Hi, I faced a queer error with JBoss 4.2.2 GA, so thought of reporting it even though I managed to circumvent the problem. I have a stateless EJB LoginBean, with remote interface Login: Remote Interface: package com.justbooks.security; | | import javax.ejb.Remote; | | import com.justbooks.entities.Profile; | | @Remote | public interface Login { | public boolean signOn(Profile profile); | public boolean signOn(String loginName, String loginPassword); | } | Bean Class: | package com.justbooks.security; | | import javax.ejb.Stateless; | | import com.justbooks.entities.Profile; | import com.justbooks.security.Login; | import javax.persistence.*; | import com.justbooks.utility.*; | | public @Stateless class LoginBean implements Login | I have a DAO Stateless EJB called ProfileDAOBean, with remote interface ProfileDAO: Remote Interface: package com.justbooks.dao; | | import javax.ejb.Remote; | | import com.justbooks.entities.Profile; | | @Remote | public interface ProfileDAO { | public Profile findProfile(String loginName); | public boolean authenticate(String loginName, String loginPassword); | public boolean changePassword(String loginName, String oldPassword, | String newPassword); | | } | Bean Class: | package com.justbooks.dao; | | import javax.naming.Context; | import javax.naming.NamingException; | import javax.persistence.EntityManager; | import javax.persistence.PersistenceContext; | import javax.persistence.Query; | import javax.ejb.Stateless; | | import com.justbooks.utility.EJBFinder; | import com.justbooks.entities.Profile; | import com.justbooks.security.ChangePassword; | import com.justbooks.security.Login; | | public @Stateless class ProfileDAOBean implements ProfileDAO | If I include the lookup code for LoginBean inside ProfileDAOBean, then the application works just fine. But if I use a helper class to find EJBs, my application throws up an error saying anonymous wrote : 15:01:57,890 ERROR [[default]] Servlet.service() for servlet default threw exception | java.lang.LinkageError: loader constraints violated when linking com/justbooks/security/Login class EJBHelper: package com.justbooks.utility; | | import javax.naming.Context; | import javax.naming.NamingException; | | import com.justbooks.security.ChangePassword; | import com.justbooks.security.Login; | | public final class EJBHelper { | private static Context getInitialContext() | throws javax.naming.NamingException | { | return new javax.naming.InitialContext(); | } | | public static Login getLoginEJB() { | try { | Context jndiContext = getInitialContext(); | //TODO put these lookup strings in properties file | Object ref = jndiContext.lookup("JustAutomate/LoginBean/remote"); | Login login = (Login)ref; | return login; | }catch (NamingException ne) { | ne.printStackTrace(); | return null; | } | } | | public static ChangePassword getChangePasswordEJB() { | try { | Context jndiContext = getInitialContext(); | //TODO put these lookup strings in properties file | Object ref = jndiContext.lookup("JustAutomate/ChangePasswordBean/remote"); | ChangePassword changePassword = (ChangePassword)ref; | return changePassword; | }catch (NamingException ne) { | ne.printStackTrace(); | return null; | } | } | } If I change the name of the class to EJBFinder, then everything starts working fine again. Not sure what the problem is. As of now, I have circumvented the problem by renaming the class from EJBHelper to EJBFinder. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4133816#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...