[jira] Issue Comment Edited: (WW-2167) Memory leak when app stopped

["Nicolas Raynaud (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/struts/browse/WW-2167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43015#action_43015 ] 

nraynaud edited comment on WW-2167 at 1/16/08 4:43 PM:
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I've spent a few hours on this issue, looking at memory snapshots. My finding seems to be an ActionContext tied to a ThreadLocal (every route I checked in memory lead to an ActionContext in a ThreadLocal).

The problem is that I can't find any code path leading to an exit of the request leaving an ActionContext in the threadlocal to pin a bug.

As a side note : you HAVE TO unregister manually the JDBC driver, spring doesn't do it.

      was (Author: nraynaud):
    I've spent a few hours on this issue, looking at memory snapshots. My finding seems to be an ActionContext tied to a ThreadLocal (every route I checked in memory lead to an ActionContext in a ThreadLocal).

The problem is that I can't find any code path leading to an exit of the request leaving an ActionContext in the threadlocal to pin a bug.
  
> Memory leak when app stopped
> ----------------------------
>
>                 Key: WW-2167
>                 URL: https://issues.apache.org/struts/browse/WW-2167
>             Project: Struts 2
>          Issue Type: Bug
>    Affects Versions: 2.0.9
>         Environment: WebSphere 6.1.0.9 (non-network deploy) on Windows XP Professional
> java version "1.5.0"
> Java(TM) 2 Runtime Environment, Standard Edition (build pwi32devifx-20070608 (SR5+IY99712))
> IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 Windows XP x86-32 j9vmwi3223-20070426 (JIT enabled)
> J9VM - 20070420_12448_lHdSMR
> JIT  - 20070419_1806_r8
> GC   - 200704_19)
> JCL  - 20070608
>            Reporter: Adam Crume
>             Fix For: 2.1.2
>
>
> Struts 2 somehow prevents the app's classes from being garbage collected when the application is stopped or undeployed.
> I created a barebones Struts 2 app with an action with the following code:
> 	private static final Object x = new Object() {
> 		{
> 			System.out.println("================== Object created: " + hashCode() + " ===================");
> 		}
> 		protected void finalize() throws Throwable {
> 			System.out.println("**************** Object finalized: " + hashCode() + " *********************");
> 		};
> 	};
> Because of this static field, a message should be printed when the class is initialized and when it is garbage collected.  "Object created" would be printed out whenever I went to the action for the first time, but restarting the app never printed "Object finalized."  This is not an issue with garbage collection in my web container because doing the same thing with a servlet resulted in both messages being printed.
> One problem is that the FilterDispatcher.init() method sets a ThreadLocal but never clears it.  I fixed that by adding ActionContext.setContext(null); to the end of the init() method, but that didn't solve the larger problem.

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