
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Re: Tomcat 6.0 CLASSPATH query
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Vicky,
On 12/7/12 11:48 AM, vicky wrote:
> I have a requirement in which i need to add couple of properties
> files to tomcat CLASSPATH as these are needed for my application
> deployed in Tomcat 6.0.
>
> One strange thing is that, i need to add the all my properties
> files to "<CATALINA_BASE>/bin" directory else these all wont get
> added to Tomcat classpath.
Where does the code live that attempts to load those properties files?
- -chris
-----BEGIN PGP SIGNATURE-----
Version: GnuPG/MacGPG2 v2.0.17 (Darwin)
Comment: GPGTools - http://gpgtools.org
Comment: Using GnuPG with undefined - http://www.enigmail.net/
iEYEAREIAAYFAlDCVJcACgkQ9CaO5/Lv0PBTogCgoXLXbB5jx///m6qC+ZxO0f20
xO8An2SZPU8E0LuiPpQRCZPVw8v/T66L
=Jmvq
-----END PGP SIGNATURE-----
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