Handle top-level collections without entity lookup in MappingRedisConverter #2168

[Leehyoungwoo]

Fix. #2168

Summary

This issue arises in MappingRedisConverter.write(…), which by default treats all inputs—including JDK internal types like Arrays.asList(...)—as domain entities. It looks up a PersistentEntity for every input and then retrieves metadata (keyspace, identifier, TTL). On Java 9+ this leads to an InaccessibleObjectException when reflection tries to access the non-exported constructor of Arrays$ArrayList.

To address this, I added an early check in write(...):

if (source instanceof Collection) {
    writeCollection(
        sink.getKeyspace(),
        "",
        (List<?>) source,
        TypeInformation.of(Object.class),
        sink
    );
    return;
}

This skips all metadata lookups for top-level collections by directly invoking writeCollection(...).

I removed the @EnabledOnJre(JRE.JAVA_8) restriction on the writePlainList() test (now annotated // GH-2168) and verified that it passes on non–Java 8 environments.

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