[rules-users] RuleBase Question
Hello,
I have two questions. Hopefully they are very simple:
1. If I wanted to dynamically update a package in the RuleBase because I
found out that the drl was updated on disk, can I just do this:
ruleBase.addPackage(myPackage);
And this will automatically replace (remove the old one, and add the new
one)? Or do I have to implicitly first remove the existing one and THEN add
the modified one again?
I have the following code:
if (ruleBase.getPackage(onePackage.getName()) != null) {
ruleBase.removePackage(onePackage.getName());
}
ruleBase.addPackage(onePackage);
Is this a code practice to do?
2. My second question is, the statement above in the body of the IF block,
threw the following exception:
Exception in thread "AdminHandler_0_123877285495354"
java.lang.NullPointerException
INFO|7032/0|10-06-10 13:43:55| at
org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java:235)
INFO|7032/0|10-06-10 13:43:55| at
org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java:413)
INFO|7032/0|10-06-10 13:43:55| at
org.drools.common.AbstractRuleBase.removeRule(AbstractRuleBase.java:729)
INFO|7032/0|10-06-10 13:43:55| at
org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java:657)
INFO|7032/0|10-06-10 13:43:55| at [statement in the IF block above]
Any ideas why that is?
Thanks.
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