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

[Przemyslaw Rozycki (JIRA)]

    [ https://jira.jboss.org/jira/browse/JBRULES-1996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12460926#action_12460926 ] 

Przemyslaw Rozycki commented on JBRULES-1996:
---------------------------------------------

To be precise, I created the patch for the revision 25870 of the 4.0.x branch.

> NPE when using directory scanner and drl is incorrect.
> ------------------------------------------------------
>
>                 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
>             Fix For: 4.0.8
>
>         Attachments: DirectoryScanner.java.2.patch, DirectoryScanner.java.patch
>
>
> 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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