The consequence will be null if the java you used is invalid. When you create the Package check the errors before adding it to the rule base as you can get a lot more info. In fact thats good "best practice" always verify that the package errors are emtpy before attempting to use the package.

Mark
Manukyan, Sergey wrote:

Hi,

I am using JBoss Rules 4.0.0.11754MR2 in an RAD 7.0 (Eclipse 3.2) environment.

Cannot make it work, even examples…

Here is a message produces on all rules: The rule called <here goes rule name> is not valid. Check for compile errors reported.

Here is a full stack trace:

Exception in thread "main" java.lang.IllegalArgumentException: The rule called Hello World is not valid. Check for compile errors reported.

      at org.drools.common.AbstractRuleBase.addRule(AbstractRuleBase.java:363)

      at org.drools.reteoo.ReteooRuleBase.addRule(ReteooRuleBase.java:263)

      at org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java:293)

      at org.drools.examples.HelloWorldExample.readRule(HelloWorldExample.java:72)

      at org.drools.examples.HelloWorldExample.main(HelloWorldExample.java:21)

After digging it further I found that in Rule class method isValid is being called defiend as followes:

    public boolean isValid() {

        if ( this.consequence == null || !isSemanticallyValid() ) {

            return false;

        }

        return true;

    }

The debugger shows that this.consequence is null always! So rules are always not valid.

Anyone saw this problem? Any idea how to resolve it?

Thanks a lot!

-Sergey

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