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 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@hop.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
