EJB running at client, weblogic security problem

Hi:
I have a problem. I run EJB client by webstart at web, when initialized the context of properties, the exception is thrown, detail is:

java.lang.ExceptionInInitializerError

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Unknown Source)

at weblogic.jndi.WLInitialContextFactory.getInitialContext(WLInitialContextFactory.java:145)

at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)

at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)

at javax.naming.InitialContext.init(Unknown Source)

at javax.naming.InitialContext.<init>(Unknown Source)

at ownertest.OwnerClient.getInitialContext(OwnerClient.java:62)

at ownertest.OwnerClient.initialize(OwnerClient.java:28)

at ownertest.OwnerClient.<init>(OwnerClient.java:16)

at ownertest.OwnerTest.testButton_actionPerformed(OwnerTest.java:164)

at ownertest.OwnerTest_testButton_actionAdapter.actionPerformed(OwnerTest.java:180)

at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)

at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Unknown Source)

at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)

at javax.swing.DefaultButtonModel.setPressed(Unknown Source)

at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)

at java.awt.Component.processMouseEvent(Unknown Source)

at java.awt.Component.processEvent(Unknown Source)

at java.awt.Container.processEvent(Unknown Source)

at java.awt.Component.dispatchEventImpl(Unknown Source)

at java.awt.Container.dispatchEventImpl(Unknown Source)

at java.awt.Component.dispatchEvent(Unknown Source)

at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)

at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)

at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)

at java.awt.Container.dispatchEventImpl(Unknown Source)

at java.awt.Window.dispatchEventImpl(Unknown Source)

at java.awt.Component.dispatchEvent(Unknown Source)

at java.awt.EventQueue.dispatchEvent(Unknown Source)

at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

at java.awt.EventDispatchThread.run(Unknown Source)

Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission getClassLoader)

at java.security.AccessControlContext.checkPermission(Unknown Source)

at java.security.AccessController.checkPermission(Unknown Source)

at java.lang.SecurityManager.checkPermission(Unknown Source)

at java.lang.ClassLoader.getSystemClassLoader(Unknown Source)

at weblogic.rmi.internal.ClientRuntimeDescriptor.computeInterfaces(ClientRuntimeDescriptor.java:238)

at weblogic.rmi.internal.ClientRuntimeDescriptor.intern(ClientRuntimeDescriptor.java:130)

at weblogic.jndi.WLInitialContextFactoryDelegate.<clinit>(WLInitialContextFactoryDelegate.java:165)

... 35 more

Application server is:weblogic7.0, ejb and client is generated by Jbuilder9, the code of initialized the context is:

String url = "t3://jin:7001";
String user = "admin";
String password = "123";
Properties properties = null;
try {
properties = new Properties();
properties.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
properties.put(Context.PROVIDER_URL, url);
if (user != null) {
properties.put(Context.SECURITY_PRINCIPAL, user);
properties.put(Context.SECURITY_CREDENTIALS, password == null ? "" : password);
}

return new InitialContext(properties);
}
catch(Exception e) {
log("Unable to connect to WebLogic server at " + url);
log("Please make sure that the server is running.");
throw e;
}

My jnlp file is:
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="http://localhost:7001" href="webSt.jnlp">
<information>
<title>test</title>
<vendor>sdf</vendor>
<homepage href="webSt.html" />
<description>sdf</description>
<offline-allowed />
</information>
<resources>
<j2se version="1.4" />
<jar href="OwnerTest.jar" />
<jar href="Weblogic.jar" />
<jar href="WebServices.jar" />
</resources>
<application-desc main-class="ownertest.OwnerTest" />
</jnlp>

It is a security of problem, but I don't know how to resolve it.

Regards