snuyanzin commented on code in PR #19780:
URL: https://github.com/apache/flink/pull/19780#discussion_r988900830


##########
flink-streaming-java/src/test/java/org/apache/flink/streaming/api/functions/sink/TwoPhaseCommitSinkStateSerializerUpgradeTest.java:
##########
@@ -39,22 +37,12 @@
 /**
  * A {@link TypeSerializerUpgradeTestBase} for {@link 
TwoPhaseCommitSinkFunction.StateSerializer}.
  */
-@RunWith(Parameterized.class)
 public class TwoPhaseCommitSinkStateSerializerUpgradeTest

Review Comment:
   junit5 has issues if it is not public
   ```
   java.lang.IllegalAccessError: tried to access class 
org.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkStateSerializerUpgradeTest
 from class 
org.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkStateSerializerUpgradeTest$TwoPhaseCommitSinkStateSerializerVerifier$generated2$
   
        at 
org.apache.flink.streaming.api.functions.sink.TwoPhaseCommitSinkStateSerializerUpgradeTest$TwoPhaseCommitSinkStateSerializerVerifier$generated2$.createUpgradedSerializer(TwoPhaseCommitSinkStateSerializerUpgradeTest.java:103)
        at 
org.apache.flink.api.common.typeutils.TypeSerializerUpgradeTestBase$ClassLoaderSafeUpgradeVerifier.createUpgradedSerializer(TypeSerializerUpgradeTestBase.java:171)
        at 
org.apache.flink.api.common.typeutils.TypeSerializerUpgradeTestBase.upgradedSerializerIsValidAfterMigration(TypeSerializerUpgradeTestBase.java:342)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:725)
        at 
org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
        at 
org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
        at 
org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
        at 
org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)
   ...
   ```



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