[ http://issues.apache.org/jira/browse/XALANJ-2171?page=all ]
Nicolas Bonmariage updated XALANJ-2171:
---------------------------------------
Attachment: graph_3.png
> Memory leak in case of concurrent access to Templates object
> ------------------------------------------------------------
>
> Key: XALANJ-2171
> URL: http://issues.apache.org/jira/browse/XALANJ-2171
> Project: XalanJ2
> Type: Bug
> Components: transformation
> Versions: 2.6, 2.4
> Environment: JBoss 3.2.6 AS, JDK 1.4.2, Windows 2000
> Reporter: Nicolas Bonmariage
> Priority: Critical
> Attachments: graph_3.png, historicOperationsNotConsolidated.xsl, report.xml,
> report.xsl
>
> I use Xalan/Xerces to perform FOP processing inside a J2EE application.
> I recently introduced the use of Templates object as a performance
> optimization.
> As the spec says Templates objects have to thread safe, I used it as static
> field from which I creates Transformer objects.
> Note that each thread receives its own Transformer object, so the use seems
> correct regarding threading issues.
> However I noticed thereafter a memory leak inside the AS in case of important
> load.
> Using a profiling tool, I saw TransformerImpl objects (and the associated
> object graph) filling up the memory.
> The root to the GC showed references from the static Templates field.
> I observed this phenomenon wih Xalan 2.4.1 but upgrading to version 2.6 did
> not help.
> The reference graph shows something like :
> StylesheetRoot (static) -> Vector[ElemTemplate] -> ... -> SAX2DTM ->
> TransformerImpl
> I can attach the full graph if needed.
> I saw related issues talking about Iterator objects keeping references and
> there are indeed Iterator objects involved in the reference graph.
> But in my case this shows up only in the case of an heavily threaded
> environment.
> Anyway, the result is an application server whose memory is filled up and
> unusable.
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