Chesnay Schepler created FLINK-24634:
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Summary: Java 11 profile should target JDK 8
Key: FLINK-24634
URL: https://issues.apache.org/jira/browse/FLINK-24634
Project: Flink
Issue Type: Technical Debt
Components: Build System
Reporter: Chesnay Schepler
Assignee: Chesnay Schepler
Fix For: 1.15.0
Thee {{java11}} profile currently targets Java 11. This was useful because we
saw that doing so reveals additional issues that are not detected when building
for Java 8. The end goal was to ensure a smooth transition once we switch.
However, this has adverse effects on developer productivity.
If you happen to switch between Java versions (for example, because of separate
environments, or because certain features require Java 8), then you can easily
run into UnsupportedVersionErrors when attempting to use Java 8 with Java 11
bytecode.
IntelliJ also picks up on this and automatically sets the language level to 11,
which means that it will readily allow you to use Java 11 exclusive APIs that
will fail on CI later on.
To remedy this I propose to split the profile.
The {{java11}} profile will pretty much stay as is, except that it is targeting
java 8. The value proposition of this profile is being able to build Flink for
Java 8 with Java 11.
A new explicitly-opt-in {{java11-target}} profile then sets the target version
to Java 11, which we will use on CI. This profile will ensure that we can
readily switch to Java 11 as the target in the future.
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