Migrating an EJB project running on JBoss to Websphere Applicataion Server 7

I have a Java EJB project 开发者_运维百科running on JBoss properly.However I have to migrate it to WAS. So I created an EAR then deployed it to WAS. After I tried to run this project on WAS i get this error:

Error 500: javassist.util.proxy.MethodHandler, [Servlet Error]-[javassist.util.proxy.MethodHandler]: java.lang.NoClassDefFoundError: javassist.util.proxy.MethodHandler

How can I fix this error and run this project on WAS?

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It seems you use classes in your application not available on WebSphere, but on JBoss (namely javassist). Get the JAR containing those classes and add it to the EAR.

This is a common Java issue and not related to any application server, NoClassDefFoundError. You must get all classes your application requires during runtime.

Edit: javassist information is available here. Depending on your JBoss and WAS versions you must choose the right version.