[jboss-jira] [JBoss JIRA] (DROOLS-1158) NullpointerException when trying to reuse KnowledgePackage into a new KnowledgeBase
Juan Carlos Garcia (JIRA)
issues at jboss.org
Tue May 3 10:05:01 EDT 2016
[ https://issues.jboss.org/browse/DROOLS-1158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Juan Carlos Garcia updated DROOLS-1158:
---------------------------------------
Description:
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}
was:
Having a set of DecisionTables which KnowledgePackage are cached in our application, after we detect a change in the filesystem, rebuild the new XLS file and try to create a new KnowledgeBase with the new KnowledgePackage + the rest of the cached packages that that were not modified, it fails with a NPE internally in Drools (6.3.0 and 6.4.0)
This is not a problem in the drools version we are currently using 6.0.1.Final in production right now.
After debugging and putting a break point into the *MvelConstraint.java:619*, it shows it is trying to look for a packageName which hasn't being loaded yet in the new kbase.
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}
> 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: Mark Proctor
> Attachments: drools-reusepackage.tar
>
>
> 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}
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