java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at java.util.Hashtable.put(Hashtable.java:380)
at weblogic.servlet.internal.session.ClusteredSessionContextImpl.getJdbcProps(ClusteredSessionContextImpl.java:138)
at weblogic.servlet.internal.session.ClusteredSessionContextImpl.getNewSession(ClusteredSessionContextImpl.java:51)
at weblogic.servlet.internal.session.SessionContext.getNewSessionInstance(SessionContext.java:113)
at weblogic.servlet.internal.ServletRequestImpl.getNewSession(ServletRequestImpl.java:1448)
at jsp_servlet._session._jspService(_session.java:86)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:208)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:1127)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)

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