Re: ${user.home} and other server.xml tags accepted by Tomcat?

[pzwedhhs <pz...@guerrillamailblock.com>]

I have successfully managed to set a (not predefined) variable in
catalina.properties by adding the line dbconf=mydb. When I call
System.getProperties in the code of the web application, this variable
appears.
However, I would like to access this variable in context.xml inside the web
application. More precisely, it should be used in the definition of a Realm,
such as

<Realm className="org.apache.catalina.realm.JDBCRealm" 
                driverName="org.postgresql.Driver" 
                connectionURL="jdbc:postgresql://myserver:5432/${dbconf}" 
                connectionName="xxx" connectionPassword="yyy" 
                userTable="users" userRoleTable="roles" 
                userNameCol="name" userCredCol="pw" roleNameCol="role" 
                digest="MD5" />

The syntax ${dbconf}, which I found in several forums on the net, did not
work. Any hint?


Bill Barker-2 wrote:
> 
> As Konstantin has already pointed out, any value that you can get from 
> System.getProperty("...") will be used for substitution.  And to expand on 
> Rainer's comment, these are available for substitution in web.xml as well. 
> This is a Tomcat-specific feature, so limits your ability to port to other 
> containers.  There is currently no support for ${ENV.xxx},  it needs to be
> a 
> Java property, not just an env variable.
> 
> 
> "Maxim Veksler" <ma...@gmail.com> wrote in message 
> news:b400c69a0809280848k4c588fa5v9353cfe1819f9bd1@mail.gmail.com...
>> On Sun, Sep 28, 2008 at 2:37 PM, Rainer Jung <ra...@kippdata.de> 
>> wrote:
>>> Maxim Veksler schrieb:
>>>> Hello list,
>>>>
>>>> I'm looking for a way to make my tomcat configuration more dynamic
>>>> without resorting to editing xm files. I considering doing this by
>>>> using parameter substitution.
>>>> I've seen from the SSL guide that tomcat will accept configurations
>>>> like """${user.home}""".
>>>>
>>>> Is there a list, or a known set of these options that tomcat will
>>>> read? Getting at least a reference to the cataline_home will be very
>>>> helpful.
>>>>
>>>>
>>>> p.s.
>>>> I know from ant files that you can do ${env.SOMEVAL} to get the
>>>> environment, sadly this does not work here. Is there an equivalent
>>>> alternative ?
>>>
>>> The answer depends on the exact version you are using. All version 5.5
>>> and 6 Tomcats and recent version 4.1 Tomcat supports resolving
>>> ${somevariable} in server.xml by looking at system properties 
>>> automatically.
>>>
>>> Some properties are set during Tomcat startup, like catalina.home and
>>> catalina.base. Others you can set yourself by either adding to the
>>> commandline "-Dsomevariable=somevalue" or adding to the end of
>>> conf/catalina.properties.
>>>
>>> Not all config files aloow this. I think catalina.properties itself does
>>> only allow for catalina.home and catalina.base and not general system
>>> properties, log4j.properties allows general system properties, I'm not
>>> sure about context.xml and web.xml at the moment (you could try).
>>>
>>> Be careful: system properties work, environment variables not. System
>>> properties are often seen as a java equivalent of environment variables,
>>> although those exist in java too.
>>>
>>> A common practise in a farms would be, to determine parts of the ports
>>> to bind to in a startup script and to set them in server.xml by using
>>> system properties, so the server.xml file in the whole farm can be kept
>>> identical.
>>>
>>
>> Hello Rainer,
>>
>> Thank you for the excellent pointers.
>>
>>
>> Are you perhaps familiar with a programmatic / configurable method to
>> output putting the full list of properties recognized by tomcat during
>> Catalina start up ?
>>
>>
>> Thank you,
>> Maxim.
>>
>>> Regards,
>>>
>>> Rainer
>>>
>>> ---------------------------------------------------------------------
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>>>
>>>
>>
>>
>>
>> -- 
>> Cheers,
>> Maxim Veksler
>>
>> "Free as in Freedom" - Do u GNU ?
>>
>> ---------------------------------------------------------------------
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>>
>> 
> 
> 
> 
> 
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