[rules-users] RuleBase Question

[Moe Alkhafaji]

Thanks Esteban,

1. I will try that.

2. No, I did not use queries. They are just rules that use functions in my
fact object.

2010/6/11 Esteban Aliverti <esteban.aliverti at gmail.com>

> Hi,
>
> 1. If you want to dynamically update your kbase whenever your resources
> (DRL, PKG, etc) change, you could use Knowledge Agent. Take a look at the
> documentation. The KAgent basically makes what you are trying to do. On
> thing you must to take care (whether you are using KAgent or not) is that
> whenever you modify a kbase you must rebuild all your sessions (unless they
> were stateless, of course).
>
> 2. Does the package you are trying to remove contains queries definitions?
> I filled a jira issue some time ago (
> https://jira.jboss.org/browse/JBRULES-2374) reporting this problem.
>
> Best,
>
>
> On Thu, Jun 10, 2010 at 9:43 PM, malkhafaji <moe.alkhafaji at medcpu.com>wrote:
>
>>
>> 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.
>> --
>> View this message in context:
>> http://drools-java-rules-engine.46999.n3.nabble.com/RuleBase-Question-tp887326p887326.html
>> Sent from the Drools - User mailing list archive at Nabble.com.
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>
>
>
> --
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
>
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>


-- 
Moe Alkhafaji
Chief Technology Officer, MedCPU
Phone: (630) 290-1113
Email: cto at medcpu.com

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