GetFTP processor throws NullPointerException randomly on 1.1.1. 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 GetFTP works fine on version 0.6.1. To replicate the flows we have copied the flow.xml.gz file from nifi 0.6.1 to 1.1.1.Our custom processors are using the API version 0.6.1 in the project. The stacktarce is given below:
2017-03-09 02:00:02,467 ERROR [Timer-Driven Process Thread-8] o.apache.nifi.processors.standard.GetFTP GetFTP[id=1485b432-05c4-463d-a5f2-6ef76840ca6b] Unable to retrieve file /FTP_SERVER/agcd/precip/data/IDCKZRDAT0_precip_total_r005_20160806_20160806.nc due to java.lang.NullPointerException: org.apache.nifi.processor.exception.FlowFileAccessException: Failed to import data from org.apache.commons.net.io.SocketInputStream@7ab15a34 for StandardFlowFileRecord[uuid=0d0f68e0-cb9f-4c77-8a9a-c0c47a0198a0,claim=,offset=0,name=3769562285059775,size=0] due to java.lang.NullPointerException
2017-03-09 02:00:02,471 ERROR [Timer-Driven Process Thread-8] o.apache.nifi.processors.standard.GetFTP
org.apache.nifi.processor.exception.FlowFileAccessException: Failed to import data from org.apache.commons.net.io.SocketInputStream@7ab15a34 for StandardFlowFileRecord[uuid=0d0f68e0-cb9f-4c77-8a9a-c0c47a0198a0,claim=,offset=0,name=3769562285059775,size=0] due to java.lang.NullPointerException
at org.apache.nifi.controller.repository.StandardProcessSession.importFrom(StandardProcessSession.java:2690) ~[na:na]
at org.apache.nifi.processors.standard.GetFileTransfer.onTrigger(GetFileTransfer.java:194) ~[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.QuartzSchedulingAgent$2.run(QuartzSchedulingAgent.java:165) [nifi-framework-core-1.1.1.jar:1.1.1]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_111]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_111]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_111]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [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
