Подскажите пожалуйста какие нюансы есть при вызове stateless ejb bean из самодельного Authentication Provider для Weblogic ? Может дадите ссылку на доку ?

Собственно вот кусок кода из Authentication Adapter

   public String[] authenticate(Callback[] callbacks) throws LoginException {
        userName = getUserName(callbacks);


        Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
        UserManagerBeanRemote session = createSession();
        Collection<String> privileges;
        try {
            long userId = session.authonitacateUser(userName);
            privileges = session.getUserPrivileges(userId);
        } catch (RemoteException e) {
            throw new LoginException("Failed to perform call [" + e.getMessage() + "]");
        }

        Collection<String> principals = new HashSet<String>(privileges.size());

        for (String privilege : privileges) {
            principals.add(privilege);
        }

        return principals.toArray(new String[principals.size()]);
    }


    private static UserManagerBeanRemote createSession() throws LoginException {
        UserManagerBeanRemote result;
        javax.naming.InitialContext initialContext = null;

        try {
            initialContext = new javax.naming.InitialContext(null);
            Object objRef = initialContext.lookup(userManagerBeanJNDIName);
            Object homeObj = javax.rmi.PortableRemoteObject.narrow(objRef, UserManagerBeanRemoteHome.class);
            UserManagerBeanRemoteHome home = (UserManagerBeanRemoteHome)homeObj;
            result = home.create();
        } catch (CreateException ce){
            throw new LoginException("Failed to create login ejb.");
        }
        catch (NamingException e) {
            throw new LoginException("Failed to locate login ejb.");
        }
        catch (RemoteException e) {
            throw new LoginException("Failed to create login ejb.");
        }
        finally {
            try {
                if ( initialContext != null )
                    initialContext.close();
            }
            catch (Exception e) {
                // ignore
            }
        }

        return result;
    }

получаю странный Exception


java.lang.NullPointerException
at weblogic.logging.commons.LogImpl.doLog(LogImpl.java:95)
at weblogic.logging.commons.LogImpl.warn(LogImpl.java:75)
at weblogic.logging.commons.LogImpl.warn(LogImpl.java:71)
at org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:516)
at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.processException(PageFlowRequestProcessor.java:987)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.access$201(PageFlowRequestProcessor.java:95)
at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor$ActionRunner.execute(PageFlowRequestProcessor.java:2042)
at org.apache.beehive.netui.pageflow.interceptor.action.internal.ActionInterceptors.wrapAction(ActionInterceptors.java:90)
at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.processActionPerform(PageFlowRequestProcessor.java:2114)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.processInternal(PageFlowRequestProcessor.java:554)
at org.apache.beehive.netui.pageflow.PageFlowRequestProcessor.process(PageFlowRequestProcessor.java:851)
at org.apache.beehive.netui.pageflow.AutoRegisterActionServlet.process(AutoRegisterActionServlet.java:630)
at org.apache.beehive.netui.pageflow.PageFlowActionServlet.process(PageFlowActionServlet.java:157)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:223)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:175)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3242)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2003)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1909)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1359)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)

Подскажите пожалуйста кто чем может...