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

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java.lang.NullPointerException:
at java.io.File.(File.java:175)
at weblogic.knex.dispatcher.ServerUtil.makeCookContext(ServerUtil.java:114)
at weblogic.knex.dispatcher.HttpServer.doPost(HttpServer.java:206)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1075)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:418)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:306)
at weblogic.security.service.SecurityServiceManager.runAs(SecurityServiceManager.java:685)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3155)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:234)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:210)

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