Matthias created FLINK-22630:
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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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