I am trying to load a class present in a war file in tomcat from a class in a jar in tomcat lib. I am doing this using Class.forname("myclass") but the application is throwing class not found exception. i guess this is because the webapp will have its own class loader. can someone suggest how to fix this
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This is by design - you can't do that. With the hierarchical classloaders that tomcat is using, you don't have a chance to load a class that's contained a webapp from a class loaded from the global classpath unless you build your own classloading mechanism - which I wouldn't recommend.
I'd rather like to know what problem you're trying to solve with this solution attempt. I can't think of any underlying problem where this would be the right solution for.
Olaf Kock
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The solution is not the correct one but the scenario is like this. The common classes which is used by all the war files are placed in tomcat lib and I have a need to get some data inside a class in tomcat lib which is same as done in a class in war file. I do not want to copy paste the same code but instantiate the class inside the war file and get the data – Subhomoy Sikdar Jan 25 '16 at 10:15
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You should use Thread#getContextClassLoader() to instantiate classes that could be a part of your WAR distribution. But check that Tomcat initialises it with the web app classloader.
dzidzitop
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I tried using the webappclassloader for org.apache.catalina but getting a null pointer in .start() method – Subhomoy Sikdar Jan 25 '16 at 10:18
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Don't try to initialise classloaders on your own. Use the one that is already initialised by Tomcat. – dzidzitop Jan 25 '16 at 10:21