igalshilman commented on issue #10944: [FLINK-15739] Fix TypeSerializerUpgradeTestBase on Java 12 URL: https://github.com/apache/flink/pull/10944#issuecomment-579164401 @zentol The main problem that this approach solves is: we need two different definitions of the same class (same fully qualified class name, but different fields) to be present at runtime. Having the classes in different modules, means that these modules can not be in the class path simultaneously. (how would the pom.xml would look like with these constrains?) So the relocating approach allows these two classes co-existing with different compile time names, but they are loaded into separate classloaders with the same (fully qualified name).
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