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Subprocess Caching - Nullpointer Exception

BierseppBiersepp Member Posts: 14 Contributor II
Hi, 

I built a simple process with a suprocess(caching) in the beginning where simply I pull data from a database. 
When I start executing the process I get an error: Process failed with the following message: 

 Exception: java.lang.NullPointerException
  • Message: null
  • Stack trace:
  • com.rapidminer.extension.operator_toolbox.operator.utility.CachingSubprocess.hashEmbeddedProcess(CachingSubprocess.java:315)
  • com.rapidminer.extension.operator_toolbox.operator.utility.CachingSubprocess.doWork(CachingSubprocess.java:217)
  • com.rapidminer.operator.Operator.execute(Operator.java:1023)
  • com.rapidminer.operator.execution.SimpleUnitExecutor.execute(SimpleUnitExecutor.java:77)
  • com.rapidminer.operator.ExecutionUnit$2.run(ExecutionUnit.java:805)
  • com.rapidminer.operator.ExecutionUnit$2.run(ExecutionUnit.java:800)
  • java.security.AccessController.doPrivileged(Native Method)
  • com.rapidminer.operator.ExecutionUnit.execute(ExecutionUnit.java:800)
  • com.rapidminer.operator.OperatorChain.doWork(OperatorChain.java:423)
  • com.rapidminer.operator.Operator.execute(Operator.java:1023)
  • com.rapidminer.Process.executeRoot(Process.java:1464)
  • com.rapidminer.Process.lambda$executeRootInPool$5(Process.java:1443)
  • com.rapidminer.studio.concurrency.internal.AbstractConcurrencyContext$AdaptedCallable.exec(AbstractConcurrencyContext.java:362)
  • java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
  • java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
  • java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
  • java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175)
I had this a couple of times but I am slowly getting tired of this. 

Can you fix this bug in the operator toolbox extension or help if you know how I can fix this in my process or setup? 

Best Answer

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    MichaelKnopfMichaelKnopf Administrator, Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 31 RM Data Scientist
    Solution Accepted
    Hi there,
    thanks for reporting this. It is caused by embedded operators with undefined parameters that do not have a default value. Unfortunately, one cannot always tell whether a parameter has a default value or not from the UI.
    However, the bug fix is straight forward and should make it into the next extension update.
    Thanks,
    Michael
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