Bob Paulin created NIFI-12913:
---------------------------------
Summary: Python venv process failure on Ubuntu does not throw
proper excepiton
Key: NIFI-12913
URL: https://issues.apache.org/jira/browse/NIFI-12913
Project: Apache NiFi
Issue Type: Bug
Environment: Ubuntu
Reporter: Bob Paulin
Staring nifi with python extensions on is throwing a NPE in the shutdown
process that swallows the root issue
Relevant stack trace:
```
Caused by: java.lang.NullPointerException: Identifier required
at java.base/java.util.Objects.requireNonNull(Objects.java:259)
at
org.apache.nifi.py4j.logging.StandardLogLevelChangeHandler.removeListener(StandardLogLevelChangeHandler.java:78)
at
org.apache.nifi.py4j.PythonProcess.killProcess(PythonProcess.java:364)
at org.apache.nifi.py4j.PythonProcess.shutdown(PythonProcess.java:360)
at
org.apache.nifi.py4j.StandardPythonBridge.shutdown(StandardPythonBridge.java:297)
at
org.apache.nifi.py4j.StandardPythonBridge.start(StandardPythonBridge.java:85)
at
org.apache.nifi.components.ClassLoaderAwarePythonBridge.start(ClassLoaderAwarePythonBridge.java:52)
at
org.apache.nifi.controller.FlowController.<init>(FlowController.java:579)
at
org.apache.nifi.controller.FlowController.createStandaloneInstance(FlowController.java:411)
at
org.apache.nifi.spring.FlowControllerFactoryBean.getObject(FlowControllerFactoryBean.java:83)
```
Suggest at a minimum we need a null check here to let the real exception
related to the venv install failure come through.
ROOT ISSUE
The venv install command fails on Ubuntu without first running an install
command on ubuntu
EX
```
apt install python3.10-venv
```
```
python3 -m venv /home/bpaulin/nifi-2.0.0-SNAPSHOT/work/python/
The virtual environment was not created successfully because ensurepip is not
available. On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command. apt install python3.10-venv You may need
to use sudo with that command. After installing the python3-venv package,
recreate your virtual environment. Failing command:
/home/bpaulin/nifi-2.0.0-SNAPSHOT/work/python/bin/python3
```
Suggest either reading this process output text as a part of the exception
handling, sending the process output to the logger for easier debugging.
The process is exited with a 1 status but the NPE at the top of the issue is
preventing it from getting logged leaving the user guessing what happened.
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