Development environment suddenly requires Java11 after Oomph refresh
Eclipse Oomph (v1.17; Eclipse 2020-06) depends on the Eclipse Nebula TableCombo widget using a version range of [1.0.0,2.0.0). As of version 1.2.0.202208171909 of org.eclipse.nebula.widgets.tablecombo, Java11 is required, see https://github.com/eclipse/nebula/issues/408. This causes an indirect dependency on Java11, breaking existing Java8 installations.
A bug has been reported on Eclipse Oomph which is closed with WONTFIX, see https://bugs.eclipse.org/bugs/show_bug.cgi?id=580596
As solution, the version of org.eclipse.nebula.widgets.tablecombo should be bound to 1.2.0.202208171809 (part of Eclipse Nebula release 2.7.2; "last one that runs with Java 8").