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

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java.lang.NullPointerException:
at weblogic.servlet.internal.HttpServer.setServerList(HttpServer.java:251)
at weblogic.servlet.internal.HttpServer.getHash(HttpServer.java:270)
at weblogic.servlet.internal.ServletResponseImpl.writeHeaders(ServletResponseImpl.java:659)
at weblogic.servlet.internal.ServletOutputStreamImpl.flush(ServletOutputStreamImpl.java:124)
at weblogic.servlet.internal.ServletOutputStreamImpl.flushWithCheck(ServletOutputStreamImpl.java:451)
at weblogic.servlet.internal.ServletOutputStreamImpl.print(ServletOutputStreamImpl.java:243)
at javax.servlet.ServletOutputStream.println(ServletOutputStream.java:286)
at weblogic.servlet.jsp.JspWriterImpl.println(JspWriterImpl.java:204)
at weblogic.management.console.pages._common._requestinfo.print(_requestinfo.java:68)
at weblogic.management.console.pages._common._requestinfo._jspService(_requestinfo.java:224)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)

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