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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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via strutstestcase by nobody
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This exception has no message.
via GitHub by linkmauve
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This exception has no message.
java.lang.NullPointerException: 	at java.util.Hashtable.put(	at weblogic.servlet.internal.session.JDBCSessionContext.getJdbcProps(	at weblogic.servlet.internal.session.JDBCSessionContext.getNewSession(	at weblogic.servlet.internal.session.SessionContext.getNewSessionInstance(	at weblogic.servlet.internal.ServletRequestImpl.getNewSession(	at weblogic.servlet.internal.ServletRequestImpl.getSession(	at EBWebServer.EBServlet.service(	at javax.servlet.http.HttpServlet.service(	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(	at weblogic.servlet.internal.WebAppServletContext.invokeServlet(	at weblogic.servlet.internal.ServletRequestImpl.execute(	at weblogic.kernel.ExecuteThread.execute(	at