2010/4/21 Piotr Jedrychowski <pjedrychowski@proximetry.pl>

Hello.

I have a problem with removing knowledge packages. During running this
source code
Collection<KnowledgePackage> knowledgePackages =
knowledgeBase.getKnowledgePackages();
if (knowledgePackages != null) {
    List<String> packageNames = new ArrayList<String>();
    for (KnowledgePackage singlePackage : knowledgePackages) {
        packageNames.add(singlePackage.getName());
    }

    for (String singlePackageName : packageNames) {
        knowledgeBase.removeKnowledgePackage(singlePackageName);
    }
}

I'm getting NullPointerException with this StackTrace:
java.lang.NullPointerException
 at org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java:235)
 at org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java:366)
 at
org.drools.common.AbstractRuleBase.removeRule(AbstractRuleBase.java:712)
 at
org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java:640)
 at
org.drools.impl.KnowledgeBaseImpl.removeKnowledgePackage(KnowledgeBaseImpl.java:166)

I found this links in Internet:
http://seamframework.org/Community/DroolsGuvnorCacheIssue
http://lists.jboss.org/pipermail/rules-users/2007-November/003917.html

Maybe someone had similar problem and could help me?

I'm using:
* JBoss 4.2.3.GA
* Drools 5.0

Regards,
Piotr
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