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From "Archie Cobbs (JIRA)" <j...@apache.org>
Subject [jira] Commented: (IVY-791) Memory leak in ModuleRevisionId.java
Date Fri, 04 Apr 2008 20:09:24 GMT

    [ https://issues.apache.org/jira/browse/IVY-791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12585737#action_12585737
] 

Archie Cobbs commented on IVY-791:
----------------------------------

Sorry, I said that backwards speaking of key vs. value.

It's the strong reference to the _value_ that causes the weak reference to the _key_ to never
be cleared.

The fix is to wrap the values (not the keys) in WeakReferences.


> Memory leak in ModuleRevisionId.java
> ------------------------------------
>
>                 Key: IVY-791
>                 URL: https://issues.apache.org/jira/browse/IVY-791
>             Project: Ivy
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.0.0-beta-2
>            Reporter: Archie Cobbs
>
> In ModuleRevisionId.java an attempt is made to create a "canconical instance" cache like
{{String.intern()}} using this static field:
> {noformat}
> private static final Map/*<ModuleRevisionId, ModuleRevisionId>*/ CACHE = new WeakHashMap();
> {noformat}
> This doesn't work: each entry is both a key and a value, so the strong reference to the
key will never allow the weak reference to the value to be the only remaining reference, and
so entries will never be dropped.
> You have to wrap the keys in a WeakReference.
> See [Classpath's implementation of String.intern()|http://cvs.savannah.gnu.org/viewvc/classpath/vm/reference/java/lang/VMString.java?root=classpath&view=markup]
for an example.

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