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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:739)	at org.apache.coyote.Response.action(Response.java:178)	at org.apache.coyote.http11.AbstractOutputBuffer.doWrite(AbstractOutputBuffer.java:250)	at org.apache.coyote.Response.doWrite(Response.java:523)	at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:391)	at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:426)	at org.apache.catalina.connector.OutputBuffer.realWriteChars(OutputBuffer.java:474)	at org.apache.tomcat.util.buf.CharChunk.flushBuffer(CharChunk.java:393)	at org.apache.tomcat.util.buf.CharChunk.append(CharChunk.java:337)	at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:537)	at org.apache.catalina.connector.CoyoteWriter.write(CoyoteWriter.java:174)	at org.apache.catalina.connector.CoyoteWriter.write(CoyoteWriter.java:184)