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https://issues.apache.org/jira/browse/NIFI-3738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15983434#comment-15983434
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Andy LoPresto commented on NIFI-3738:
-------------------------------------
I do have a question -- are you able to capture any of the events that cause
this exception? I've been using the test harness and if I send a message that
is {{new byte[0]}} or {{"\n".getBytes()}} only, the parser correctly interprets
this as a null message well before where the error is being thrown. If I send a
message that is non-zero but just whitespace, it interprets it as an invalid
message and routes it correctly to {{REL_INVALID}} with the message intact.
> NPE in ListenSyslog processor when datagram size is zero
> --------------------------------------------------------
>
> Key: NIFI-3738
> URL: https://issues.apache.org/jira/browse/NIFI-3738
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.1.1
> Environment: java version Oracle 1.8.0_51
> linux 2.6.32-573.7.1.el6.x86_64
> Reporter: Conrad Crampton
> Assignee: Andy LoPresto
> Priority: Minor
>
> I have a 6 node cluster with an F5 load balancer in front to distribute UDP
> syslog load. It splits an incoming syslog stream and sends separate lines to
> each node in the cluster (I am checking if zero length datagrams are being
> sent from the F5 LB). However, from Bryan Bende from user mailing lists
> >>>
> Line 431 of ListenSyslog has the following code:
> if (!valid || !event.isValid())
> So to get an NPE there means event must be null, and event comes from this
> code:
> boolean valid = true;
> try {
> event = parser.parseEvent(rawSyslogEvent.getData(), sender);
> } catch (final ProcessException pe) {
> getLogger().warn("Failed to parse Syslog event; routing to invalid");
> valid = false;
> }
> The parser returns null if the bytes sent in are null or length 0.
> We should be checking if (!valid || event == null || !event.isValid())
> to avoid this case, and I think a similar situation exists in the
> ParseSyslog processor. It appears this would only happen if parsing
> messages is enabled in ListenSyslog.
> <<<<
> and log file snippet is
> 2017-04-25 17:43:07,549 ERROR [Timer-Driven Process Thread-2]
> o.a.n.processors.standard.ListenSyslog
> ListenSyslog[id=0a932c37-0158-1000-0000-0000656754bf]
> ListenSyslog[id=0a932c37-0158-1000-0000-0000656754bf] failed to process
> session due to java.lang.NullPointerException: java.lang.NullPointerException
> 2017-04-25 17:43:07,550 ERROR [Timer-Driven Process Thread-2]
> o.a.n.processors.standard.ListenSyslog
> java.lang.NullPointerException: null
> at
> org.apache.nifi.processors.standard.ListenSyslog.onTrigger(ListenSyslog.java:431)
> ~[na:na]
> at
> org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
> ~[nifi-api-1.1.2.jar:1.1.2]
> at
> org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1099)
> ~[nifi-framework-core-1.1.2.jar:1.1.2]
> at
> org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:136)
> [nifi-framework-core-1.1.2.jar:1.1.2]
> at
> org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:47)
> [nifi-framework-core-1.1.2.jar:1.1.2]
> at
> org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:132)
> [nifi-framework-core-1.1.2.jar:1.1.2]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> [na:1.8.0_51]
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
> [na:1.8.0_51]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
> [na:1.8.0_51]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
> [na:1.8.0_51]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> [na:1.8.0_51]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> [na:1.8.0_51]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_51]
> 2017-04-25 17:43:07,550 WARN [Timer-Driven Process Thread-2]
> o.a.n.processors.standard.ListenSyslog
> ListenSyslog[id=0a932c37-0158-1000-0000-0000656754bf] Processor
> Administratively Yielded for 1 sec due to processing failure
> 2017-04-25 17:43:07,550 WARN [Timer-Driven Process Thread-2]
> o.a.n.c.t.ContinuallyRunProcessorTask Administratively Yielding
> ListenSyslog[id=0a932c37-0158-1000-0000-0000656754bf] due to uncaught
> Exception: java.lang.NullPointerException
> 2017-04-25 17:43:07,551 WARN [Timer-Driven Process Thread-2]
> o.a.n.c.t.ContinuallyRunProcessorTask
> java.lang.NullPointerException: null
> at
> org.apache.nifi.processors.standard.ListenSyslog.onTrigger(ListenSyslog.java:431)
> ~[na:na]
> at
> org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
> ~[nifi-api-1.1.2.jar:1.1.2]
> at
> org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1099)
> ~[nifi-framework-core-1.1.2.jar:1.1.2]
> at
> org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:136)
> [nifi-framework-core-1.1.2.jar:1.1.2]
> at
> org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:47)
> [nifi-framework-core-1.1.2.jar:1.1.2]
> at
> org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:132)
> [nifi-framework-core-1.1.2.jar:1.1.2]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> [na:1.8.0_51]
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
> [na:1.8.0_51]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
> [na:1.8.0_51]
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
> [na:1.8.0_51]
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> [na:1.8.0_51]
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> [na:1.8.0_51]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_51]
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