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From Stefan Bodewig <bode...@apache.org>
Subject Re: ant git commit: Generate manifest files and add automatic module names for JPMS
Date Wed, 07 Feb 2018 10:44:28 GMT
On 2018-02-06, Gintautas Grigelionis wrote:

> 2018-02-06 11:05 GMT+01:00 Stefan Bodewig <bodewig@apache.org>:

>> If the taskdef/typedef implementation classes are loaded via a module
>> path and a custom task lives on the CLASSPATH will taskdef be able to
>> load it at all?

> Anything on the CLASSPATH is in the unnamed module.

I know. :-)

> The worst that can happen is the situation where a package split between
> module path and classpath.
> That's what --patch-module is for.

Or where a custom task lives inside of a module itself and you need to
add an import to that module to Ant. How do you enforce that from inside
the build file where the taskdef is written? Do you tell users of your
task to always start with ANT_OPTS=... or provide a wrapper script?

All I'm saying is that we need to try out a bunch of use cases to see
what works and what doesn't. What users could expect of a modularized
version of Ant and what exactly the benefit for users is going to be.

Personally I don't expect the "good old classpath world" to disappear
any time soon, but I've been wrong so many times ...

> Modules is the way to take back control.

Of the JDK. I really don't believe it helps writers of build tools in
any way :-)

> There are switches in Java 9 to enable access.  We should rather be
> doing now when JRE is still lenient. Who knows what to expect from
> Java 11 LTS (6 months from now)?

My fear is that if the classpath world stops working then a completely
different version of Ant will be required. A version that has to break
backwards compatibility in many ways. I'd appreciate anybody trying to
assess what would need to change in a pure module world, I know I cannot
be the one.

Ant plays well with the modularized JDK, we verified that in late 2016
before the rules were relaxed in Java9. Turning Ant into a "modular"
application in the sense of Java9 modules is a completely different can
of worms.

Stefan

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