[jira] [Commented] (FOP-2525) [PATCH] Memory leak present when using Truetype Collection (.ttc)

["chunlinyao (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FOP-2525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15511781#comment-15511781 ] 

chunlinyao commented on FOP-2525:
---------------------------------

Is there any issue in this patch to prevent it be accepted? It really resolved memory leak. And is needed for CJK fonts.

> [PATCH] Memory leak present when using Truetype Collection (.ttc)
> -----------------------------------------------------------------
>
>                 Key: FOP-2525
>                 URL: https://issues.apache.org/jira/browse/FOP-2525
>             Project: FOP
>          Issue Type: Bug
>    Affects Versions: 2.0
>         Environment: At least Mac and Linux, both Oracle VM and OpenJDK
>            Reporter: Jeremy Smith
>            Priority: Minor
>         Attachments: FOP-2525.patch, FOP_patch_heap-usage.png
>
>
> When a TrueType Collection file is used to specify custom fonts, and a long-running FopFactory is used to create FOP instances to process many FO input documents, millions of org.apache.fop.complexscripts.fonts.GlyphPositioningTable$PairValues and org.apache.fop.complexscripts.fonts.GlyphPositioningTable$Values instances get created which are never collected.  Thus the heap continues to grow, leading to eventual GC thrashing or crash.
> When the same fonts are used, but extracted from the TTC file, the issue does not occur, and the instances of those classes are collected normally.
> The issue can be seen by repeatedly processing a document with a config.xml which specifies fonts inside of a Truetype Collection file.  Attaching VisualVM to such a process will show continuous heap growth and millions of aforementioned instances whose numbers never decrease.



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