Ran into this working on contrib/javaUsagesNavigator:

I have the Action you see below for opening a class member when the user double
clicks.  It works fine except in one case:

I have two copies of A.java - one in the project it really lives in;  the other
is a copy in another project full of junk for testing - its classes are not
resolvable, etc., but it works to test simple things and to make sure behavior
is good when there are unresolvable classes.

I am editing the valid version of A.java.  I expand usages of some method.  One
usage is in an anonymous inner class.  For *those* usages, the getDataObject()
code below returns the wrong copy of A.java - so double clicking takes me to the
invalid version.  Works fine for non-anonymous references.  The culprit code
that is returning the wrong FileObject is:
        Resource r = member.getResource();
        FileObject fob = JavaModel.getFileObject(r);

Don't know if it causes a problem for anything but my module, but I thought it
might.


    private static final class OC extends AbstractAction {
        private ClassMember member;
        public OC (ClassMember member) {
            this.member = member;
            putValue (Action.NAME, "Go To Source"); //XXX I18N
        }
    
        public void actionPerformed(ActionEvent ae) {
            try {
                DataObject d = getDataObject(member);
                if (d != null) {
                    PositionBounds bounds =
JavaMetamodel.getManager().getElementPosition(member);
                    if (bounds != null) {
                        JavaEditor ed = ((JavaEditor)
d.getCookie(JavaEditor.class));
                        ed.openAtPosition(bounds.getBegin());
                        return;
                    }
                }
            } catch (javax.jmi.reflect.InvalidObjectException e) {
            }
            Toolkit.getDefaultToolkit().beep();
        }
    }
    
    private static final DataObject getDataObject(ClassMember member) {
        Resource r = member.getResource();
        FileObject fob = JavaModel.getFileObject(r);
        if (fob != null && fob.isValid()) {
            try {
                return DataObject.find (fob);
            } catch (DataObjectNotFoundException donfe) {
                //do nothing
            }
        }
        return null;
    }