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From "Adam Crume (JIRA)" <j...@apache.org>
Subject [jira] Commented: (WW-2167) Memory leak when app stopped
Date Thu, 01 Nov 2007 19:26:41 GMT

    [ https://issues.apache.org/struts/browse/WW-2167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_42506
] 

Adam Crume commented on WW-2167:
--------------------------------

As further proof, I added a static field:
private static final byte[] data = new byte[1024 * 1024 * 10]; // 10 megabytes

This was added to the servlet and to the action.  If I visited the servlet, restarted its
project, visited the servlet, restarted its project, etc., memory usage remained stable. 
If I did the same thing with the action, memory usage went up by 10 megabytes every time I
restarted the project and visited the action.

> 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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