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From "Matthias (Jira)" <j...@apache.org>
Subject [jira] [Created] (FLINK-22630) Different com.squareup.okhttp3:okhttp dependency versions might lead to version conflicts with io.fabric8:kubernetes-server-mock
Date Tue, 11 May 2021 08:41:00 GMT
Matthias created FLINK-22630:
--------------------------------

             Summary: 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


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:okhttp}}
internally and that using a different version of {{okhttp}} explains the error.

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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