title: Tomcat 6 fails on context reload
body: <p>Since some days I am facing problems when my tomcat reloads the context. In most cases it works, in some cases it fails. I get the following error:</p>
  
  <pre><code>30.04.2011 22:52:16 org.apache.catalina.loader.WebappClassLoader modified
  SCHWERWIEGEND:     Resource '/WEB-INF/classes/com/sample/ContextLoaderListener.class' is missing
  30.04.2011 22:52:16 org.apache.catalina.core.StandardContext reload
  INFO: Reloading this Context has started
  30.04.2011 22:52:16 org.apache.catalina.core.ApplicationContext log
  INFO: Destroying Spring FrameworkServlet 'application'
  2011-04-30 22:52:16,456 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] 7780618 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] (AbstractApplicationContext.java:1002) INFO   - Closing WebApplicationContext for namespace 'application-servlet': startup date [Sat Apr 30 20:42:35 CEST 2011]; parent: Root WebApplicationContext
  2011-04-30 22:52:16,460 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] 7780622 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] (DefaultSingletonBeanRegistry.java:422) INFO   - Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@6684b1e0: defining beans parent: org.springframework.beans.factory.support.DefaultListableBeanFactory@7f6b321b
  30.04.2011 22:52:16 org.apache.catalina.session.StandardManager doUnload
  SCHWERWIEGEND: IOException while saving persisted sessions: java.io.FileNotFoundException: C:\dev\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp3\work\Catalina\localhost\_\SESSIONS.ser (Das System kann den angegebenen Pfad nicht finden)
  java.io.FileNotFoundException: C:\dev\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp3\work\Catalina\localhost\_\SESSIONS.ser (Das System kann den angegebenen Pfad nicht finden)
      at java.io.FileOutputStream.open(Native Method)
      at java.io.FileOutputStream.&lt;init&gt;(FileOutputStream.java:179)
      at java.io.FileOutputStream.&lt;init&gt;(FileOutputStream.java:70)
      at org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:489)
      at org.apache.catalina.session.StandardManager$PrivilegedDoUnload.run(StandardManager.java:89)
      at java.security.AccessController.doPrivileged(Native Method)
      at org.apache.catalina.session.StandardManager.unload(StandardManager.java:452)
      at org.apache.catalina.session.StandardManager.stop(StandardManager.java:667)
      at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4611)
      at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3222)
      at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:403)
      at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1309)
      at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
      at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
      at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
      at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
      at java.lang.Thread.run(Thread.java:662)
  30.04.2011 22:52:16 org.apache.catalina.session.StandardManager stop
  SCHWERWIEGEND: Exception unloading sessions to persistent storage
  java.io.FileNotFoundException: C:\dev\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp3\work\Catalina\localhost\_\SESSIONS.ser (Das System kann den angegebenen Pfad nicht finden)
      at java.io.FileOutputStream.open(Native Method)
      at java.io.FileOutputStream.&lt;init&gt;(FileOutputStream.java:179)
      at java.io.FileOutputStream.&lt;init&gt;(FileOutputStream.java:70)
      at org.apache.catalina.session.StandardManager.doUnload(StandardManager.java:489)
      at org.apache.catalina.session.StandardManager$PrivilegedDoUnload.run(StandardManager.java:89)
      at java.security.AccessController.doPrivileged(Native Method)
      at org.apache.catalina.session.StandardManager.unload(StandardManager.java:452)
      at org.apache.catalina.session.StandardManager.stop(StandardManager.java:667)
      at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4611)
      at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3222)
      at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:403)
      at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1309)
      at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
      at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
      at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
      at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
      at java.lang.Thread.run(Thread.java:662)
  </code></pre>
  
  <p>As you can see I wrote my own ServletContextListener which is not found by tomcat. I am using Eclipse WST for development.</p>
  
  <p>Thanks for any useful hint!</p>