Hi, I am new to JBoss. I have just installed (Jboss and Tomcat) and started working on the Interest Example given in the "7: compiling the test client as a servlet " of Documentation. When i invoked the servlet "http://localhost:8080/examples/servlet/EJB" i am receiving the following error message No 1(given below). Surprisingly when i presses Refresh of the Browser, i got another error message No2(given below) . Can you please suggest where i went wrong and why pressing Refresh button producing different error message? How to configure/program so that servlet can access the EJB? Thanks in advance, satya Error Message 1: ------------------------------------------------------------------------------------------- javax.naming.CommunicationException. Root exception is java.io.InvalidClassException: org.jboss.ejb.plugins.jrmp.interfaces.GenericProxy; Local class not compatible: stream classdesc serialVersionUID=7822409041172562877 local class serialVersionUID=0 at java.io.ObjectStreamClass.validateLocalClass(ObjectStreamClass.java:523) at java.io.ObjectStreamClass.setClass(ObjectStreamClass.java:567) at java.io.ObjectInputStream.inputClassDescriptor(ObjectInputStream.java:936) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:366) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236) at java.io.ObjectInputStream.inputClassDescriptor(ObjectInputStream.java:940) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:366) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236) at java.io.ObjectInputStream.inputClassDescriptor(ObjectInputStream.java:940) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:366) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236) at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1186) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386) at java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2262) at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:519) at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1411) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236) at java.rmi.MarshalledObject.get(MarshalledObject.java:138) at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:299) at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:279) at javax.naming.InitialContext.lookup(InitialContext.java:350) at EJB.doGet(EJB.java:86) at javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404) at org.apache.tomcat.core.Handler.service(Handler.java:286) at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372) at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:799) at org.apache.tomcat.core.ContextManager.service(ContextManager.java:745) at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210) at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:407) at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498) at java.lang.Thread.run(Thread.java:484) Error message 2 --------------------------------------------------------------------------------------- Error: 500 Location: /examples/servlet/EJB Internal Servlet Error: java.lang.NoClassDefFoundError: javax/transaction/TransactionManager at java.lang.Class.getMethods0(Native Method) at java.lang.Class.getDeclaredMethods(Class.java:1039) at java.io.ObjectStreamClass.computeSerialVersionUID(ObjectStreamClass.java:873) at java.io.ObjectStreamClass.access$200(ObjectStreamClass.java:46) at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:420) at java.security.AccessController.doPrivileged(Native Method) at java.io.ObjectStreamClass.init(ObjectStreamClass.java:401) at java.io.ObjectStreamClass.lookupInternal(ObjectStreamClass.java:112) at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:59) at java.io.ObjectStreamClass.lookupInternal(ObjectStreamClass.java:88) at java.io.ObjectStreamClass.lookup(ObjectStreamClass.java:59) at java.io.ObjectStreamClass.lookupInternal(ObjectStreamClass.java:88) at java.io.ObjectStreamClass.setClass(ObjectStreamClass.java:566) at java.io.ObjectInputStream.inputClassDescriptor(ObjectInputStream.java:936) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:366) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236) at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1186) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386) at java.io.ObjectInputStream.inputClassFields(ObjectInputStream.java:2262) at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:519) at java.io.ObjectInputStream.inputObject(ObjectInputStream.java:1411) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:386) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236) at java.rmi.MarshalledObject.get(MarshalledObject.java:138) at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:299) at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:279) at javax.naming.InitialContext.lookup(InitialContext.java:350) at EJB.doGet(EJB.java:86) at javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404) at org.apache.tomcat.core.Handler.service(Handler.java:286) at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372) at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:799) at org.apache.tomcat.core.ContextManager.service(ContextManager.java:745) at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210) at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:407) at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498) at java.lang.Thread.run(Thread.java:484) _______________________________________________________ Tired of slow Internet? 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