Execute failed: ("NullPointerException"): null ERROR for workflow writer node

[denizkonak]

Hi,

I am trying to write a captured workflow with workflow writer node, after workflow combiner node. But I get this error message. I tried the change configuration of node and tried to run again, but it doesn’t work.

How can I solve this issue?

Thanks in advance,
Deniz

[ScottF]

Hi @denizkonak and welcome back to the forum.

What error are you seeing? I think maybe you forgot to post a screenshot or log message?

[denizkonak]

Hi Scott,

I got Execute failed:(“NullPointerException”): null error. There is no more detail about this error code.

Soryy I missed to write it to body.

Thanks,
Deniz

[marc-bux]

Hi @denizkonak,

Do you find more information in the knime.log (View → Open KNIME log), possibly after increasing the verbosity of the log (File → Preferences → KNIME → Log File Log Level → set to DEBUG)?

If there is no more information to be found, can you provide a minimal example with which to reproduce the issue?

Marc

[denizkonak]

Hi,
I got a more detailed info from Knime.log.
Here it is:

java.lang.NullPointerException
at java.util.Objects.requireNonNull(Objects.java:203)
at java.util.Optional.(Optional.java:96)
at java.util.Optional.of(Optional.java:108)
at org.knime.core.node.exec.dataexchange.in.PortObjectInNodeModel.getPortObject(PortObjectInNodeModel.java:167)
at org.knime.buildworkflows.writer.WorkflowWriterNodeModel.addReferenceReaderNodes(WorkflowWriterNodeModel.java:281)
at org.knime.buildworkflows.writer.WorkflowWriterNodeModel.write(WorkflowWriterNodeModel.java:250)
at org.knime.buildworkflows.writer.WorkflowWriterNodeModel.writeToPath(WorkflowWriterNodeModel.java:199)
at org.knime.filehandling.core.node.portobject.writer.PortObjectToPathWriterNodeModel.execute(PortObjectToPathWriterNodeModel.java:99)
at org.knime.core.node.NodeModel.executeModel(NodeModel.java:576)
at org.knime.core.node.Node.invokeFullyNodeModelExecute(Node.java:1245)
at org.knime.core.node.Node.execute(Node.java:1025)
at org.knime.core.node.workflow.NativeNodeContainer.performExecuteNode(NativeNodeContainer.java:558)
at org.knime.core.node.exec.LocalNodeExecutionJob.mainExecute(LocalNodeExecutionJob.java:95)
at org.knime.core.node.workflow.NodeExecutionJob.internalRun(NodeExecutionJob.java:201)
at org.knime.core.node.workflow.NodeExecutionJob.run(NodeExecutionJob.java:117)
at org.knime.core.util.ThreadUtils$RunnableWithContextImpl.runWithContext(ThreadUtils.java:334)
at org.knime.core.util.ThreadUtils$RunnableWithContext.run(ThreadUtils.java:210)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.knime.core.util.ThreadPool$MyFuture.run(ThreadPool.java:123)
at org.knime.core.util.ThreadPool$Worker.run(ThreadPool.java:246)
Deniz