Samuel Brezáni created XALANJ-2600:
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Summary: Memory leak in TransformerIdentityImpl
Key: XALANJ-2600
URL: https://issues.apache.org/jira/browse/XALANJ-2600
Project: XalanJ2
Issue Type: Bug
Security Level: No security risk; visible to anyone (Ordinary problems in
Xalan projects. Anybody can view the issue.)
Components: Xalan
Affects Versions: 2.7.2
Reporter: Samuel Brezáni
Assignee: Steven J. Hathaway
Hi.
I found a serious memory leak in the Xalan library. It is caused by the
org.apache.xalan.transformer.TransformerIdentityImpl class.
I try to explain mechanism how the memory leak is caused:
Web application is deployed on SAP NetWeaver AS with Java 1.6 (1.6.0_95). The
application uses Spring WS library but also another libraries with dependency
to Xalan library.
When the web service is invoked, then the TransformerIdentityImpl class is
used. This class is used because it's extends javax.xml.transform.Transformer
and it is created by Java core method -
javax.xml.transform.TransformerFactory.newInstance().
A class com.sun.xml.internal.messaging.saaj.soap.EnvelopeFactory is used for
handling web services. This object also contains cache (ParserPool) with
SAXParser objects (com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl). As
key for this cache is used an application class loader.
EnvelopeFactory object and SAXParserImpl objects are loaded by a system class
loader, but TransformerIdentityImpl class is loaded by an application class
loader.
During handling of web service a method
org.apache.xalan.transformer.TransformerIdentityImpl.transform(Source, Result)
is invoked. This method uses SAXParser as a reader. Problem is that this method
register self for handling properties (eg:
"http://xml.org/sax/handlers/DeclHandler";) but after processing method doesn't
unregister self from SAXParser. It means that objects loaded by the system
class loaded has dependencies on objects loaded by the application class loader.
Objects are still loaded after application is undeployed because cached
SAXParser references TransformerIdentityImpl.
I prepared very simple patch to fix this problem. In the attachment is also
picture which demonstrates situation.
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