Re: [rules-users] Property Navigation

Thanks Michael, I simulate.. your rule fire with successful. I discovered the problem. The object in property (like Foo in your example), when null, it's not throws NullPointerException, but "org.mvel.PropertyAccessException: unable to resolve property". With that, I never imagined that the problem was nullPointer, but I thought about any access visibility (duh!). []'s Alessandro Glad it is working for you now, looks like I have to be more patient when posting to this board as I seem to have junked the thread up a bit lol Michael B. escreveu: > Okay, I wrote a test case around the following and it works fine so let > me > know if this isnt what you are working with... > > Foo Class > > public class Foo { > > private String m_name; > > public String getName() > { > return m_name; > } > > public void setName(String nm) > { > m_name = nm; > } > > } > > > Bar Class > > public class Bar { > > private Foo m_foo; > > public Foo getFoo() > { > return m_foo; > } > > public void setFoo(Foo f) > { > m_foo = f; > } > > public String toString() > { > return "I have a foo with a name of " + m_foo.getName(); > } > > } > > DRL Rule > > rule "FooBar Rule" > > when > $bar : Bar( foo.name != "Wrong" ) > then > System.out.println("Test Successful - " + $bar.toString()); > > end > > > Junit Test Case > > public void testProperties() > { > try > { > final Reader source = new InputStreamReader( > FooBarTest.class.getResourceAsStream( "FooBar.drl" ) ); > RuleBase ruleBase = RuleBaseFactory.newRuleBase(); > PackageBuilder builder = new PackageBuilder(); > > builder.addPackageFromDrl(source); > > if ( builder.hasErrors() ) { > System.out.println( builder.getErrors().toString() ); > throw new RuntimeException( "Unable to compile > \"FooBar.drl\"."); > } > > //get the compiled package (which is serializable) > final Package pkg = builder.getPackage(); > > //add the package to a rulebase (deploy the rule package). > ruleBase.addPackage( pkg ); > final StatefulSession session = > ruleBase.newStatefulSession(); > > Foo foo = new Foo(); > foo.setName("Test"); > Bar bar = new Bar(); > bar.setFoo(foo); > session.insert(bar); > > session.fireAllRules(); > } > catch (Exception e) > { > System.out.println(e.getMessage()); > e.printStackTrace(); > fail(e.getMessage()); > } > > } > > > > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users