I was clarifying what I was expecting the setup to look like wrt different
versions supported.
I agree that the granularity of the supported version doesn't need to be
lower than what is useful to us (which I think is driven by both LTS and
also by GWT releases).
On Mon, Jun 29, 2020 at 7:47 PM Colin Alworth <co...@colinalworth.com>
wrote:
> Right - the excludes via ant are certainly an option ("use ant filters"),
> my main hope is to avoid adding another stanza of xml for the emulation for
> each release. Cutting out Java7 and adding a "java 11 or higher" to lump
> all the java 9, 10, 11 tests in would at least be a net equal in XML from
> what we have today (since compiling under Java 7 isn't an option), but
> still a bit messier than I'd like - especially if we agree that "run all
> internal tests in Java11" is reasonable (plus another few build steps to
> validate the build under other versions of Java).
>
> If that isn't deemed reasonably, we'll need a Java9 check (for the new
> of() methods), Java 10 check (new optional methods, collections copyOf),
> Java 11 check (string methods) to get caught up with the JDT we're using
> today, and 12, 13, 14 are out now, with 15 soon. Again, not impossible,
> just perhaps messy - and unwinding the "java8" flag (which really seems to
> mean "newer than java7") is less fun than I'd like.
>
> --
> Colin Alworth
> co...@colinalworth.com
>
>
>
> On Mon, Jun 29, 2020, at 9:21 PM, 'Goktug Gokdogan' via GWT Contributors
> wrote:
>
> wrt running tests:
> See https://gwt-review.googlesource.com/c/gwt/+/13861 for the pattern
> used in JRE earlier; and the CI was updated to run in both 7 and 8 at the
> same time.
>
> PS: Compiler tests ("jjs.test.Java8Test") was different because we really
> needed to run the compiler tests with new syntax inside Google which didn't
> have the Java8 VM at the time. It wasn't a deal breaker to be not able run
> Java8 JRE tests at the time so they are not super sourced.
>
> I recommend the same approach.
>
>
> On Mon, Jun 29, 2020 at 6:45 PM Colin Alworth <niloc...@gmail.com> wrote:
>
> As of somewhere in the time leading up to the GWT 2.9.0 release, it is no
> longer possible to build GWT with Java7, and similarly the decision was
> made to no longer officially support running on Java7
> (jsinterop-annotations use of "TYPE_USE", newer jetty version too I
> believe).
>
> There is still some defunct wiring in the build to handle Java 7 vs Java 8
> though, mostly with regards to running tests - since we first javac our
> java classes, and then run gwtc on them, we need to make sure that the java
> version being use can correctly compile those tests.
>
> The issue https://github.com/gwtproject/gwt/issues/9683 is tracking some
> of the existing work on this: the main remaining piece is to decide how to
> handle javadoc. GWT has its own custom doclet to handle a few custom tags,
> "example", "gwt.include", and "tip". None of this compiles after Java 8,
> since Java 9 came with a new, incompatible API to build custom tags, so
> either we drop Java 8 support for building the toolkit, require _only_ Java
> 8 to build, support two parallel copies of the custom doc wiring, or drop
> the doc wiring entirely and remove these custom tags throughout the
> codebase.
>
> Since the release of GWT 2.9 and my own work on the above ticket, I've
> been picking back up some Java 9/10/11 JRE emulation work that I had
> previously paused, and I'm running into the issue described at the top - if
> you write a test that calls Map.of() and run it on Java8 as a GWTTestCase,
> you'll get a compile error.
>
> Two basic ways I can easily see to fix this: we can make two copies of
> each test, one as an empty "real" java type and one as supersource, or we
> can guard those tests behind java version args in the build glue like we
> did for Java7 vs Java8. The first option is clunky, and while I see this
> was done for `com.google.gwt.dev.jjs.test.Java8Test`, it clearly wasn't
> done for JRE emulation tests, and I assume there was a reason for that. The
> second option requires changing our CI to build+test on some new JRE...
>
> ...and given the constraints of the Java LTS system, and the java 8/9
> divide for custom doclet stuff, it seems like the clearest win is to move
> all the way to Java11, though continue to target java 8 releases, and test
> on all JREs up until current.
>
> So that's my pitch. For completeness, some other options that seem
> workable, keeping in mind that at present there are about 3 important JRE
> versions to support well: Java 8, Java 11, and the current stable release.
> * Require Java8 for javadoc, supersource tests
> * Allow any JRE 8+, use ant filters for tests for each version, maintain
> two javadoc builds
> * Allow any JRE 8+, use ant filters, only actually produce javadoc on
> java9+ builds
>
> Other technical ways to deal with this, or have a missed an easier
> solution to one of these problems?
>
>
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