EJB Call from Servlet

[Wolfgang Willingh�fer]

Hallo,

i have a problem calling EJBs from a servlet.

I deploy an EAR with some session EJB and an embedded WAR file. The WAR file contains a servlet, which do the folling java calls:

CallbackHandler handler = new WSCallbackHandlerImpl(userId, pPassword);
loginContext = new LoginContext("myContext", handler);
EJBClientContextBuilder.getInstance().create().lookup("");
loginContext.login();
WSSubject.setRunAsSubject(loginContext.getSubject());

Using the classloader settings (classloader Policy: Application / PARENT_FIRST) everythink works fine. Because of jar version conflicts i have to use PARENT_LAST (WebSphere 6.0.x contains an old js.jar file). Using PARENT_LAST i got the following error:

java.lang.SecurityException: unable to instantiate LoginConfiguration
        at javax.security.auth.login.Configuration.getConfiguration(Configuration.java:212)
        at javax.security.auth.login.LoginContext$1.run(LoginContext.java:166)
        at java.security.AccessController.doPrivileged1(Native Method)
        at java.security.AccessController.doPrivileged(AccessController.java(Compiled Code))
        at javax.security.auth.login.LoginContext.init(LoginContext.java:163)
        at javax.security.auth.login.LoginContext.<init>(LoginContext.java:319)
        at de.comconsult.login.WebSphereLoginClient.login(WebSphereLoginClient.java:109)

Thanks in advance

Wolfgang