Jeremy Smith created FOP-2525:
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Summary: 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
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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