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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 41057] New: - Tomcat leaks memory on every request
Date Tue, 28 Nov 2006 18:07:27 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=41057

           Summary: Tomcat leaks memory on every request
           Product: Tomcat 5
           Version: 5.5.20
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Catalina
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: vilks56@gmail.com


POST parameter values stay referenced by a static field in
org.apache.tomcat.util.buf.StringCache - thus the GC can never release the memory.

Steps to Reproduce:
1) install and start tomcat 5.5
(http://apache.zone-h.org/tomcat/tomcat-5/v5.5.20/bin/apache-tomcat-5.5.20.zip)

2) see the example webapp "Request Parameters Example" included in the install
(http://localhost:8080/servlets-examples/servlet/RequestParamExample)

3) run script "send.sh" to create heavy load
#!/bin/bash

export LEAK_COMMAND='curl --silent
http://localhost:8080/servlets-examples/servlet/RequestParamExample --output
response.htm --data @send.txt'

#create initial POST parameter with value about 10kB

echo "firstname=" > send.txt
for((i=0;$i<=10000;i=$(($i+1))));do
  echo -n "x" >> send.txt
done


#send the request
for((i=0;$i<=1000;i=$(($i+1))));do
  echo $i
  # modify the param value to send (append i)
  echo -n $i >> send.txt
  
  $LEAK_COMMAND

done

4) running the script causes heap usage to increase for some 40MB

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