Jason918 opened a new issue #11270:
URL: https://github.com/apache/pulsar/issues/11270
**Is your enhancement request related to a problem? Please describe.**
I am working on a new protocol handler for an existing mq implementation.
ClassNotFoundException occurs when I am calling methods like
`com.fastjson.JSON.parseObject("some json str", MyConfig.class)`. This happens
because the MyConfig.class is dynamically loaded by a NarClassLoader in
protocol hander mechanism, but current thread calling
`ProtocolHandler::initialize` uses the default class load in pulsar.
**Describe the solution you'd like**
IMHO, Maybe it's not very elegant for protocol handler to handle class
loader issue in its own project?
As there is an ProtocolHandlerWithClassLoader object in each protocol
handlers, I am suggesting change the thread default class loader to the
NarClassLoader before we call interfaces in ProtocolHandler.
**Describe alternatives you've considered**
Currently, I am getting the NarClassLoader through
`MyProtocolHandler.class.getClassLoader()`.
I think it's a bit of tricky.
**Additional context**
Add any other context or screenshots about the feature request here.
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