Java 9 support and readiness

[gorkem]

See also : https://wiki.eclipse.org/Java_9_Readiness

Known issues:

• Hover on module doesn't return the module javadoc Hover on module doesn't return the module javadoc #294
• AssertionFailedException when autocompleting a module-info.java AssertionFailedException when autocompleting a module in module-info.java #295
• Type autocompletion fails in module-info.java Type autocompletion fails in module-info.java #296

[fbricon]

So m2e now seems to behave properly, at least for simple projects (we still need to consume the latest m2e bits). The main issue now is figuring out how to make our build use the jdt-java9 patches. The http://download.eclipse.org/eclipse/updates/4.7-P-builds update site exposes the feature patch, but I can't get the target platform to actually reference the patched plugins. It seems tycho doesn't see the plugins either. @mickaelistria any idea?

[mickaelistria]

Did you try to put a specific version requirement to enforce usage of the patched plugin?

[fbricon]

Found the actual plugins in http://download.eclipse.org/eclipse/updates/4.7-Y-builds/.

I pushed #293, if anyone wants to play with it.

Default Java 9 config seems to work, tested for Maven projects. But at this point, the lack of automodule support is a non-starter though.

[fbricon]

Guess we can close this one. New problems will be reported in other tickets.