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Posted to users@tomcat.apache.org by ti...@centrelink.gov.au on 2008/01/16 04:55:52 UTC

Access a config file located outsite j2ee app [SEC=UNOFFICIAL]

Hi I'm wanting to store a config file for my J2ee app, somewhere on a 
tomcat server possibly inside the
conf/ directory so that I can update this config file without having to 
redeploy the j2ee app every time a change is made.
I've been told I can use JNDI to access this file, but I can't seem to 
find any examples or documentation on how I can do this.
I would appreciate any help, or suggestions.

So far I can access the file with this code:
Hashtable env = new Hashtable();
                                 env.put(Context.INITIAL_CONTEXT_FACTORY, 
"com.sun.jndi.fscontext.RefFSContextFactory");
 
                                 try {
                                                 Context ctx = new 
InitialContext(prop);
 
                                                 // look up context for 
name
                                                 
//env.put(Context.PROVIDER_URL, 
"file:C:\\confluence\\confluence-2.5.1-std\\conf");
                                                 File f = 
(File)ctx.lookup("/confluence/confluence-2.5.1-std/conf/test.txt");
                                catch {...}


My problems are:

1. The commented line 
env.put(Context.PROVIDER_URL, 
"file:C:\\confluence\\confluence-2.5.1-std\\conf");

it says in examples that this should set the dir to look in to the conf 
dir but if i change the lookup value to just test.txt it cannot find it.

2. Can I somehow set the context to look into the conf directory of Tomcat 
without hard coding the path, as the path could change or be different on 
different machines??
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Re: Access a config file located outsite j2ee app [SEC=UNOFFICIAL]

Posted by David Smith <dn...@cornell.edu>.
I tried using relative paths once.  My experience is relative paths 
won't work as the "current directory" is whatever the working directory 
was on tomcat start.  I had to scrap it as it really wasn't consistent 
enough to be usable.  Something to try might be setting this path using:

(inside the Context element for the webapp)
<Environment name="confPath" value="/path/to/conf/file/or/dir"  
type="java.lang.String" override="false"/>

And then call it up in a webapp using a standard JDNI lookup using 
'java:comp/env/confPath':

Context initCtx = new InitialContext();
String confFilePath = (String) initCtx.lookup("java:comp/env/confPath");
// Open the file using standard java.io methods and the path retrieved 
above here

--David

Caldarale, Charles R wrote:
>> From: timothy.fridey@centrelink.gov.au 
>> [mailto:timothy.fridey@centrelink.gov.au] 
>> Subject: Access a config file located outsite j2ee app 
>> [SEC=UNOFFICIAL]
>>
>> 1. The commented line 
>> env.put(Context.PROVIDER_URL, 
>> "file:C:\\confluence\\confluence-2.5.1-std\\conf");
>>     
>
> Not sure this will work (or even if it's a good idea), but you might try
> a relative path with forward slashes (which is what the JVM uses
> internally anyway):
> "file:../conf"
>
> Since Tomcat's normal working directory is bin - at the same directory
> level as conf - this may work.  
>
>   
>> 2. Can I somehow set the context to look into the conf 
>> directory of Tomcat without hard coding the path
>>     
>
> You could set a context parameter or an environment entry:
> http://tomcat.apache.org/tomcat-6.0-doc/config/context.html%20Context%20
> Parameters
> http://tomcat.apache.org/tomcat-6.0-doc/config/context.html%20Environmen
> t%20Entries
> either in the <Context> element or in WEB-INF/web.xml, again using a
> relative path.
>
>  - Chuck
>
>
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> MATERIAL and is thus for use only by the intended recipient. If you
> received this in error, please contact the sender and delete the e-mail
> and its attachments from all computers.
>
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>   


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RE: Access a config file located outsite j2ee app [SEC=UNOFFICIAL]

Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: timothy.fridey@centrelink.gov.au 
> [mailto:timothy.fridey@centrelink.gov.au] 
> Subject: Access a config file located outsite j2ee app 
> [SEC=UNOFFICIAL]
> 
> 1. The commented line 
> env.put(Context.PROVIDER_URL, 
> "file:C:\\confluence\\confluence-2.5.1-std\\conf");

Not sure this will work (or even if it's a good idea), but you might try
a relative path with forward slashes (which is what the JVM uses
internally anyway):
"file:../conf"

Since Tomcat's normal working directory is bin - at the same directory
level as conf - this may work.  

> 2. Can I somehow set the context to look into the conf 
> directory of Tomcat without hard coding the path

You could set a context parameter or an environment entry:
http://tomcat.apache.org/tomcat-6.0-doc/config/context.html%20Context%20
Parameters
http://tomcat.apache.org/tomcat-6.0-doc/config/context.html%20Environmen
t%20Entries
either in the <Context> element or in WEB-INF/web.xml, again using a
relative path.

 - Chuck


THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
MATERIAL and is thus for use only by the intended recipient. If you
received this in error, please contact the sender and delete the e-mail
and its attachments from all computers.

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