[Issue-11270] Change ContextClassLoader to NarClassLoader in ProtocolHandler

[Jason918]

Fixes #11270

Motivation

See #11270

Modifications

Change context class loader through Thread.currentThread().setContextClassLoader(classLoader) before every protocol handler callback, and change it back to original class loader afterwards.

Verifying this change

• Make sure that the change passes the CI checks.

This change added tests and can be verified as follows:

see new test case in org.apache.pulsar.broker.protocol.ProtocolHandlerWithClassLoaderTest#testClassLoaderSwitcher.

Does this pull request potentially affect one of the following parts:

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): (no)
• The public API: (no)
• The schema: (no)
• The default values of configurations: (no)
• The wire protocol: (no)
• The rest endpoints: (no)
• The admin cli options: (no)
• Anything that affects deployment: (no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[Anonymitaet]

@Jason918
thanks for your contribution. For this PR, do we need to update docs?

[Jason918]

/pulsarbot run-failure-checks

[Jason918]

thanks for your contribution. For this PR, do we need to update docs?

@Anonymitaet Nop, I think it's transparent to the user and developer. Just fixing some conner issue.

[eolivelli]

LGTM

tagging @merlimat @jerrypeng as we are working on the "classpath" problem for Pulsar IO