justinmclean opened a new issue, #5132:
URL: https://github.com/apache/gravitino/issues/5132
### Version
main branch
### Describe what's wrong
Try to display roles and this error occurs:
```Unable to process: Error code: 405, error message: No content to map due
to end-of-input
at [Source: (String)""; line: 1, column: 0], json string: ```
### Error message and/or stacktrace
see above
### How to reproduce
Start the playground and list role via the Java API and call the
`listUserNames` method in GravitinoClient.
### Additional context
I assume this is because no users exist? If so the API should handle this
situation.
Note that other calls to create or delete users give this error below, so
while the playground doesn't support users, that error should probably not
occur.
```You should set 'gravitino.authorization.enable' to true in the server
side `gravitino.conf` to enable the authorization of the system, otherwise
these interfaces can't work.```
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