SchemaService modifies attibute while checking for removal of last attribute value

• Key: DIRSERVER-256
• Type: Bug
• Status: Closed
• Resolution: Fixed
• Priority: Major
• Assignee: Alex Karasulu
• Reporter: Claus Turkalj
• Affects Version/s: pre-1.0
• Fix Version/s: 1.0-RC1

Description

The SchemaService is modifying an attribute although it is not the last interceptor in the interceptor chain. If one of the interceptors invoked after the SchemaService throws an exception, the modification has already been commited.

The modification happens while the SchemaService checks if a DirContext.REMOVE_ATTRIBUTE operation removes the last value of an attribute:

    private boolean isCompleteRemoval( Attribute change, Attributes entry ) throws NamingException
    {
        // if change size is 0 then all values are deleted then we're screwed
        if ( change.size() == 0 )
        {
            return true;
        }

        // can't do math to figure our if all values are removed since some
        // values in the modify request may not be in the entry. we need to
        // remove the values from a cloned version of the attribute and see
        // if nothing is left.
        Attribute changedEntryAttr = entry.get( change.getID() );
        for ( int jj = 0; jj < change.size(); jj++ )
        {
            changedEntryAttr.remove( change.get( jj ) );
        }

        return changedEntryAttr.size() == 0;
    }

Changing the line

        Attribute changedEntryAttr = entry.get( change.getID() );

to

        Attribute changedEntryAttr = entry.get( change.getID() ).clone();

seems to fix the problem.