Blocker Description
Classes or interfaces that implement ConnectorClientConfigOverridePolicy were recently added in Connect as plugins that can be loaded in class loading isolation.
However the interface itself was not excluded from isolation itself, which results into definition conflicts. Any interface that is considered a base Connect plugin interface needs to be excluded by isolation itself (it's considered a "system" type).
Here's the exception:
[2019-05-23 15:16:57,802] ERROR Stopping due to error (org.apache.kafka.connect.cli.ConnectDistributed:84) java.util.ServiceConfigurationError: org.apache.kafka.connect.connector.policy.ConnectorClientConfigOverridePolicy: Provider org.apache.kafka.connect.connector.policy.AllConnectorClientConfigOverridePolicy not a subtype at java.util.ServiceLoader.fail(ServiceLoader.java:239) at java.util.ServiceLoader.access$300(ServiceLoader.java:185) at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:376) at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:404) at java.util.ServiceLoader$1.next(ServiceLoader.java:480) at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.getServiceLoaderPluginDesc(DelegatingClassLoader.java:343) at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.scanPluginPath(DelegatingClassLoader.java:317) at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.scanUrlsAndAddPlugins(DelegatingClassLoader.java:244) at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.registerPlugin(DelegatingClassLoader.java:236) at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.initPluginLoader(DelegatingClassLoader.java:205) at org.apache.kafka.connect.runtime.isolation.DelegatingClassLoader.initLoaders(DelegatingClassLoader.java:182) at org.apache.kafka.connect.runtime.isolation.Plugins.<init>(Plugins.java:61) at org.apache.kafka.connect.cli.ConnectDistributed.startConnect(ConnectDistributed.java:91) at org.apache.kafka.connect.cli.ConnectDistributed.main(ConnectDistributed.java:78)
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