[wildfly-dev] Multi-release module JARs

[Brian Stansberry]

Thanks for this thread, Paul.

On Wed, Jun 10, 2020 at 3:31 PM Paul Ferraro <paul.ferraro at redhat.com>
wrote:

> In version 30 of jboss-parent-pom, David Lloyd added the ability to
> easily produce multi-release jars [1].  While several components
> consumed by WildFly currently produce multi-release jars (e.g.
> wildfly-common, Undertow, Infinispan, etc.), as far as I am aware,
> none of the modules in WildFly (or wf-core) do this.
>
> I recently created a pull request to WildFly [2] that ports a
> collection class from Undertow [3], which, when built using Java 9+,
> results in faster expiration scheduling for persistent HttpSessions
> and local @Stateful EJBs.  While the changes introduced in this PR are
> still compatible with JDK 8 [4], this optimization will not be
> available to users unless they build wildfly using JDK 9+ in order to
> produce the requisite multi-release jar for the
> wildfly-clustering-ee-cache module.
>
> What do people think about this?
>
> Is there any reason why we should *not* compile using JDK 11 when
> building releases (while still maintaining Java 8 source
> compatibility, of course)?
>

One issue I can think of is CI. We'd probably need to alter jobs to build
with JDK 11 and then test with JDK 8. I think our integration testsuite
runs for JDK 8 should be running a server built the way a released server
is built.

The tests in the subsystems wouldn't run with JDK 8 unless we had separate
jobs just for that purpose (which is no big deal.)

To be fair, our JDK 11 CI jobs are building with JDK 11 and then testing
that, and our releases are built with JDK 8. So the existence of a mismatch
is not new. My impression though is JDK 8 remains dominant, so shifting the
mismatch to the JDK 8 side is a concern.

This isn't a showstopper kind of thing for me, it's just something to think
about and make a conscious plan.


> Even if we continue to create releases using JDK 8 builds, does anyone
> object to giving users the  option to build WildFly with multi-release
> module jars when compiling with a more recent JDK version?
>

I don't.

>
> [1] https://issues.redhat.com/browse/WFLY-10178
> [2] https://github.com/wildfly/wildfly/pull/13334
> [3]
> https://github.com/undertow-io/undertow/blob/master/core/src/main/java9/io/undertow/util/FastConcurrentDirectDeque.java
> [4] https://ci.wildfly.org/buildConfiguration/WFPR/207451
>
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>

-- 
Brian Stansberry
Manager, Senior Principal Software Engineer
Red Hat
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