candlerb opened a new issue #5533: Missing CLI error handling in pulsar-admin
URL: https://github.com/apache/pulsar/issues/5533
 
 
   **Describe the bug**
   pulsar-admin can raise Java exceptions in certain conditions
   
   **To Reproduce**
   
   (1) Giving an invalid command - e.g. "functions getstate" (should be 
"functions querystate"), with or without `--help` added
   
   ```
   $ apache-pulsar-2.4.1/bin/pulsar-admin functions getstate
   Expected a command, got getstate
   
   Exception in thread "main" com.beust.jcommander.ParameterException: Asking 
description for unknown command: null
        at 
com.beust.jcommander.JCommander.getCommandDescription(JCommander.java:1003)
        at com.beust.jcommander.JCommander.usage(JCommander.java:988)
        at com.beust.jcommander.JCommander.usage(JCommander.java:980)
        at com.beust.jcommander.JCommander.usage(JCommander.java:972)
        at org.apache.pulsar.admin.cli.CmdBase.run(CmdBase.java:49)
        at 
org.apache.pulsar.admin.cli.PulsarAdminTool.run(PulsarAdminTool.java:218)
        at 
org.apache.pulsar.admin.cli.PulsarAdminTool.main(PulsarAdminTool.java:260)
   ```
   (Hangs here, have to press `^C`)
   
   (2) Giving a querystate command without the "--key" option
   
   ```
   $ apache-pulsar-2.4.1/bin/pulsar-admin functions querystate --name womble
   null
   
   Reason: java.lang.NullPointerException: path is 'null'.
   ```
   
   tcpdump shows no traffic on port 8080, so this appears to be a local CLI 
issue.
   
   **Expected behavior**
   Error message to be reported
   

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