[GitHub] [hop] liosc opened a new issue, #2840: [Bug]: NullPointerException in workflow executor

["liosc (via GitHub)" <gi...@apache.org>]

liosc opened a new issue, #2840:
URL: https://github.com/apache/hop/issues/2840

   ### Apache Hop version?
   
   2.5.0-SNAPSHOT (2023-04-13 07.35.03)
   
   ### Java version?
   
   11.0.15
   
   ### Operating system
   
   Windows
   
   ### What happened?
   
   When a pipeline called by the Workflow executor does not give back any rows, a NullPointerException exception occurs. This happens when in the Workflow executor there is at least one field in the result rows tab.
   Here attached an example with:
   1. the pipeline using a Workflow executor
   2. the workflow called by the pipeline
   3. the pipeline called by the workflow
   In the Workflow executor there is a parameter that you can set to have three different scenarios. Here the parameter values and what happens:
   -> 0. The called pipeline gives back a row with the right stream metadata. No errors occur.
   -> 1. The called pipeline gives back no rows. NullPointerException error occurs. In this case the transform should not raise any error
   -> 2. The called pipeline gives back a row but with wrong stream metadata (in this example a missing field). Same NullPointerException error occurs. In this case could be OK to raise an error but it should be handled to have a meaningful message, possibly specifying where the metadata are incongruent (similar to what the GUI highlights when you create a second hop in input to the same transform using different streams).
   [wf_executor_nullpointer.zip](https://github.com/apache/hop/files/11299526/wf_executor_nullpointer.zip)
   
   
   ### Issue Priority
   
   Priority: 1
   
   ### Issue Component
   
   Component: Transforms


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[GitHub] [hop] hansva closed issue #2840: [Bug]: NullPointerException in workflow executor

["hansva (via GitHub)" <gi...@apache.org>]

hansva closed issue #2840: [Bug]: NullPointerException in workflow executor
URL: https://github.com/apache/hop/issues/2840


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