[MNG-7194] PluginParameterExpressionEvaluator incorrectly interpolates unknown subexpression

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: Inheritance and Interpolation
• Assignee: Unassigned
• Reporter: Robert Scholte
• Created: 24/Jul/21 15:49
• Updated: 16/Jul/24 21:49

Description

The PluginParameterExpressionEvaluator evaluate(String,Class)-method ends like this:

        if ( value instanceof String )
        {
            // TODO: without #, this could just be an evaluate call...
            String val = (String) value;
            int exprStartDelimiter = val.indexOf( "${" );
            if ( exprStartDelimiter >= 0 )
            {
                if ( exprStartDelimiter > 0 )
                {
                    value = val.substring( 0, exprStartDelimiter ) + evaluate( val.substring( exprStartDelimiter ) );
                }
                else
                {
                    value = evaluate( val.substring( exprStartDelimiter ) );
                }
            }
        }

Assume that pre${unknown} needs to be evaluated and unknown does not exist, the result well be "prenull"

Just ${unknown} evaluates to null, but because there's no String concat it will be a real null.

Issue Links

• causes: MENFORCER-363 Unexpected result from requireProperty with regex when the property is not fully resolved
• links to: GitHub Pull Request #1570
• links to: GitHub Pull Request #1571
• links to: GitHub Pull Request #1573
• links to: GitHub Pull Request #1574