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https://issues.apache.org/jira/browse/FLINK-22630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17343284#comment-17343284
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Chesnay Schepler commented on FLINK-22630:
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Well that just sounds like an IntelliJ bug then. We can't account for cases
where the IDE decides to mush together the dependencies of different modules
during testing. Particularly so since in the IDE shading doesn't apply.
> Different com.squareup.okhttp3:okhttp dependency versions might lead to
> version conflicts with io.fabric8:kubernetes-server-mock
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: FLINK-22630
> URL: https://issues.apache.org/jira/browse/FLINK-22630
> Project: Flink
> Issue Type: Improvement
> Components: Build System
> Affects Versions: 1.14.0
> Reporter: Matthias
> Priority: Minor
>
> I ran into the following issue when executing {{Fabric8FlinkKubeClientTest}}
> in a test suite from a different flink module that has
> {{com.squareup.okhttp3:okhttp}} set as a dependency (more specifically in my
> case {{flink-runtime}}'s {{ZooKeeperStateHandleStoreTest}}) from within
> Intellij:
> {code}
> Exception in thread "MockWebServer" java.lang.NoSuchFieldError:
> H2_PRIOR_KNOWLEDGE
> at
> okhttp3.mockwebserver.MockWebServer$3.processConnection(MockWebServer.java:499)
> at okhttp3.mockwebserver.MockWebServer$3.execute(MockWebServer.java:443)
> at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {code}
> Interestingly, the test didn't fail when executing it from command line:
> {code}
> mvn -pl flink-runtime,flink-kubernetes test
> -Dtest=Fabric8FlinkKubeClientTest,ZooKeeperStateHandleStoreTest -Dfast
> {code}
> {{Fabric8FlinkKubeClientTest}} also doesn't fail if running multiple tests of
> {{flink-kubernetes}}.
> The issue is caused by the {{MockWebServer}} implementation. I found a hint
> on [StackOverflow|https://stackoverflow.com/a/64437318/11118339] indicating
> that {{io.fabric8:kubernetes-server-mock}} uses
> {{com.squareup.okhttp3:mockwebserver}} internally which leads to the version
> clash and the error shown above.
> I checked the other dependencies and realized that we use
> {{com.squareup.okhttp3:okhttp}} in multiple modules and that Intellij adds
> all of these dependencies versions to the classpath. My conclusion was that
> there might be a version conflict accessing the wrong dependency version when
> loading the dependencies for the test execution that results in the error
> shown above.
> I verified my finding by updating the version for all
> {{{{com.squareup.okhttp3:okhttp}} dependencies to {{1.12.6}} which is used in
> {{flink-kubernetes}} and reloaded the Maven dependencies within Intellij.
> This made the above mentioned test suite containing
> {{Fabric8FlinkKubeClientTest}} in a test suite from a different flink module
> that has {{com.squareup.okhttp3:okhttp}} and
> {{ZooKeeperStateHandleStoreTest}} succeed.
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