[jira] Commented: (XALANJ-1999) Memory leak from DTMManager

["Morris Kwan (JIRA)" <xa...@xml.apache.org>]

     [ http://nagoya.apache.org/jira/browse/XALANJ-1999?page=comments#action_55751 ]
     
Morris Kwan commented on XALANJ-1999:
-------------------------------------

Reviewed by Christine Li (jycli@ca.ibm.com).

> Memory leak from DTMManager
> ---------------------------
>
>          Key: XALANJ-1999
>          URL: http://nagoya.apache.org/jira/browse/XALANJ-1999
>      Project: XalanJ2
>         Type: Bug
>   Components: DTM
>     Versions: 2.6
>     Reporter: Morris Kwan
>     Assignee: Morris Kwan
>  Attachments: 1999.patch
>
> Similar to bug 1844, this problem also became
> evident after the introduction of XMLReaderManager. The leak
> described by 1844 is an incremental leak, where the leaked memory
> increases over time, eventually resulting in an out-of-memory error.
> The leak here is less serious. Only one DTM is leaked per thread. In
> most cases it is unlikely to cause an out-of-memory error. 
> The problem:
> XMLReaderManager maintains a pool of XMLReaders and tries to reuse
> them across transformations. An XMLReader has references to the DTM
> objects because we call the XMLReader.setContentHandler/setDTDHandler/
> setErrorHandler methods in DTMManagerDefault. The references are not
> released after the tranformation is done. Therefore an active XMLReader
> always has reference to the last DTM it created. In multi-thread
> scenarios, we might use multiple XMLReaders, where each thread leaks its
> own DTM, adding up to a bigger total leak.

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