[jboss-jira] [JBoss JIRA] (DROOLS-2552) KieBase Deserialization: NullPointerException

[Florian Braun (Jira)]

    [ https://issues.jboss.org/browse/DROOLS-2552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13667482#comment-13667482 ] 

Florian Braun commented on DROOLS-2552:
---------------------------------------

Thank you. This must have changed between 6 and 7? This was our one stumbling block trying to upgrade and since maven is the canonical way to build the kiebases the lack of documentation made this hard to figure out.

Our project has been using drools since 4 and we have a lot of our own code to mark up and build kiebases and serialize them. I am trying to move the project to maven but doing so is not an easy process so in the meantime the ability to programmatically build and serialize is needed and appreciated. Thank you again.

> KieBase Deserialization: NullPointerException
> ---------------------------------------------
>
>                 Key: DROOLS-2552
>                 URL: https://issues.jboss.org/browse/DROOLS-2552
>             Project: Drools
>          Issue Type: Bug
>          Components: core engine
>    Affects Versions: 7.7.0.Final
>         Environment: Windows 7, Java 1.8, Drools 7.7.0.Final, jBPM 7.7.0.Final
>            Reporter: Florian Braun
>            Assignee: Mario Fusco
>            Priority: Critical
>
> I have run into an issue with the KieBase serialization throwing a NullPointerException when using exists and parentheses around an or when rules are in a RuleFlowGroup.
> Example rules:
> package com.sample.rules
> rule "Your First Rule"
> ruleflow-group "group1"
>     when
>         exists ( String(this == "Hello") or String(this == "World") )
>     then
>         System.out.println("Hello or World");
> end
> rule "Your Second Rule"
> ruleflow-group "group1"
>     when
>         $string: String(this == "Hello World")
>     then
>         System.out.println($string);
> end
> Having the first rule wrap the or in () will cause a deserialization NPE:
> Exception in thread "main" java.lang.NullPointerException
> 	at org.drools.core.common.BaseNode.getSinks(BaseNode.java:241)
> 	at org.drools.core.impl.KnowledgeBaseImpl.rewireNodeAfterDeserialization(KnowledgeBaseImpl.java:494)
> 	at org.drools.core.impl.KnowledgeBaseImpl.rewireNodeAfterDeserialization(KnowledgeBaseImpl.java:511)
> 	at org.drools.core.impl.KnowledgeBaseImpl.rewireNodeAfterDeserialization(KnowledgeBaseImpl.java:511)
> 	at org.drools.core.impl.KnowledgeBaseImpl.rewireNodeAfterDeserialization(KnowledgeBaseImpl.java:511)
> 	at org.drools.core.impl.KnowledgeBaseImpl.rewireReteAfterDeserialization(KnowledgeBaseImpl.java:489)
> 	at org.drools.core.impl.KnowledgeBaseImpl.readExternal(KnowledgeBaseImpl.java:483)
> ....
> Some testing shows this:
> If the first rule is on its own then this error does *not* occur.
> If the first rule does not use () the error does *not* occur. This of course means that the rule behaves differently
> If the rules are not in an rfg this error does *not* occur



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