One of the failing tier1 tests in OpenJDK 8u is:
It fails with:
java.lang.AssertionError: expected [Reiva] but found [\u0420\u0435\u0438\u0432\u0430]
test JapanEraNameCompatTest.testChronoJapanEraDisplayName(no, "Reiwa", "R"): failure
java.lang.AssertionError: expected [R] but found [Reiwa]
This issue got introduced with the backport of JDK-8218781. Locale data isn't up-to-date enough. Hence the test fails. The proposal is to include parts of JDK-8008577 and JDK-8145136 which is how this is being fixed in later JDKs.
More information here: