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

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java.lang.NullPointerException:
at weblogic.servlet.internal.ServletResponseImpl.writeHeaders(ServletResponseImpl.java:968)
at weblogic.servlet.internal.ServletOutputStreamImpl.sendHeaders(ServletOutputStreamImpl.java:239)
at weblogic.servlet.internal.ServletOutputStreamImpl.flush(ServletOutputStreamImpl.java:121)
at weblogic.servlet.internal.ServletOutputStreamImpl.commit(ServletOutputStreamImpl.java:481)
at weblogic.servlet.internal.ChunkOutput.commit(ChunkOutput.java:259)
at weblogic.servlet.internal.ChunkOutputWrapper.write(ChunkOutputWrapper.java:91)
at java.io.Writer.write(Writer.java:148)
at java.io.PrintWriter.write(PrintWriter.java:208)
at java.io.PrintWriter.write(PrintWriter.java:224)
at java.io.PrintWriter.print(PrintWriter.java:355)
at weblogic.servlet.internal.ServletResponseImpl.sendError(ServletResponseImpl.java:414)
at weblogic.servlet.internal.ServletResponseImpl.sendError(ServletResponseImpl.java:368)
at weblogic.socket.MuxableSocketDiscriminator.dispatch(MuxableSocketDiscriminator.java:277)
at weblogic.socket.PosixSocketMuxer.deliverGoodNews(PosixSocketMuxer.java:770)
at weblogic.socket.PosixSocketMuxer.processSockets(PosixSocketMuxer.java:694)
at weblogic.socket.SocketReaderRequest.execute(SocketReaderRequest.java:23)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:213)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:189)

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