Hi,
We are facing high CPU usage in our application hosted on Tomcat. After
getting thread dumps, I see the following information. Seems like the
RE.java is getting processed continuously and due to this few threads in
Tomcat are stuck forever. This pushes the CPU usage above 90% and making
the application very unstable.
Please advice.
Below is the info from thread dump:
TP-Processor5396" daemon prio=10 tid=0x022cff28 nid=0x1f91b runnable
[0x4dcfb000..0x4dcffc70]
at org.apache.regexp.RE.matchNodes(RE.java:860)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchNodes(RE.java:1376)
at org.apache.regexp.RE.matchAt(RE.java:1448)
at org.apache.regexp.RE.match(RE.java:1498)
at org.apache.regexp.RE.match(RE.java:1468)
at org.apache.regexp.RE.match(RE.java:1561)
at
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
tionFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
erChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
e.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
e.java:175)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
:128)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:2
86)
at
org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:190)
at
org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:283)
at
org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:767)
at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:
697)
at
org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.
java:889)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool
.java:690)
at java.lang.Thread.run(Thread.java:595)
Here is the regex related code in our application :
try{
RE r = new
RE("^[\\w\\-]+(\\.)?[\\w\\...@[\\w\\-\\.]+(\\.([a-z]){2,4})$");
RE r1 = new RE("^\\w{5,65}$");
match = r.match(userID);
if(!match)
match = r1.match(userID);
}catch(Exception ex){
throw new BusinessException(ex);
}
Any thoughts????
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