Tycho: requires 'osgi.ee; (&(osgi.ee=JavaSE)(version=11))' but it could not be found

[dwagelaar]

In order to build ATL against the latest Eclipse release plug-ins, I've started the effort to port it to JavaSE-11 (https://bugs.eclipse.org/bugs/show_bug.cgi?id=576366). Only a few changes were required in the source code, and I got ATL to build fairly quickly within the Eclipse IDE.

The tycho build is another matter, however. When updating to the latest tycho release (required for JavaSE-11), it spits out the following error:

[INFO] Computing target platform for MavenProject: org.eclipse.m2m.atl:org.eclipse.m2m.atl.emftvm:4.6.0-SNAPSHOT @ /home/dennis/Documents/Werk/Projects/org.eclipse.atl/plugins/org.eclipse.m2m.atl.emftvm/pom.xml
[ERROR] Cannot resolve target definition:
[ERROR]   Software being installed: org.eclipse.emf.sdk.feature.group 2.28.0.v20211110-0654
[ERROR]   Missing requirement: org.eclipse.core.jobs 3.12.0.v20210723-1034 requires 'osgi.ee; (&(osgi.ee=JavaSE)(version=11))' but it could not be found
[ERROR]   Cannot satisfy dependency: org.eclipse.core.runtime 3.24.0.v20210910-0750 depends on: osgi.bundle; org.eclipse.core.jobs [3.12.0,4.0.0)
[ERROR]   Cannot satisfy dependency: org.eclipse.emf.common.feature.group 2.24.0.v20210924-1718 depends on: org.eclipse.equinox.p2.iu; org.eclipse.core.runtime 0.0.0
[ERROR]   Cannot satisfy dependency: org.eclipse.emf.feature.group 2.28.0.v20211110-0654 depends on: org.eclipse.equinox.p2.iu; org.eclipse.emf.common.feature.group [2.24.0.v20210924-1718,2.24.0.v20210924-1718]
[ERROR]   Cannot satisfy dependency: org.eclipse.emf.sdk.feature.group 2.28.0.v20211110-0654 depends on: org.eclipse.equinox.p2.iu; org.eclipse.emf.feature.group [2.28.0.v20211110-0654,2.28.0.v20211110-0654]
[ERROR] 
[ERROR] Failed to resolve target definition /home/dennis/Documents/Werk/Projects/org.eclipse.atl/releng/org.eclipse.m2m.atl.releng.parent/tp/org.eclipse.m2m.atl.tp.target: See log for details -> [Help 1]

https://wiki.eclipse.org/Tycho/Dependency_Resolution_Troubleshooting suggests that the target definition is inconsistent. I've since been experimenting with target platform definitions, and adding "JavaSE-11" as targetJRE seems to solve the dependency resolution problems, but then switches the Java compiler to version 1.5 source level (@Override on interface methods, multi-catch not supported):

[ERROR] Failed to execute goal org.eclipse.tycho:tycho-compiler-plugin:2.5.0:compile (default-compile) on project org.eclipse.m2m.atl.emftvm: Compilation failure: Compilation failure: 
[ERROR] /home/dennis/Documents/Werk/Projects/org.eclipse.atl/plugins/org.eclipse.m2m.atl.emftvm/src/org/eclipse/m2m/atl/emftvm/util/LazyOrderedSet.java:[1891] 
[ERROR] 	public void add(final int index, final E element) {
[ERROR] 	            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ERROR] The method add(int, E) of type LazyOrderedSet<E> must override a superclass method
...
[ERROR] /home/dennis/Documents/Werk/Projects/org.eclipse.atl/plugins/org.eclipse.m2m.atl.emftvm/src/org/eclipse/m2m/atl/emftvm/impl/EmftvmFactoryImpl.java:[1662] 
[ERROR] 	} catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException
[ERROR] 				| NoSuchMethodException | SecurityException | ClassNotFoundException e) {
[ERROR] 	         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[ERROR] Multi-catch parameters are not allowed for source level below 1.7

The PR can be found at https://git.eclipse.org/r/c/mmt/org.eclipse.atl/+/189434

Does anyone have any idea what is going on?

P.S. I found #205, but that removing the target definition is the starting situation in this case.