GitHub user ducquoc created a discussion: JSONSchema should works with generic
(parameterized type) POJO/DTO.
#### Expected behavior
JSONSchema should works with generic (parameterized type) POJO/DTO. No
exception at runtime, or at least update documentation/errorMessage how to
work-around/bypass the issue.
#### Actual behavior
Exception when running producer/consumer with `JSONSchema.of(clazz)` (or
`Schema.JSON(clazz)` ) wiith generic/parameterized class:
```
Exception in thread "main" java.lang.NoSuchFieldError: KEY_VALUE
at
org.apache.pulsar.client.impl.schema.KeyValueSchema.<init>(KeyValueSchema.java:50)
at org.apache.pulsar.client.api.Schema.<clinit>(Schema.java:128)
```
#### Steps to reproduce
Create Producer or Consumer with client API, using `JSONSchema.of(clazz)` (or
`Schema.JSON(clazz)` ) wiith generic/parameterized class.
Compiled OK, but when running the client producer/consumer it throws exception.
Example (https://github.com/ducquoc/pulsar/commit/a0649dc8):
https://github.com/ducquoc/pulsar/blob/fix-client-schema_json-schema-generic-parameterized-type/pulsar-functions/java-examples/src/main/java/org/apache/pulsar/functions/api/examples/pojo/BrokerMessage.java
** Work-around: use
```
private Object payload;
```
and respective getter/setter instead of
```
private T payload;
```
#### System configuration
**Pulsar version**: 2.2.0 (but seems to be also affected on latest master
branch)
GitHub link: https://github.com/apache/pulsar/discussions/18849
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