[rules-users] NullPointerException during removing knowledge packages
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