OK after jumping through some hoops to get development mode working, I found the problem. Class org.drools.guvnor.client.modeldriven.ui.ActionValueEditor has a method showTypeChoice(Widget w) which has a variable (FactPattern factPattern) used in an if-clause without a null check. The variable was coming back null and blowing up with a NPE, hence the icon didn't work. I noticed things are uneven in the code regarding null-checks by callers of the function org.drools.ide.common.client.modeldriven.brl.RuleModel.getBoundFact(final String var) - might be something to look at. --- On *Fri, 9/17/10, Scott Mayne /&lt;smayne(a)webfinancialsolutions.com&gt;/* wrote: From: Scott Mayne <smayne(a)webfinancialsolutions.com&gt; Subject: [rules-users] Guvnor 5.1: Pencil icon not clickable in BRL editor‏ To: rules-users(a)lists.jboss.org Date: Friday, September 17, 2010, 1:47 PM Hi all, I'm reading Paul Browne's "JBoss Drools Business Rules" and in Ch. 5 we make a BRL in the guided editor. We're using a simple fact model with a single class (Sales) which has (among others) a field "sales", type long. The book uses an earlier version of Guvnor so things look a little different but everything's worked so far, until I use the editor to make a rule that looks like this in "view source": rule "SalesDiscount" dialect "mvel" when mySales : Sales( salesValue : sales >= "100" ) then mySales.setSales( salesValue-10 ); update( mySales ); end When I try it out, I get this line in the THEN section "1. Modify value of Sales [mySales] sales [pencil icon] [remove icon] but neither "sales" nor the pencil icon is clickable, so I can't enter what it should change to. When click view source using what I could do I get: rule "SalesDiscount" dialect "mvel" when mySales : Sales( salesValue : sales >= "100" ) then mySales.setSales( ); mySales.setWait( ); update( mySales ); end [I added the "wait" because the modify field dropdown has this as an option but it's not in the Java class and I'm not sure where it came from.] Can anyone shed light on this behavior? I'm using the latest version of Firefox, compiling with GWT/building my own EAR (though I haven't done any code changes) using RAD 7.5.5.1 (based on Eclipse 3.4), and am running Guvnor on WebSphere. -----Inline Attachment Follows----- _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org </mc/compose?to=rules-users(a)lists.jboss.org&gt; https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users