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This exception has no message.
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)