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java.lang.NullPointerException: 	at org.apache.catalina.connector.http.HttpResponseStream.checkHead(HttpResponseStream.java:253)	at org.apache.catalina.connector.http.HttpResponseStream.(HttpResponseStream.java:104)	at org.apache.catalina.connector.http.HttpResponseImpl.createOutputStream(HttpResponseImpl.java:220)	at org.apache.catalina.connector.ResponseBase.getOutputStream(ResponseBase.java:725)	at org.apache.catalina.connector.ResponseBase.finishResponse(ResponseBase.java:469)	at org.apache.catalina.connector.HttpResponseBase.finishResponse(HttpResponseBase.java:236)	at org.apache.catalina.connector.http.HttpResponseImpl.finishResponse(HttpResponseImpl.java:288)	at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1039)	at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1107)	at java.lang.Thread.run(Thread.java:479)