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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.finish(ServletOutputStreamImpl.java:496)	at weblogic.servlet.internal.ServletResponseImpl.send(ServletResponseImpl.java:804)	at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:1534)	at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)