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java.lang.NullPointerException: 	at org.apache.coyote.http11.InternalNioOutputBuffer.flushBuffer(InternalNioOutputBuffer.java:233)	at org.apache.coyote.http11.InternalNioOutputBuffer.endRequest(InternalNioOutputBuffer.java:121)	at org.apache.coyote.http11.AbstractHttp11Processor.action(AbstractHttp11Processor.java:762)	at org.apache.coyote.Response.action(Response.java:174)	at org.apache.coyote.Response.finish(Response.java:274)	at org.apache.catalina.connector.OutputBuffer.close(OutputBuffer.java:319)	at org.apache.catalina.connector.Response.finishResponse(Response.java:553)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:450)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1757)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1716)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Thread.java:744)