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java.lang.NullPointerException at org.apache.coyote.http11.InternalNioOutputBuffer.flushBuffer(InternalNioOutputBuffer.java:234) at org.apache.coyote.http11.InternalNioOutputBuffer.addToBB(InternalNioOutputBuffer.java:189) at org.apache.coyote.http11.InternalNioOutputBuffer.commit(InternalNioOutputBuffer.java:177) at org.apache.coyote.http11.AbstractHttp11Processor.action(AbstractHttp11Processor.java:748) at org.apache.coyote.Response.action(Response.java:177) at org.apache.coyote.http11.AbstractOutputBuffer.endRequest(AbstractOutputBuffer.java:369) at org.apache.coyote.http11.AbstractHttp11Processor.endRequest(AbstractHttp11Processor.java:1818) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1157) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:686) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745)