AnonHxy opened a new pull request, #15327:
URL: https://github.com/apache/pulsar/pull/15327
### Motivation
* If we set `scheam` as null when using `PulsarClient` new consumer or
producer like this:
```Consumer<?> consumer = client.newConsumer(null)
.topic(topic)
.subscriptionName(subscription)
.subscribe();
```
It does not throw exceptions before consumer buid, but will throw exceptions
when `org.apache.pulsar.client.impl.ConsumerImpl#connectionOpened` invoked,
then try to reconnect later:
<img width="1772" alt="image"
src="https://user-images.githubusercontent.com/10233437/165218210-0203a233-47f8-4223-9c5f-3cde3505f786.png";>
* For detail, the code where throws exception is located at：
https://github.com/apache/pulsar/blob/74eae1a729c33c9fead9d54594bdee5fac8ab153/pulsar-client/src/main/java/org/apache/pulsar/client/impl/ConsumerImpl.java#L827
### Modifications
If `schema` is null, throw exceptions when buiding the consumer or producer
### Verifying this change
- [x] Make sure that the change passes the CI checks.
### Documentation
- [x] `no-need-doc`
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