Why do I get ClassCastExceptions and/or NoClassDefFoundExceptions while deploying my application under JBoss Application Server?
It depends on the JBoss Application Server classpath and ClassLoader, anyway the workaround is to ensure there is no library version collision in your project. A library version collision happens whenever you have into your project a dependancy from a library already present into the JBoss main libraries (those into the root lib folder or into the server/xxx/lib folder) which differs from your own by version (it doesn’t matter the name of the file!!!). In this case you have no choice other than removing the library from your own project and try to use the classes already loaded by the JBoss root ClassLoader: if the library doesn’t work you can always try to replace the JBoss one with your at your own risk! We often succedeed in this activity, but sometimes it fails, depending by the library and the JBoss version you are using…
