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From "Damon A. Brown (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-2081) NameSet does not propery implement equals(Object) method, causes ISM to fail merge check
Date Fri, 24 Apr 2009 04:29:36 GMT
NameSet does not propery implement equals(Object) method, causes ISM to fail merge check

                 Key: JCR-2081
                 URL: https://issues.apache.org/jira/browse/JCR-2081
             Project: Jackrabbit Content Repository
          Issue Type: Bug
          Components: jackrabbit-core
    Affects Versions: 1.5.4
         Environment: org.apache.jackrabbit.core.state.SharedItemStateManager:begin()
            Reporter: Damon A. Brown
            Priority: Critical

The merge context uses the NameSet.equals(NameSet) method to compare two sets; however, the
NameSet class does not override the default Object.equals(Object) method, and does not inherit
from AbstractSet<E>.  Therefore, the merge check fails, even though the mixin sets are
the same.  Object instance equivalence is being performed as opposed to set equivalence. 
Behavior is observed when more than one thread is checking the ISM at a given time.  Demonstration
code available upon request.

>From NodeStateMerger, line 83:
                // mixin types
                if (!state.getMixinTypeNames().equals(overlayedState.getMixinTypeNames()))
                    // the mixins have been modified but by just looking at the diff we
                    // can't determine where the change happened since the diffs of either
                    // removing a mixin from the overlayed or adding a mixin to the
                    // transient state would look identical...
                    return false;

Proposed solution:
- Implement NameSet.equals(...) method:
	public boolean equals(Object obj) {
		if (obj != null && obj instanceof NameSet) {
			NameSet oo = (NameSet) obj;
			return oo.names.equals(this.names);
		return false;

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