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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 weblogic.servlet.internal.ChunkWriter.write(ChunkWriter.java:37)	at java.io.Writer.write(Writer.java:148)	at java.io.PrintWriter.write(PrintWriter.java:208)