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

[Mark Proctor (JIRA)]

     [ https://issues.jboss.org/browse/JBRULES-1996?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mark Proctor resolved JBRULES-1996.
-----------------------------------

    Resolution: Done


Not heard anything about this being broken in 5.x knowledge agent.

> NPE when using directory scanner and drl is incorrect.
> ------------------------------------------------------
>
>                 Key: JBRULES-1996
>                 URL: https://issues.jboss.org/browse/JBRULES-1996
>             Project: 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
>              Labels: agent, rule
>             Fix For: 5.2.0.M1
>
>         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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