[jira] [Created] (MINIFI-128) NPE if nifi.minifi.notifier.file.config.path wasn't configured

["Andrew Grande (JIRA)" <ji...@apache.org>]

Andrew Grande created MINIFI-128:
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             Summary: NPE if nifi.minifi.notifier.file.config.path wasn't configured
                 Key: MINIFI-128
                 URL: https://issues.apache.org/jira/browse/MINIFI-128
             Project: Apache NiFi MiNiFi
          Issue Type: Bug
         Environment: current master branch build
            Reporter: Andrew Grande
            Priority: Minor


When enabling a FileChangeNotifier, it's easy to forget uncommenting the *nifi.minifi.notifier.file.config.path* property (required). Minifi restart will throw an unfriendly error:
{noformat}
Exception in thread "main" java.lang.IllegalArgumentException: Property, nifi.minifi.notifier.file.config.path, for the path of the config file must be specified.
        at org.apache.nifi.minifi.bootstrap.configuration.notifiers.FileChangeNotifier.initialize(FileChangeNotifier.java:154)
        at org.apache.nifi.minifi.bootstrap.RunMiNiFi.initializeNotifiers(RunMiNiFi.java:1452)
        at org.apache.nifi.minifi.bootstrap.RunMiNiFi.start(RunMiNiFi.java:1116)
        at org.apache.nifi.minifi.bootstrap.RunMiNiFi.main(RunMiNiFi.java:224)
Initiating shutdown of bootstrap change notifiers...
Exception in thread "Thread-2" java.lang.NullPointerException
        at java.util.Collections$UnmodifiableCollection.<init>(Collections.java:1026)
        at java.util.Collections$UnmodifiableSet.<init>(Collections.java:1128)
        at java.util.Collections.unmodifiableSet(Collections.java:1118)
        at org.apache.nifi.minifi.bootstrap.RunMiNiFi.getChangeNotifiers(RunMiNiFi.java:1438)
        at org.apache.nifi.minifi.bootstrap.ShutdownHook.run(ShutdownHook.java:57)
{noformat}

Expected: improve the error message to be meaningful and suggest the user configure the property. No stacktrace, as we know what's going on exactly.



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