[J10] Prepare Java 10 Support

[cdietrich]

With the Photon Release we should be able to support java 10

• JavaVersion constant and its from and to conversions => IDEA API we use does not support J10 but i wont care at this point
• Wizard
• new Maven/Gradle Dependencies to JDT we consume needed, poblishing probably with oxygen 3a in beginning of april (https://dev.eclipse.org/mhonarc/lists/jdt-dev/msg00978.html)
• ASM (i think asm 6.0 would be sufficient)? But we should at least check if we create a range [6.0,6.2) in gradle - created (http://dev.eclipse.org/ipzilla/show_bug.cgi?id=16102) for 6.1 and possibly we need even 6.1.1 (https://bugs.eclipse.org/bugs/show_bug.cgi?id=532291) (https://dev.eclipse.org/ipzilla/show_bug.cgi?id=16105)
• new Tycho Version needed https://bugs.eclipse.org/bugs/show_bug.cgi?id=532233
• Gradle? (could be we need gradlew 4.6 and thus an new cq. i created https://dev.eclipse.org/ipzilla/show_bug.cgi?id=15868 :white_check_mark:) - wizard need to be adapted :white_check_mark:
• Maven? I assume will work ootb
• Target Platform in Wizard
• Function wise (do not explode)

[cdietrich]

we should keep https://github.com/eclipse/xtext/issues/2578 in mind while doing this

[cdietrich]

Oxygen 3a seems not to be on photon. is that correct @kthoms ?

[cdietrich]

cc @kthoms @arnedeutsch

[ArneDeutsch]

https://github.com/ArneDeutsch/xtext-eclipse/commit/2beaf8ee7c1ba0c431988d5cf7c3f1f48bc19c98 depends on https://github.com/ArneDeutsch/xtext-core/commit/ec683f723ce778c54f2574b89c563b94d0d32bfd but only the former is merged

[kthoms]

Observed a problem building Greeting DSL with Maven on Java 10: Xtend plugin fails compiling MyDslIdeSetup

Type mismatch: cannot convert from MyDslIdeModule to Module

This error disappears when the Modules are explicitly casted although this should not be necessary.

[cdietrich]

please share a link

[cdietrich]

TODO: update to TYCHO 1.2.0 release as soon as available. use stable orbit update site for asm and co as soon as available

[ArneDeutsch]

Checked this morning (23.04.2018, 7:45). No tycho 1.2.0 yet, no stable orbit update site with asm 6.1.1 yet.

[cdietrich]

yes. not even the snapshot has full java 10 capabilies. ntl we will ship with tycho 1.2.0 snapshot configured in the beta so that one they ship that it will be a drop in replacement.

this is why i left this ticket open so that we can update to 1.2.0 final once its out and forget to change the orbit site to a stable once photon M7 is out

[cdietrich]

Fixed in 2.14