Chesnay Schepler created FLINK-14905:
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Summary: Unify packaging process
Key: FLINK-14905
URL: https://issues.apache.org/jira/browse/FLINK-14905
Project: Flink
Issue Type: Sub-task
Components: Build System
Reporter: Chesnay Schepler
Assignee: Chesnay Schepler
Fix For: 1.10.0
Right now we have a Java 11 profile for customizing the build in various ways,
from bumping plugins, setting compiler flags, disabling tests and even some
dependencies.
The dependencies bit a problematic since it implies that not all jars created
by the Java 8 build process can actually run on Java 11.
This creates an unnecessary burden for users who want to use Java 11 (reminder:
the only supported LTS version) as they'd have to compile Flink themselves for
Java 11.
Releasing a second set of jars/binaries is out of the question due to the
confusion and overhead this would cause, so instead we should ensure that the
Java 8 jars are usable on Java 11.
My proposal is to use a multi-release jar to package additional dependencies
that are only loaded on Java 11.
I have verified that this approach works conceptually, whether it works with
the dependency we have to deal with (jaxb-api) remains to be seen.
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