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

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.