java.lang.LinkageError Exception

[krishnan7785]

Hi,

I am new to jboss world and i m currently having some problems deploying EJB in jboss.


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

[jaikiran]

Are you packaging any jar files containing the javax.ejb.* packages? If yes, then for a simple fix, remove them from your application packaging. They are already available in the the jar files under %JBOSS_HOME%/server/< serverName>/lib folder. For more details about classloading and issues that you might encounter because of the packaging, have a look at :

http://wiki.jboss.org/wiki/Wiki.jsp?page=ClassCastExceptions

http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossClassLoadingUseCases

http://wiki.jboss.org/wiki/Wiki.jsp?page=ClassLoadingConfiguration

[krishnan7785]

Thanks Jaikiran for yr references...I was somehow able to resolve the problem. Initially all i did was to create an entity bean and a web client that would call my entity bean. Then i had created a EAR containing the war and Jar files and deployed it on the server. Everything seemed to be right but i was getting the Exception mentioned above. Later i saw in one of the forums to change a configuration file in directory C:\jboss-4.0.4.GA\jboss-4.0.4.GA\server\default\deploy\jbossweb-tomcat55.sar\META-INF\jboss-service.xml


In the file there is an attribute by the name "UseJBossWebLoader".

When i set this attribute to true then everything seems to work alright...

I still couldn't understand both the problem and the solution :). Do u have any explanations for this? Meanwhile i shall go thru the references that u have sent for any answers that i cud get...