Determining the complete classpath for a web app in Tomcat 5.5

["Rutherford, Michael" <Mi...@cba.com.au>]

I am attempting to find a (preferably simple :-) way to find out the
complete classpath for a web app. 

 

I can use the System property "java.class.path" which returns a list of
the jars and dirs from the system classpath, along with the common lib
and classes and the shared lib and classes. It does not however list the
jars found in the WEB-INF\lib directory.

 

One potential solution would be to deploy all classes/jars to the common
library but that idea gives me hives. Another solution would be to
determine the classes/jars using file scanning which isn't much better.
I don't want to go with a solution that requires separate maintenance to
continue working so I don't want to add a property file or similar.
Overriding the class loaders to provide the required detail is doable
but I don't want to change the underlying Tomcat code (maybe I can use
reflection to access a private variable or something, which is still not
good but is better than changing Tomcat at least).

 

Michael Rutherfurd


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RE: Determining the complete classpath for a web app in Tomcat 5.5

["Caldarale, Charles R" <Ch...@unisys.com>]

> From: Rutherford, Michael [mailto:Michael.Rutherford@cba.com.au] 
> Subject: Determining the complete classpath for a web app in 
> Tomcat 5.5
> 
> I am attempting to find a (preferably simple :-) way to find out the
> complete classpath for a web app. 

Not sure why you want to do this, but in any event, first Read The Fine
Manual:
http://tomcat.apache.org/tomcat-5.5-doc/class-loader-howto.html

If you have access to any Class object for the web app, you can get its
ClassLoader object.  Assuming you're using Tomcat's standard
WebappClassLoader, this is a subclass of URLClassLoader, so it has a
getURLs() method that can be used to retrieve the paths it processes.
You can follow the getParent() chain of class loaders and do the same
thing all the way up to the system class loader.

 - Chuck


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