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POPermgen Memory Leak with hot redeploy and Oracle database
 

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  1. POPermgen Memory Leak with hot redeploy and Oracle database
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    <p>i've got a SpringRoo-based application that is running in a production environment, that is causing severe permgen memory leaks after some hot redeploys.</p> <p>In order to "find and fix" the leak and to reduce the variables during analysis, i've created a simple, streamlined application using roo, and i obtain the same behaviour. The project (created with Spring Roo (1.2.3.RELEASE)) simply persists an entity called 'Person' with a string field called 'name'.</p> <p>I deploy the war on a Tomcat 7.0.39, using Oracle 11.2.0.2 as the database. After every re-deploy, i get this message in catalina.out</p> <pre><code>INFO: Undeploying context [/ojdbc-0.1.0.BUILD-SNAPSHOT] mag 06, 2013 10:50:43 AM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc SEVERE: The web application [/ojdbc-0.1.0.BUILD-SNAPSHOT] registered the JDBC driver [oracle.jdbc.OracleDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. </code></pre> <p>After two hot-redeploys, i get a <em>permgen error</em>:</p> <pre><code>mag 06, 2013 10:51:08 AM org.apache.catalina.startup.HostConfig deployWAR INFO: Deploying web application archive /Applications/apache-tomcat-7.0.39/webapps/ojdbc- 0.1.0.BUILD-SNAPSHOT.war Exception in thread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" Exception in thread "RMI TCP Connection(idle)" mag 06, 2013 10:51:17 AM ServerCommunicatorAdmin reqIncoming WARNING: The server has decided to close this client connection. java.lang.OutOfMemoryError: PermGen space Exception in thread "RMI TCP Connection(idle)" java.lang.OutOfMemoryError: PermGen space </code></pre> <p>I've tried to analyze this with VisualVm / EclipseMemory Analyzer, and this is what i get so far.</p> <p><img src="https://i.stack.imgur.com/1mZBS.png" alt="VisualVM screnshot with PermGen behaviour"></p> <p><img src="https://i.stack.imgur.com/diiBB.png" alt="GC Roots obtained from dominator tree analysis"></p> <p>The fact is that i don't observe this behaviour with another database (for example PostgreSQL or Hypersonic). Is there something related to Oracle that is causing the leak?</p> <p><a href="https://dl.dropboxusercontent.com/u/824575/leak.zip" rel="nofollow noreferrer">Here</a> is a zip archive containing roo script generator, anche the .hprof dump file.</p>
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