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-help-please-tp67458p67458.html > Sent from the Drools - User mailing list archive at Nabble.com. > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users