GetFile NullPointerException on Nifi 1.1.1

[#1]

GetFile processor throws NullPointerException randomly on 1.1.1. Sometime it throws error and sometime it works. Recently we have installed the version 1.1.1. We have another server where nifi version 0.6.1 is running. According to our observation GetFile works fine on version 0.6.1. The stacktarce is given below:

2017-03-15 12:59:46,886 ERROR [Timer-Driven Process Thread-4] o.a.nifi.processors.standard.GetFile GetFile[id=015a107a-9d19-1370-9b86-0816f7e1f7f2] Failed to retrieve files due to org.apache.nifi.processor.exception.FlowFileAccessException: Failed to import data from /var/opt/wdp/nifi-1.1.1/deploy/flow.xml.gz for StandardFlowFileRecord[uuid=6c4b21f3-6105-480f-a1bb-d955a40d416b,claim=,offset=0,name=4327546774486623,size=0] due to java.lang.NullPointerException 2017-03-15 12:59:46,900 ERROR [Timer-Driven Process Thread-4] o.a.nifi.processors.standard.GetFile org.apache.nifi.processor.exception.FlowFileAccessException: Failed to import data from /var/opt/wdp/nifi-1.1.1/deploy/flow.xml.gz for StandardFlowFileRecord[uuid=6c4b21f3-6105-480f-a1bb-d955a40d416b,claim=,offset=0,name=4327546774486623,size=0] due to java.lang.NullPointerException at org.apache.nifi.controller.repository.StandardProcessSession.importFrom(StandardProcessSession.java:2649) ~[na:na] at org.apache.nifi.processors.standard.GetFile.onTrigger(GetFile.java:432) ~[nifi-standard-processors-1.1.1.jar:1.1.1] at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27) [nifi-api-1.1.1.jar:1.1.1] at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1099) [nifi-framework-core-1.1.1.jar:1.1.1] at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:136) [nifi-framework-core-1.1.1.jar:1.1.1] at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:47) [nifi-framework-core-1.1.1.jar:1.1.1] at org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:132) [nifi-framework-core-1.1.1.jar:1.1.1] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_111] at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [na:1.8.0_111] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_111] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [na:1.8.0_111] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_111] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_111] at java.lang.Thread.run(Thread.java:745) [na:1.8.0_111] Caused by: java.lang.NullPointerException: null

[#2]

Hi, Were you able to resolve this issue? I am getting a similar error in the putEmail processor when setting the property "Attach File" to "True".

Regards,

Aveek

[#3 · Accepted solution]

Hi Aveek,

I have resolved this issue. I have migrated from nifi 0.6.1 to 1.1.1 but was using the old nar packer (nifi-standard-services-api-nar) in the project's pom. That's why I was having weird issue. Moving to the version 1.1.1 of nifi-standard-services-api-nar fixed the issue. I hope it helps.

Thanks.

Mahfuz