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

[Michael Schnitzler (JIRA)]

Michael Schnitzler created JBRULES-3347:
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             Summary: 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


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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