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java.lang.NullPointerException at org.apache.coyote.http11.InternalNioOutputBuffer.flushBuffer( at org.apache.coyote.http11.InternalNioOutputBuffer.addToBB( at org.apache.coyote.http11.InternalNioOutputBuffer.commit( at org.apache.coyote.http11.AbstractHttp11Processor.action( at org.apache.coyote.Response.action( at org.apache.coyote.http11.AbstractOutputBuffer.doWrite( at org.apache.coyote.Response.doWrite( at org.apache.catalina.connector.OutputBuffer.realWriteBytes( at org.apache.tomcat.util.buf.ByteChunk.flushBuffer( at org.apache.catalina.connector.OutputBuffer.realWriteChars( at org.apache.tomcat.util.buf.CharChunk.flushBuffer( at org.apache.tomcat.util.buf.CharChunk.append( at org.apache.catalina.connector.OutputBuffer.write( at org.apache.catalina.connector.CoyoteWriter.write( at org.apache.catalina.connector.CoyoteWriter.write(