aljoscha commented on issue #10944: [FLINK-15739] Fix TypeSerializerUpgradeTestBase on Java 12 URL: https://github.com/apache/flink/pull/10944#issuecomment-578687318 @zentol The tests do relocation because the fake a changing class. This is done by having two different classes in the code but relocating them to be one and the same class at runtime. At different points in time, though, so in the setup one class will be relocated to the target class name and in the verification step another class will be relocated to the target class name. You can see this in https://github.com/apache/flink/blob/15f175a7bcbe4cc83349fc13d022a5ef5ea0db71/flink-core/src/test/java/org/apache/flink/api/java/typeutils/runtime/PojoSerializerUpgradeTestSpecifications.java#L239 and the following verification class.
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