From: CK <chrisckc(a)gmail.com&gt; Subject: Re: [rules-users] Trivial rule with condition in RHS won't compile, help please To: "Rules Users List" <rules-users(a)lists.jboss.org&gt; Date: Thursday, December 3, 2009, 1:49 PM I would assume that you're trying to test out rule writing and see  what works and what doesn't.   I don't believe you can use if  statements in the RHS. Normally, anytime you want to use "if" statements inside the RHS, it's  a sure sign that you should move it to the LHS and create separate  rules. You can actually make your rule even simpler: rule "test" dialect "mvel" when    //empty LHS automatically implies true then    System.out.pritln("***") end Cheers, Chris On Dec 3, 2009, at 11:43 AM, Barry Kaplan wrote: > > The following rule: > > rule "test" dialect "mvel" > when >    eval(true) > then >    if (true) { >        System.out.println("***") >    } > end > > Fails with: > > java.lang.RuntimeException: Unable to build expression for  > 'consequence': > was expecting type: java.lang.Object; but found type: void '    if  > (true) { >        System.out.println("***") >    } >    true > ' : [Rule name='test'] > > I can't for the live of me figure out what mvel is bitching about. > > Note that the following does compile: > > rule "test" dialect "mvel" > when >    eval(true) > then > //    if (true) { >        System.out.println("***") > //    } > end > -- > View this message in context: http://n3.nabble.com/Trivial-rule-with-condition-in-RHS-won-t-compile-hel... > Sent from the Drools - User mailing list archive at Nabble.com. > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > 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

From: Barry Kaplan <groups1(a)memelet.com&gt; Subject: Re: [rules-users] Trivial rule with condition in RHS won't compile, help please To: rules-users(a)lists.jboss.org Date: Thursday, December 3, 2009, 2:07 PM Greg Barton wrote: > > You can use them in the RHS, but just with java dialect. > This is inconsistent. If they can be used in java, then they should not be disabled for mvel. -- View this message in context: http://n3.nabble.com/Trivial-rule-with-condition-in-RHS-won-t-compile-hel... Sent from the Drools - User mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users