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.
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