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From: "Thomas Neidhart (JIRA)" <jira@apache.org>
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 <JIRA.12769730.1422041397562@arcas>
Subject: [jira] [Commented] (POOL-283) 'Object has already been retured to
 this pool or is invalid' for collections
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    [ https://issues.apache.org/jira/browse/POOL-283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14307819#comment-14307819 ] 

Thomas Neidhart commented on POOL-283:
--------------------------------------

Using an IdentityHashMap would not require such wrapper objects.

> 'Object has already been retured to this pool or is invalid' for collections
> ----------------------------------------------------------------------------
>
>                 Key: POOL-283
>                 URL: https://issues.apache.org/jira/browse/POOL-283
>             Project: Commons Pool
>          Issue Type: Bug
>    Affects Versions: 2.2
>            Reporter: Valentin Mayamsin
>
> This test throws exception:
> {code}
>  GenericObjectPoolConfig config = new GenericObjectPoolConfig ();
>         config.setMaxTotal ( 2 );
>         GenericObjectPool<Set> setsPool = new GenericObjectPool<> ( new BasePooledObjectFactory<Set> ()
>         {
>             @Override
>             public Set create () throws Exception
>             {
>                 return new HashSet();
>             }
>             @Override
>             public PooledObject<Set> wrap ( Set o )
>             {
>                 return new DefaultPooledObject<> ( o );
>             }
>             @Override
>             public void passivateObject ( PooledObject<Set> p ) throws Exception
>             {
>                 p.getObject ().clear ();
>                 super.passivateObject ( p );
>             }
>         }, config );
>         final Set set1 = setsPool.borrowObject ();
>         final Set set2 = setsPool.borrowObject ();
>         setsPool.returnObject ( set1 );
>         setsPool.returnObject ( set2 ); // this throws java.lang.IllegalStateException: Object has already been retured to this pool or is invalid
> {code}



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