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https://issues.apache.org/jira/browse/SPARK-24417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16654772#comment-16654772
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Adrian Cole commented on SPARK-24417:
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[~dongjoon] our main server is spring boot and it unofficially works with JRE
11 until 2.1 which is in milestones. By unofficially, I mean we can run it
ignoring a benign message at startup. We want JRE 11 mainly due to a google
cloud integration which uses gRPC, then netty, as prior to JRE 11 you need to
do some weird TLS config.
A lot of the work we've done has been build related actually, dodging conflicts
with things like errorprone and/or adding dependencies for things like java
annotations. For example, we don't directly use any sun classes or anything.
I'll note a few interesting PRs here. I think most things are build related as
we got rid of most of the other things when we did Java 9.
https://github.com/openzipkin/brave/pull/806 < instrumentation, so this library
is in other people's apps. Note that log4j 1.2 doesn't work with JRE 11 though
you can get around this by using log4j 2 instead
https://github.com/openzipkin/zipkin-aws/pull/110 < our aws server variant
which dies in circleci after switching until we pasted a magic "forkMode" into
the build :P you'll also notice some fairly crazy stuff for the errorprone
plugin. That's because their recommended way assumes you always knows which
exact java version is in use, which is near impossible in oss as people use
anything.
https://github.com/openzipkin/brave-karaf/pull/9/files < having to add a dep so
Nullable doesn't make the OSGi cry..
Things like this.. I was rallying for completing 100% JDK 11 (builds) today,
then hit spark which is so far the only thing can't muscle through though looks
like you've inventoried things. Note we still wouldn't change our base docker
image to JDK 11 until spring boot 2.1 is out.
hope this helps.
> Build and Run Spark on JDK9+
> ----------------------------
>
> Key: SPARK-24417
> URL: https://issues.apache.org/jira/browse/SPARK-24417
> Project: Spark
> Issue Type: New Feature
> Components: Build
> Affects Versions: 2.3.0
> Reporter: DB Tsai
> Priority: Major
>
> This is an umbrella JIRA for Apache Spark to support Java 9+
> As Java 8 is going away soon, Java 11 will be LTS and GA this Sep, and many
> companies are testing Java 9 or Java 10 to prepare for Java 11, i's best to
> start the traumatic process of supporting newer version of Java in Apache
> Spark as a background activity.
> The subtasks are what have to be done to support Java 9+.
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