JDK9 and Gradle modular quickstart
Malachi de Ælfweald
malachid at gmail.com
Thu Aug 25 15:00:44 UTC 2016
Hi David,
Thank you for sharing this.
A couple thoughts -
- you might consider posting it in a repo as opposed to a zip so we can
follow changes (bitbucket, kenai, whatever)
- adding an .hgignore
- reading the note at the top of your build.gradle, this comment caught
my attention "*Note that the test packages cannot overlap with your
module packages.*" I think that one is really important as it would
indicate that there might be difficulties doing Android Flavors moving
forward.
- on your build.gradle, you have '4.+' - it is no longer recommended to
use the + and the IDEs will throw warnings about it (also JUnit 5 is
available)
- instead of having a single build.gradle with 3 different compile
tasks; why did you not make it 3 separate modules (each with their own
compile task)?
When I ran `./gradlew build` it failed because it could not find
org.dave.Person:
test.org.dave.PersonTest > canConstructAPersonWithAName FAILED
java.lang.NoClassDefFoundError at PersonTest.java:11
Caused by: java.lang.ClassNotFoundException at PersonTest.java:11
Per your README, I tried setting export _JAVA_OPTIONS="--add-exports
dave/org.dave.internal=ALL-UNNAMED"
and re-running the build; which resulted in:
Unrecognized option: --add-exports
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
Looking at my previous _JAVA_OPTIONS, I tried export
_JAVA_OPTIONS="--add-exports=dave/org.dave.internal=ALL-UNNAMED"
and re-running the build; which resulted in:
Error occurred during initialization of VM
java.lang.RuntimeException: Unknown module: dave
at jdk.internal.module.ModuleBootstrap.fail(java.base at 9-ea
/ModuleBootstrap.java:543)
at jdk.internal.module.ModuleBootstrap.addExtraExports(java.base at 9-ea
/ModuleBootstrap.java:457)
at jdk.internal.module.ModuleBootstrap.boot(java.base at 9-ea
/ModuleBootstrap.java:322)
at java.lang.System.initPhase2(java.base at 9-ea/System.java:1925)
Any thoughts?
Malachi de Ælfweald
http://www.google.com/profiles/malachid
On Thu, Aug 25, 2016 at 6:19 AM, David Hill <David.Hill at oracle.com> wrote:
>
> Hi,
> I mentioned I was working on a modular compilation with Gradle 3 and
> JDK9. I have something to share now :-)
>
> This adapted quickstart comprises a "module" of two classes, a test class,
> and a "shim" test class. (The shim is an adapter used for 'white box' style
> tests).
>
> http://cr.openjdk.java.net/~ddhill/module-quickstart.zip
>
> The first half of the build.gradle is a README that explains a lot of my
> design constraints, and choices.
>
> Gradle is really good at making the simple cases ... simple. Clearly they
> have a bit more to go to handle modules natively, but as my quickstart
> shows, it can be done now without too much extra effort.
>
> I would be interested in any comments or suggestions on how I have solved
> this task. I plan on folding what I have found into the OpenJFX build.
>
> Dave
>
>
> --
> David Hill<David.Hill at Oracle.com>
> Java Embedded Development
>
> "A man's feet should be planted in his country, but his eyes should survey
> the world."
> -- George Santayana (1863 - 1952)
>
>
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