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https://issues.apache.org/jira/browse/FLINK-15739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17023040#comment-17023040
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Aljoscha Krettek commented on FLINK-15739:
------------------------------------------
Yes, this does originate from the {{ClassRelocator}}, it happens when there is
an enum in a class that should be relocated. For example in
{{ModifiedPojoSchemaVerifier}}. Printing the list of classes to be remapped in
{{ClassRelocator.remap()}} yields this:
Java 1.8:
{code}
org.apache.flink.api.java.typeutils.runtime.PojoSerializerUpgradeTestSpecifications$ModifiedPojoSchemaVerifier$PojoAfterSchemaUpgrade
org.apache.flink.api.java.typeutils.runtime.PojoSerializerUpgradeTestSpecifications$ModifiedPojoSchemaVerifier$PojoAfterSchemaUpgrade$Color
org.apache.flink.api.java.typeutils.runtime.PojoSerializerUpgradeTestSpecifications$ModifiedPojoSchemaVerifier
{code}
Java 12:
{code}
java.lang.Enum$EnumDesc
org.apache.flink.api.java.typeutils.runtime.PojoSerializerUpgradeTestSpecifications$ModifiedPojoSchemaVerifier$PojoAfterSchemaUpgrade
org.apache.flink.api.java.typeutils.runtime.PojoSerializerUpgradeTestSpecifications$ModifiedPojoSchemaVerifier$PojoAfterSchemaUpgrade$Color
org.apache.flink.api.java.typeutils.runtime.PojoSerializerUpgradeTestSpecifications$ModifiedPojoSchemaVerifier
{code}
The NPE is thrown because the class {{java.lang.Enum$EnumDesc}} does not have a
{{ClassLoader}}. This is a new class in Java 12:
https://docs.oracle.com/en/java/javase/12/docs/api/java.base/java/lang/Enum.EnumDesc.html.
> PojoSerializerUpgradeTest.testSpecifications fails with NPE on Java 12
> ----------------------------------------------------------------------
>
> Key: FLINK-15739
> URL: https://issues.apache.org/jira/browse/FLINK-15739
> Project: Flink
> Issue Type: Bug
> Components: Tests
> Affects Versions: 1.11.0
> Reporter: Chesnay Schepler
> Priority: Major
>
> Possibly related to the {{ClassRelocator}} annotation.
> https://travis-ci.org/zentol/flink/jobs/640477280
> {code}
> 11:37:47.019 [ERROR]
> initializationError(org.apache.flink.api.java.typeutils.runtime.PojoSerializerUpgradeTest)
> Time elapsed: 0.032 s <<< ERROR!
> java.lang.NullPointerException
> at
> org.apache.flink.api.java.typeutils.runtime.PojoSerializerUpgradeTest.testSpecifications(PojoSerializerUpgradeTest.java:50)
> {code}
> /cc [~aljoscha] [~tzulitai]
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