[rules-users] problem escaping quote in eval.

[samlotti]

Hello, 

I'm trying to construct a rule in drool V4 that contains an eval with a
literal string that may contain embedded quotes. I've tried escaping the
quote but get the error below.  Note that the \" works outside an eval. 

rule "evalList2" 
        when 
                Var( eval( "tt".equals("t\"t"))) 
        then 
                System.out.println( "evalList2" ); 
end 


Error: 
java.lang.NullPointerException: 
        at
org.drools.rule.PredicateConstraint.createContextEntry(PredicateConstraint.java:201) 
        at org.drools.reteoo.AlphaNode.createMemory(AlphaNode.java:230) 
           ... 

It looks like a change was made to V3 to fix this but doesnt appear to work
in V4, does anyone know how to construct this type of rule? 

Thanks in advance
Sam 

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