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From "Michael Dick (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-1906) Issue info / warning message when connection retain mode is always
Date Wed, 15 Dec 2010 16:16:05 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-1906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12971724#action_12971724
] 

Michael Dick commented on OPENJPA-1906:
---------------------------------------

The change has been committed to trunk under revision 1045397. My typo in the commit message
prevents it from linking here. 

> Issue info / warning message when connection retain mode is always
> ------------------------------------------------------------------
>
>                 Key: OPENJPA-1906
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1906
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: logging
>    Affects Versions: 2.2.0
>            Reporter: Michael Dick
>            Assignee: Michael Dick
>            Priority: Minor
>             Fix For: 2.2.0
>
>
> Many users see better performance when setting openjpa.ConnectionRetainMode to always.
But they might not be aware of the consequences - the EntityManager must be closed in order
to release the connection. 
> In the case of application managed entity managers, the application should always close
the EntityManager when it's done. But since this may or may not be obvious, it's a good idea
to log an info message. 
> In the case where the application cannot directly close the EntityManager (e.g. a Container
Managed EntityManager), we should log a warning to let users know that each EntityManager
may hold on to a connection for a long time. 
> Unfortunately we can only detect whether the EMF is container managed, not the EM - but
some warning is better than none. 

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