[jboss-jira] [JBoss JIRA] (JBRULES-3347) ResourceChangeScanner trying to scan rule file when instead the change set contains a package only

[Michael Schnitzler (JIRA)]

    [ https://issues.jboss.org/browse/JBRULES-3347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12659655#comment-12659655 ] 

Michael Schnitzler commented on JBRULES-3347:
---------------------------------------------

Executing the JUnit test will generate this output:

created knowledge package
(null: 3, 175): cvc-elt.1: Cannot find the declaration of element 'change-set'.
Exception in thread "Thread-1" java.lang.NullPointerException
	at org.drools.io.impl.ClassPathResource.getURL(ClassPathResource.java:124)
	at org.drools.io.impl.ClassPathResource.getLastModified(ClassPathResource.java:139)
	at org.drools.io.impl.ResourceChangeScannerImpl.scan(ResourceChangeScannerImpl.java:166)
	at org.drools.io.impl.ResourceChangeScannerImpl$ProcessChangeSet.run(ResourceChangeScannerImpl.java:311)
	at java.lang.Thread.run(Unknown Source)
rule 0 fired
rule 0 fired
DONE

Removing the function from DRL file will generate the same output - except for the Exception.
Also, the resource scanner seems to be stopped after the exception has been thrown.
                
> ResourceChangeScanner trying to scan rule file when instead the change set contains a package only
> --------------------------------------------------------------------------------------------------
>
>                 Key: JBRULES-3347
>                 URL: https://issues.jboss.org/browse/JBRULES-3347
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-core
>    Affects Versions: 5.3.0.Final
>            Reporter: Michael Schnitzler
>            Assignee: Mark Proctor
>         Attachments: drools-test.zip
>
>
> 1.) Create a KnowledgeBase using a rule file (DRL) on the classpath. The rule file has to contain a Drools function.
> 2.) Serialize the the KnowledgeBase to the file system.
> 3.) Create a changeset definition that adds the serialized package only.
> 4.) Create a client that creates a KnowledgeAgent and apply the changeset. The class path should not contain the original rule files.
> 5.) Start the ResourceChangeScanner
> This will lead to a NPE in the ResourceChangeScannerImpl:
> Exception in thread "Thread-0" java.lang.NullPointerException
> 	at org.drools.io.impl.ClassPathResource.getURL(ClassPathResource.java:124)
> 	at org.drools.io.impl.ClassPathResource.getLastModified(ClassPathResource.java:139)
> 	at org.drools.io.impl.ResourceChangeScannerImpl.scan(ResourceChangeScannerImpl.java:166)
> 	at org.drools.io.impl.ResourceChangeScannerImpl$ProcessChangeSet.run(ResourceChangeScannerImpl.java:311)
> 	at java.lang.Thread.run(Unknown Source)
> The reason for this  seems to be:
> In private method KnowledgeAgentImpl.buildResourceMapping the function's resource (the DRL file) is retrieved and added to the registered resources . But the client is not distributed with the rule file on its classpath. 

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