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POtomcat java.util.logging process
 

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    <p>I have a linux (ubuntu) server running tomcat7. The server has 1GB of ram, and I am getting heap space errors thrown from java.</p> <p>Basically what is happening, is that my tomcat server (running my servlet code) is throwing exceptions because there is no more memory to allocate. My code is pretty lean, so I don't think that is the problem. </p> <p>When I look at htop, I see a lot of java logging processes, I see about 30 of these processes:</p> <pre><code>ps ax | grep java 7412 pts/0 Sl 0:02 /usr/bin/java -Djava.util.logging.config.file=/usr/share/tomcat/apache-tomcat-7.0.29/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/usr/share/tomcat/apache-tomcat-7.0.29/endorsed -classpath /usr/share/tomcat/apache-tomcat-7.0.29/bin/bootstrap.jar:/usr/share/tomcat/apache-tomcat-7.0.29/bin/tomcat-juli.jar -Dcatalina.base=/usr/share/tomcat/apache-tomcat-7.0.29 -Dcatalina.home=/usr/share/tomcat/apache-tomcat-7.0.29 -Djava.io.tmpdir=/usr/share/tomcat/apache-tomcat-7.0.29/temp org.apache.catalina.startup.Bootstrap start 7426 pts/0 D+ 0:00 grep --color=auto java 25937 ? Sl 13:12 /usr/bin/java -Djava.util.logging.config.file=/usr/share/tomcat/apache-tomcat-7.0.29/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/usr/share/tomcat/apache-tomcat-7.0.29/endorsed -classpath /usr/share/tomcat/apache-tomcat-7.0.29/bin/bootstrap.jar:/usr/share/tomcat/apache-tomcat-7.0.29/bin/tomcat-juli.jar -Dcatalina.base=/usr/share/tomcat/apache-tomcat-7.0.29 -Dcatalina.home=/usr/share/tomcat/apache-tomcat-7.0.29 -Djava.io.tmpdir=/usr/share/tomcat/apache-tomcat-7.0.29/temp org.apache.catalina.startup.Bootstrap start </code></pre> <p>These java processes slowly leaks memory over time, and because I only have 1gb of ram to play with my tomcat server starts throwing heap space exceptions.</p> <p>I have fiddled with log4j (but it should be turned off) and I have done all I can to turn off logging in configs I can find.</p> <p>Any help would be great, I just need to get rid of these processes - they are way to greedy. Thanks!</p> <p>~ Dan</p> <p>EDIT: MORE INFO:</p> <p>Hey Guys, this is probably a big enough hint to solve this one entirely - I checked some of the startup debug and came up with this:</p> <pre><code> Oct 02, 2012 8:50:08 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads SEVERE: The web application [/NMVServer] appears to have started a thread named [http-bio-8080-exec-53] but has failed to stop it. This is very likely to create a memory leak. Oct 02, 2012 8:50:08 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads SEVERE: The web application [/NMVServer] appears to have started a thread named [http-bio-8080-exec-54] but has failed to stop it. This is very likely to create a memory leak. Oct 02, 2012 8:50:08 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads SEVERE: The web application [/NMVServer] appears to have started a thread named [http-bio-8080-exec-62] but has failed to stop it. This is very likely to create a memory leak. Oct 02, 2012 8:50:08 AM org.apache.catalina.loader.WebappClassLoader clearReferencesThreads SEVERE: The web application [/NMVServer] appears to have started a thread named [http-bio-8080-exec-64] but has failed to stop it. This is very likely to create a memory leak. </code></pre> <p>One problem with leaks that I found is due to a bug with the JDBC Driver <a href="http://bugs.mysql.com/bug.php?id=36565" rel="nofollow">http://bugs.mysql.com/bug.php?id=36565</a> according to a couple of forums. That solves another message I was getting.</p> <p>I have been looking around and I have found this which is quite useful:</p> <p><a href="http://wiki.apache.org/tomcat/MemoryLeakProtection" rel="nofollow">http://wiki.apache.org/tomcat/MemoryLeakProtection</a></p> <p>Now I am just trying to work through all your advise thanks heaps!</p> <p>~ Dan</p>
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    1. COPlease run `ps ax | grep java` and paste one *full* command line. The part you have pasted only shows a bunch of configuration options. The actual class being called is not visible...
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    2. COSorry about the delay and the dodgey initial post. I have updated it with proper info.
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    3. COYou mean you have about 30 processes which are similar to one with pid 7412 in your post? But that process represents the whole Tomcat server, as can be seen from "org.apache.catalina.startup.Bootstrap start". That means you have 30 servers up and running?
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