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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)