Hi, I am new to jboss world and i m currently having some problems deploying EJB in jboss. I am using 1) MyEclipse IDE for J2EE Development 2) Jboss 4.04 AS 3) SUn JDKEE 5.0 Problem: I have written an entity bean and have deployed it. I am alble to view that in the GLOBAL NAMESPACE of JNDI View. I tried creating a client to the EJB within the same EJB project which is nothing but a java class and it worked fine. Now when i am trying to create another web client to call the same deployed entity bean then i m getting the following exception: Exception: ------------------------------------------------------------------------------------- javax.servlet.ServletException: Servlet execution threw an exception org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) root cause java.lang.LinkageError: loader constraints violated when linking javax/ejb/Handle class java.lang.Class.getDeclaredFields0(Native Method) java.lang.Class.privateGetDeclaredFields(Unknown Source) java.lang.Class.getDeclaredField(Unknown Source) java.io.ObjectStreamClass.getDeclaredSUID(Unknown Source) java.io.ObjectStreamClass.access$700(Unknown Source) java.io.ObjectStreamClass$2.run(Unknown Source) java.security.AccessController.doPrivileged(Native Method) java.io.ObjectStreamClass.(Unknown Source) java.io.ObjectStreamClass.lookup(Unknown Source) java.io.ObjectStreamClass.initProxy(Unknown Source) java.io.ObjectInputStream.readProxyDesc(Unknown Source) java.io.ObjectInputStream.readClassDesc(Unknown Source) java.io.ObjectInputStream.readOrdinaryObject(Unknown Source) java.io.ObjectInputStream.readObject0(Unknown Source) java.io.ObjectInputStream.readObject(Unknown Source) java.rmi.MarshalledObject.get(Unknown Source) org.jnp.interfaces.MarshalledValuePair.get(MarshalledValuePair.java:72) org.jnp.interfaces.NamingContext.lookup(NamingContext.java:652) org.jnp.interfaces.NamingContext.lookup(NamingContext.java:587) javax.naming.InitialContext.lookup(Unknown Source) com.ssnsase.sms.servlet.AccountServ.doPost(AccountServ.java:80) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) javax.servlet.http.HttpServlet.service(HttpServlet.java:810) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs. -------------------------------------------------------------------------------- Apache Tomcat/5.5.17 I tried so many resources in google to fix this problem but fount it fruitless... Can someone help me in this regard? Thanks & Regards Krishnan G