[pulsar-functions-worker][api] returns non-descriptive Jersey error when sending invalid json

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Motivation

When sending invalid JSON to the pulsar-functions-worker API the response from the server looks like this:

{"servlet":"org.glassfish.jersey.servlet.ServletContainer-53f0d09c",
"message":"Bad Request",
"url":"/admin/v3/sinks/public/default/SinkTest",
"status":"400"}

The problem here is that there is no descriptive error message that shows the user that the sent JSON is either broken or could not be mapped correctly.

To reproduce the issue, start Pulsar in standalone mode and send an invalid sinkConfig json to the sink creation endpoint:

curl -X "POST" "http://localhost:8080/admin/v3/sinks/public/default/SinkTest" \
    -H "Accept: application/json" \
    -H 'Content-Type: multipart/form-data; charset=utf-8; boundary=__X_PAW_BOUNDARY__' \
    -F "sinkConfig={\"xyz\"};type=application/json" -vvv

Solution

The solution is to override the default ExceptionMapper from Jersey. Unfortunately,this seems to be a rather difficult problem, as we also include jersey-media-multipart and jersey-media-json-jackson: https://stackoverflow.com/a/30371823

Alternatives

No response

Anything else?

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!