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https://issues.apache.org/jira/browse/WICKET-438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12490392
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Stefan Wille commented on WICKET-438:
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We think that the remaining issue is caused by Linux, not Wicket.
We have tried Jetty 6.1.1 instead of Tomcat 5.5 on our Linux server, which
didn't help.
Then we tried Wicket 1.3 with wicket-examples and Jetty on two other Linux
machines, and the problem seems to be gone.
These two machines have a newer kernel and probably a newer glibc.
We still see the number of open wicket jar files increase by about 15, but it
also decreases to the starting point, although slowly.
Next Monday we are going to try the 1.2.6 development branch with our
application on the two new Linux machines.
> File handles are leaked when loading images from a jar file, Tomcat crashes
> ---------------------------------------------------------------------------
>
> Key: WICKET-438
> URL: https://issues.apache.org/jira/browse/WICKET-438
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.2.5
> Environment: java version "1.5.0_07", Mac OS X 10.4, Tomcat 5.5.20
> and also
> java version "1.5.0_07", Linux 2.6.8, Tomcat 5.5.17
> Firefox 2.0.3 with Web developer Toolbar
> Reporter: Stefan Wille
> Assigned To: Johan Compagner
> Fix For: 1.2.6
>
> Attachments: UrlResourceStream.java
>
>
> Wicket leaks file handles when it accesses image files that are part of a jar
> file, e.g. wicket-1.2.5.jar.
> To reproduce this bug, please switch off the browser cache.
> My Wicket application uses TreeTable. When I access the page with the
> TreeTable on my Mac server, I see the number of open file handles jump. If I
> do that repeatedly, I can leak about 50 file handles.
> I observe the number of open file handles via this shell command: while true;
> do sleep 1; lsof | grep wicket | wc -l; done
> If I do the same test on a Linux server, the number of open files jumps so
> quickly that I reach 1015 open files after about 4 requests. At this point,
> Tomcat runs out of file handles, writes a log entry in catalina.out and dies.
> Probably Tomcat shouldn't crash, but the problem is that Wicket leaks file
> handles.
> I can also see leaked file handles when I repeatedly access an image from a
> jar file via
> http://localhost:8070/wicket-examples/ajax/resources/wicket.extensions.markup.html.tree.DefaultAbstractTree/res/tree-images.png
> The problem can also be reproduced via wicket-examples 1.2.5 and its
> TreeTable example page by exanding and collapsing the tree table repeatedly.
> If I unpack both wicket-1.2.5.jar and wicket-extensions-1.2.5.jar in
> WEB-INF/classes and delete the jars afterwards, the number of used file
> handles remains constant at 5! So access to images in WEB-INF/classes works
> fine.
> "lsof | grep wicket" gives me:
> firefox-b 1372 stefan 19r REG 14,2 486664 1733273
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> bash 1880 stefan cwd DIR 14,2 578 1058285
> /Users/stefan/Software/wicket-1.2.5
> bash 4339 stefan cwd DIR 14,2 578 1058285
> /Users/stefan/Software/wicket-1.2.5
> java 9529 stefan txt REG 14,2 1249210 1750285
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-1.2.zoomos-SNAPSHOT.jar
> java 9529 stefan txt REG 14,2 486664 1750274
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> java 9529 stefan txt REG 14,2 11063 1750305
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-spring-annot-1.2.5.jar
> java 9529 stefan txt REG 14,2 24890 1750306
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-spring-1.2.5.jar
> java 9529 stefan 29r REG 14,2 486664 1750274
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> java 9529 stefan 30r REG 14,2 486664 1750274
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> java 9529 stefan 31r REG 14,2 486664 1750274
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> java 9529 stefan 32r REG 14,2 486664 1750274
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> java 9529 stefan 33r REG 14,2 486664 1750274
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> java 9529 stefan 34r REG 14,2 486664 1750274
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> java 9529 stefan 35r REG 14,2 486664 1750274
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> java 9529 stefan 36r REG 14,2 486664 1750274
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> java 9529 stefan 37r REG 14,2 486664 1750274
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> java 9529 stefan 38r REG 14,2 486664 1750274
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> java 9529 stefan 39r REG 14,2 486664 1750274
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> java 9529 stefan 40r REG 14,2 486664 1750274
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> java 9529 stefan 41r REG 14,2 486664 1750274
> /Users/stefan/Software/apache-tomcat-5.5.20/webapps/middletier/WEB-INF/lib/wicket-extensions-1.2.5.jar
> [...many lines like this deleted]
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