[jboss-jira] [JBoss JIRA] Created: (JBRULES-1996) NPE when using directory scanner and drl is incorrect.

[Przemyslaw Rozycki (JIRA)]

NPE when using directory scanner and drl is incorrect.
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                 Key: JBRULES-1996
                 URL: https://jira.jboss.org/jira/browse/JBRULES-1996
             Project: JBoss Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-core
    Affects Versions: 4.0.7
         Environment: Sun JDK 1.5.0_11, Kubuntu Linux 8.10, x86, 32-bit
            Reporter: Przemyslaw Rozycki
            Assignee: Mark Proctor


When I use rule agent with directory scanner, and the rule that is being scanned contains a bug, then I receive a NPE instead of error message:

java.lang.NullPointerException
        at org.drools.agent.FileScanner.readPackage(FileScanner.java:102)
        at org.drools.agent.FileScanner.getChangeSet(FileScanner.java:79)
        at org.drools.agent.FileScanner.loadPackageChanges(FileScanner.java:57)
        at org.drools.agent.DirectoryScanner.loadPackageChanges(DirectoryScanner.java:43)
        at org.drools.agent.RuleAgent.checkForChanges(RuleAgent.java:330)
        at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:298)
        at org.drools.agent.RuleAgent.configure(RuleAgent.java:284)
        at org.drools.agent.RuleAgent.init(RuleAgent.java:208)
        at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:176)
        at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:164)
... (further entries of stack trace contains my application's lines)

When I looked into code I found that DirectoryScanner object, used by the agent uses FileScanner object to scan each file in a directory. And the file scanner does not have a listener set. That's why the NPE is thrown. 

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