Why does ClassNotFoundException occur while accessing EJB through Proxy object?

Issue

• We are performing migration from community JBoss AS 5.1.0 GA to EAP JBoss EAP 5.2.0. In our application, we have an applet application TEST which get connected to our application.

• While doing some transaction activity we faced below mentioned exception in server.log;

 Exception :ServiceHandlerServlet2 :callEJB :
com.sun.proxy.$Proxy8471 from BaseClassLoader@691d75c0{vfsfile:/data/jboss-eap-5.2/jboss-as/server/default/deploy/myApp.ear/}
2015-03-25 15:38:35,831 ERROR [STDERR] (http-0.0.0.0-80-1) java.lang.ClassNotFoundException: com.sun.proxy.$Proxy8471 from BaseClassLoader@691d75c0{vfsfile:/data/jboss-eap-5.2/jboss-as/server/default/deploy/myApp.ear/}

• Below is our code snippet which is being used to access EJB classes by using Proxy.

String lookUpName = "someLookUpName";
ActionHandlerRemote actionHandlerComp = (ActionHandlerRemote)ctx.lookup(lookUpName); //Some base class to get class details using lookup object
classObj = Class.forName(actionHandlerComp.getClass().getName()); // Trying to access EJB using proxy component created via lookup

• Following exception will be thrown while EJB components will be accessed via Proxy object.

2015-03-25 15:38:35,831 ERROR [STDERR] (http-0.0.0.0-80-1) java.lang.ClassNotFoundException: com.sun.proxy.$Proxy8471 from BaseClassLoader@691d75c0{vfsfile:/data/jboss-eap-5.2/jboss-as/server/default/deploy/myApp.ear/}
2015-03-25 15:38:35,831 ERROR [STDERR] (http-0.0.0.0-80-1)  at org.jboss.classloader.spi.base.BaseClassLoader.loadClass(BaseClassLoader.java:481)
2015-03-25 15:38:35,831 ERROR [STDERR] (http-0.0.0.0-80-1)  at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
2015-03-25 15:38:35,832 ERROR [STDERR] (http-0.0.0.0-80-1)  at java.lang.Class.forName0(Native Method)
2015-03-25 15:38:35,832 ERROR [STDERR] (http-0.0.0.0-80-1)  at java.lang.Class.forName(Class.java:171)