[jira] Created: (XMLBEANS-283) Creating new cursors for the same XmlObj and selecting paths leads to memory leak

["Tero Vuorela (JIRA)" <xm...@xml.apache.org>]

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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