OAuth2 authentication init fails with ClassCastException #500
Description
I am using Spring Pulsar with Spring Boot 3.2.0-M3 with the Pulsar Client 3.1.0.
I am configuring the OAuth2 (with JWT) like this (as the docs says here):
spring:
pulsar:
client:
authentication:
plugin-class-name: org.apache.pulsar.client.impl.auth.oauth2.AuthenticationFactoryOAuth2
param:
issuerUrl: https://idp.mycompany.com
privateKey: ...
I get the following error at application startup:
Caused by: java.lang.IllegalStateException: Unable to configure Pulsar authentication
...
Caused by: org.apache.pulsar.client.api.PulsarClientException$UnsupportedAuthenticationException: java.lang.ClassCastException: class org.apache.pulsar.client.impl.auth.oauth2.AuthenticationFactoryOAuth2 cannot be cast to class org.apache.pulsar.client.api.Authentication (org.apache.pulsar.client.impl.auth.oauth2.AuthenticationFactoryOAuth2 and org.apache.pulsar.client.api.Authentication are in unnamed module of loader org.springframework.boot.loader.LaunchedURLClassLoader @2b71fc7e)
at org.apache.pulsar.client.impl.AuthenticationUtil.create(AuthenticationUtil.java:118) ~[pulsar-client-3.1.0.jar!/:3.1.0]
at org.apache.pulsar.client.impl.PulsarClientImplementationBindingImpl.createAuthentication(PulsarClientImplementationBindingImpl.java:133) ~[pulsar-client-3.1.0.jar!/:3.1.0]
at org.apache.pulsar.client.api.AuthenticationFactory.create(AuthenticationFactory.java:108) ~[pulsar-client-api-3.1.0.jar!/:3.1.0]
... 85 common frames omitted
Caused by: java.lang.ClassCastException: class org.apache.pulsar.client.impl.auth.oauth2.AuthenticationFactoryOAuth2 cannot be cast to class org.apache.pulsar.client.api.Authentication (org.apache.pulsar.client.impl.auth.oauth2.AuthenticationFactoryOAuth2 and org.apache.pulsar.client.api.Authentication are in unnamed module of loader org.springframework.boot.loader.LaunchedURLClassLoader @2b71fc7e)
at org.apache.pulsar.client.impl.AuthenticationUtil.create(AuthenticationUtil.java:111) ~[pulsar-client-3.1.0.jar!/:3.1.0]
... 87 common frames omitted
Looks like the code assumes that the factory can be cast to the Authentication class which doesn't look like the class design at all.