Sebastian Millies created XERCESJ-1653:
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Summary: Memory leak with validating SAX Parser
Key: XERCESJ-1653
URL: https://issues.apache.org/jira/browse/XERCESJ-1653
Project: Xerces2-J
Issue Type: Bug
Components: SAX
Affects Versions: 2.11.0
Environment: Windows 7 Enterprise, JDK 1.8.0_25
Reporter: Sebastian Millies
Priority: Critical
Attachments: SAXMemoryUsage.java
I'm parsing a very large XML file with org.apache.xerces.parsers.SAXParser and
validation turned on. The file contains 25 million elements of the form
specified in the attached DTD's, in total it is ca. 7 GB large.
Heap monitoring with jvisualvm shows millions of QName instances being cached
and not being garbage collected.
Turning off validation makes the problem disappear.
I have tested a numer of other parsers (Crimson, Aelfred2, Resin, Woodstox).
With Woodstox, for example, I can process my 7 GB file (including validation)
with just 64MB of heap. With Xerces, 1024MB of heap do not suffice.
I'll attach a small diagnosis program (SAXMemoryUsage.java) that shows that
Xerces heap consumption increases inordinately.
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