[Releng] Migrate to Eclipse 2018-12

CamilleLetavernier commented 5 years ago

Currently, the project is only compatible with Eclipse 2018-09 (And probably Eclipse Photon.0)

In Eclipse 2018-12, SWT dropped the support for GTK2 on Linux. However, JavaFX only supports GTK3 in the latest versions (After Java 9 I believe).

This means that, in order to support 2018-12, we need to update to the latest Java/JavaFX version (Java 9, or, more likely, directly Java 11)

CamilleLetavernier commented 5 years ago

For now this PR has some limitations:

It is not possible to run Maven with Java 11, because javafx-swt is not available on Maven yet (So we wouldn't be able to resolve FXCanvas). The Maven build is still configured to run with Java 8
FindBugs has been disabled. It seems that it is no longer properly maintained (The latest Findbugs version on Maven is 3.0.5 and doesn't support Java 11). We'll probably need to replace it with another component
It requires Java 11 as the minimum target; it is no longer possible to run with Java 8
- 2018-12 + FX requires Java 11, but it might be possible to support multiple platforms, including older versions of Eclipse/SWT (e.g. 2018-09 + FX should work with Java 8; but for this PR forces the dependency to Java 11)

CamilleLetavernier commented 5 years ago

The migration to Java 11 and Eclipse 2019-03 is now complete

This restricts the range of dependencies that can be used:

Eclipse must be 2019-03 or newer (2018-12 might work but is untested)
Any version of GEF and Papyrus can be used (>= Photon)
E(fx)clipse 3.5.0 is required to support Java 11. It is not part of the Release Train anymore, but can be installed via https://download.eclipse.org/efxclipse/updates-released/3.5.0/site

For developers, it is also required to download the OpenJFX 11 SDK and reference it in the E(fx)clipse preferences (JavaFX > JavaFX 11+ SDK)

eclipsesource / papyrus-gefx