Creating new cursors for the same XmlObj and selecting paths leads to memory
leak
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Key: XMLBEANS-283
URL: http://issues.apache.org/jira/browse/XMLBEANS-283
Project: XMLBeans
Issue Type: Bug
Components: Cursor
Affects Versions: Version 2.2
Environment: Java 1.4.2_10, Windows XP
Reporter: Tero Vuorela
Priority: Minor
I have a reference to XmlObject that I like to keep while my application is
running. During run new cursor for the XmlObject is created many times and
selectPath(..) is called for the cursor. I call dispose() when I'm finished
with the cursor. However using a profiler I can see that Cursor object are not
garbage collected. If XmlObject would be unreferenced then all cursors would be
garbage collected.
Here is an example code:
public class XmlBeansTest
{
public static void main( String[] args )
throws Exception
{
XmlObject xmlObj = XmlObject.Factory.parse( "<test>foobar</test>" );
while ( true )
{
// if xmlObj would be created here then there wouldn't any leak
//XmlObject xmlObj = XmlObject.Factory.parse(
"<test>foobar</test>" );
XmlCursor cursor = xmlObj.newCursor();
cursor.selectPath( "*" );
// in this example case we don't do anything for selected elements
cursor.dispose();
}
}
}
Above code results to increasing amount of Cursor objects. If xmlObj is
created inside loop there would be any problem.
Checking the code it seems that ChangeListener structure is Cursor and Locale
classes keep references alive. The problem occurs if selectPath() is called
because _selectPath calls Locale.registerForChange(..) that builds up
ChangeListener "linked list".
I wonder if it could be possible to clear _nextChangeListener when calling
dispose() or some other way to tear down ChangeListener structure. I'm not
familiar with XmlBeans code so I don't know what could be side effects of that
change.
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