[jboss-user] High CPU due to threads looping in OutputBuffer.realWriteChars

Hi all, We're seeing JBoss consumes high CPU and the thread dumps and CPU data indicates that the high consuming threads are always in some point of the OutputBuffer.realWriteChars method and its underlying char to byte conversions and buffer flushes, for example "ajp-127.0.0.1-8009-1" daemon prio=10 tid=0x00002aabd4fb2000 nid=0x7a6 runnable [0x00002b24a1517000] java.lang.Thread.State: RUNNABLE at sun.nio.cs.ISO_8859_1$Encoder.encodeArrayLoop(ISO_8859_1.java:148) at sun.nio.cs.ISO_8859_1$Encoder.encodeLoop(ISO_8859_1.java:187) at java.nio.charset.CharsetEncoder.encode(CharsetEncoder.java:544) at org.apache.tomcat.util.buf.C2BConverter.convert(C2BConverter.java:91) at org.apache.catalina.connector.OutputBuffer.realWriteChars(OutputBuffer.java:465) at org.apache.tomcat.util.buf.CharChunk.flushBuffer(CharChunk.java:440) at org.apache.tomcat.util.buf.CharChunk.append(CharChunk.java:295) at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:499) at org.apache.catalina.connector.CoyoteWriter.write(CoyoteWriter.java:143) at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:119) at org.apache.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:326) Does anybody know how to fix it? In fact, there is an article which describes the same situation I have. But I have no enough privileges to read the full content. Can you help me ? https://access.redhat.com/solutions/129963 thanks, br, /nf