AnonHxy opened a new pull request, #15677:
URL: https://github.com/apache/pulsar/pull/15677
### Motivation
when `messageRoutingMode` is set `CustomPartition` and `messageRouter` is
not set, the exception message is :
```
When 'messageRouter' is set, 'messageRoutingMode' should be set as
CustomPartition
```
which will confuse the users
### Modifications
Correct the exceptions message
### Verifying this change
- [x] Make sure that the change passes the CI checks.
This change added tests and can be verified as follows:
-
`org.apache.pulsar.client.impl.ProducerBuilderImplTest#testProducerBuilderImplWhenMessageRoutingIsCustomPartitionAndMessageRouterNotSet`
### Documentation
- [x] `no-need-doc`
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