[jboss-jira] [JBoss JIRA] (DROOLS-1158) NullpointerException when trying to reuse KnowledgePackage into a new KnowledgeBase

[Juan Carlos Garcia (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-1158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268000#comment-13268000 ] 

Juan Carlos Garcia commented on DROOLS-1158:
--------------------------------------------

After going thru the DOC, it seems the KieScanner is not an option as we don't deploy our DTables withing jar files, they are access thru WebDav.

Regardless we have started to make the necessary changes to get rid of the OLD API and just uses the new KIE interfaces and factories for bootstrapping.

Thanks

> NullpointerException when trying to reuse KnowledgePackage into a new KnowledgeBase
> -----------------------------------------------------------------------------------
>
>                 Key: DROOLS-1158
>                 URL: https://issues.jboss.org/browse/DROOLS-1158
>             Project: Drools
>          Issue Type: Bug
>    Affects Versions: 6.3.0.Final, 6.4.0.Final
>            Reporter: Juan Carlos Garcia
>            Assignee: Matteo Mortari
>         Attachments: drools-reusepackage.tar, screenshot-1.png
>
>
> Having a set of DecisionTables which KnowledgePackages are cached in our application, after we detect a change in any of those XLS files, we build a KnowledgePackages from it, and then try to create a new KnowledgeBase with the new KnowledgePackages + the rest of the cached one that that were not modified, but it fails with a NPE internally in Drools (6.3.0 and 6.4.0)
> This is not a problem for the drools version (6.0.1.Final) that we currently uses using in production.
> After debugging and putting a breakpoint into the *MvelConstraint.java:619*,  it shows that it is trying to look for a packageName which hasn't being loaded yet in the new kbase (but belong to others XLS).
> I have attached a project with a testcase that shows the problem, it has 2 DecisionTable which i had to cut down a little bit (from our real files) and removes some sensitive information (replacing some of text with FOO-BAR).
> {code}
> java.lang.NullPointerException
>         at org.drools.core.rule.constraint.MvelConstraint.equals(MvelConstraint.java:619)
>         at org.drools.core.reteoo.AlphaNode.internalEquals(AlphaNode.java:199)
>         at org.drools.core.common.BaseNode.thisNodeEquals(BaseNode.java:194)
>         at org.drools.core.reteoo.CompositeObjectSinkAdapter.getMatchingNode(CompositeObjectSinkAdapter.java:531)
>         at org.drools.core.reteoo.builder.BuildUtils.attachNode(BuildUtils.java:121)
>         at org.drools.core.reteoo.builder.PatternBuilder.buildAlphaNodeChain(PatternBuilder.java:332)
>         at org.drools.core.reteoo.builder.PatternBuilder.attachAlphaNodes(PatternBuilder.java:313)
>         at org.drools.core.reteoo.builder.PatternBuilder.attachPattern(PatternBuilder.java:130)
>         at org.drools.core.reteoo.builder.PatternBuilder.build(PatternBuilder.java:78)
>         at org.drools.core.reteoo.builder.GroupElementBuilder$AndBuilder.build(GroupElementBuilder.java:108)
>         at org.drools.core.reteoo.builder.GroupElementBuilder.build(GroupElementBuilder.java:68)
>         at org.drools.core.reteoo.builder.ReteooRuleBuilder.addSubRule(ReteooRuleBuilder.java:161)
>         at org.drools.core.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.java:133)
>         at org.drools.core.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:106)
>         at org.drools.core.impl.KnowledgeBaseImpl.addRule(KnowledgeBaseImpl.java:1567)
>         at org.drools.core.impl.KnowledgeBaseImpl.addRule(KnowledgeBaseImpl.java:1547)
>         at org.drools.core.impl.KnowledgeBaseImpl.internalAddPackages(KnowledgeBaseImpl.java:920)
>         at org.drools.core.impl.KnowledgeBaseImpl.access$000(KnowledgeBaseImpl.java:117)
>         at org.drools.core.impl.KnowledgeBaseImpl$1.run(KnowledgeBaseImpl.java:708)
>         at org.drools.core.impl.KnowledgeBaseImpl.enqueueModification(KnowledgeBaseImpl.java:716)
>         at org.drools.core.impl.KnowledgeBaseImpl.addPackages(KnowledgeBaseImpl.java:705)
>         at org.drools.core.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:273)
>         at org.drools.impl.adapters.KnowledgeBaseAdapter.addKnowledgePackages(KnowledgeBaseAdapter.java:62)
>         at bug.demo.BugReloadableDecisionTableTest.addRuleSetToKnowledgeBase(BugReloadableDecisionTableTest.java:63)
>         at bug.demo.BugReloadableDecisionTableTest.testReuseKnowledgePackage(BugReloadableDecisionTableTest.java:53)
> {code}



--
This message was sent by Atlassian JIRA
(v6.4.11#64026)