C0urante opened a new pull request #9784:
URL: https://github.com/apache/kafka/pull/9784
If a connector fails on startup, the original cause of the error gets
discarded by the framework and the only message that gets logged looks like
this:
```
[2020-12-04 16:46:30,464] ERROR [Worker clientId=connect-1,
groupId=connect-cluster] Failed to start connector 'conn-1'
(org.apache.kafka.connect.runtime.distributed.DistributedHerder)
org.apache.kafka.connect.errors.ConnectException: Failed to start connector:
conn-1
at
org.apache.kafka.connect.runtime.distributed.DistributedHerder.lambda$startConnector$5(DistributedHerder.java:1297)
at
org.apache.kafka.connect.runtime.Worker.startConnector(Worker.java:258)
at
org.apache.kafka.connect.runtime.distributed.DistributedHerder.startConnector(DistributedHerder.java:1321)
at
org.apache.kafka.connect.runtime.distributed.DistributedHerder.access$1400(DistributedHerder.java:127)
at
org.apache.kafka.connect.runtime.distributed.DistributedHerder$13.call(DistributedHerder.java:1329)
at
org.apache.kafka.connect.runtime.distributed.DistributedHerder$13.call(DistributedHerder.java:1325)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
```
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