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 -- View this message in context: http://www.nabble.com/problem-escaping-quote-in-eval.-tp19254011p19254011... Sent from the drools - user mailing list archive at Nabble.com.