Splunk throwing HTTP 401 not authorized error when called from Java SDK

[raghav130593]

I have multiple GetSplunk processors running using a Cron driven scheduling strategy. The Cron expression looks like '0 30 13 * * ?'. They all successfully execute the query the first time it's run. But, the next day it errors out with a 401 error from Splunk. The error from nifi-app.log is as below. The Cron scheduler in NiFi is a QuartzScheduler.
WARN [Timer-Driven Process Thread-7] o.a.n.c.t.ContinuallyRunProcessorTask Administratively Yielding GetSplunk[id=01581009-026c-114b-5e2e-401ebea6427d] due to uncaught Exception: com.splunk.HttpException: HTTP 401 -- call not properly authenticated
2016-12-21 13:30:00,300 WARN [Timer-Driven Process Thread-2] o.a.n.c.t.ContinuallyRunProcessorTask
com.splunk.HttpException: HTTP 401 -- call not properly authenticated
at com.splunk.HttpException.create(HttpException.java:84) ~[na:na]
at com.splunk.HttpService.send(HttpService.java:452) ~[na:na]
at com.splunk.Service.send(Service.java:1293) ~[na:na]
at com.splunk.HttpService.get(HttpService.java:165) ~[na:na]
at com.splunk.Service.export(Service.java:222) ~[na:na]
at com.splunk.Service.export(Service.java:237) ~[na:na]
at org.apache.nifi.processors.splunk.GetSplunk.onTrigger(GetSplunk.java:461) ~[na:na]
at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27) ~[nifi-api-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1064) ~[nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:136) [nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:47) [nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
at org.apache.nifi.controller.scheduling.QuartzSchedulingAgent$2.run(QuartzSchedulingAgent.java:165) [nifi-framework-core-1.1.0-SNAPSHOT.jar:1.1.0-SNAPSHOT]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_101]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_101]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_101]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_101]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_101]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_101]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_101]

The GetSplunk processor makes use of Java SDK for Splunk. My earliest time is '-24h' and latest time is 'now'. I am hitting splunkd with port 8089.
Help appreciated.

[raghav130593 · Accepted solution]

I found the issue. It was a lazy authorization issue within Apache Nifi's GetSplunk processor and not really Splunk's issue. The session that getting created used to expire and a new session wasn't getting created consecutive times within the cron scheduler.

[jantreassian]

@raghav130593, which version of the Splunk SDK are you using?
I'm having this issue as well with version 1.3.2.