Xerces consuming memory when reusing parser 2003-03-13 - By sandygao@(protected)
BTW, a memory leak bug related to attribute uses was fixed last Nov., which
should be included in 2.3.0. Is it possible that you are using an earlier
version? Thx.
Sandy Gao
Software Developer, IBM Canada
(1-905) 413-3255
sandygao@(protected)
Rob Griffin
<rob.griffin@(protected) To: xerces-j-user@(protected)
.apache.org
uest.com> cc:
Subject: Xerces consuming
memory when reusing parser
03/11/2003 08:31
PM
Please respond to
xerces-j-user
Hi,
I have a problem with Xerces 2.3.0 consuming memory in a long running
application.
Here's my setup code:
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance
();
factory.setValidating(true);
factory.setIgnoringComments(true);
factory.setNamespaceAware(true);
factory.setAttribute("
http://apache.org/xml/features/dom/defer-node-expansion", Boolean.FALSE);
factory.setAttribute("
http://xml.org/sax/features/external-parameter-entities", Boolean.FALSE);
factory.setAttribute("
http://apache.org/xml/features/validation/schema", Boolean.TRUE);
I am using an XML Schema for validation.
I then get one instance of DocumentBuilder from this factory and use it to
repeatedly validate documents.
Last night I ran it overnight with another process feeding in a small XML
document ( < 10 elements) every
ten seconds. This morning I see more than 260,000 instances of
org.apache.xerces.impl.xs.XSAttributeUseImpl.
Forcing a garbage collection does not free these objects. There are no
other objects with anywhere near this count.
The resulting document is being used to create a Java object, but in this
case that object is almost
immediately deferenced. I can see the count of that type fall to zero
periodically, which is what I expect.
Is this a bug? If so I can give more details about where these objects are
being allocated.
As a workaround I am now periodically creating a new DocumentBuilderFactory
and DocumentBuilder and this
fixes the problem, but I'd rather not have to do this.
Regards,
Rob Griffin
Software Engineer
Quest Software
2/293 Camberwell Road
Camberwell, Victoria 3124
Australia
Phone: +613 98118021
Fax: +613 9811 8099
http://www.quest.com
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