Hi,apparently m2eclipse requires the Java version to be specified as <maven.compiler.target>9</maven.compiler.target>, otherwise the build fails in Eclipse.
As I understand this matter, "9" is the correct version number: https://github.com/eclipse/m2e-core/commit/1f299d8e8140e198880d08d299df5177460d5d8fAny objections changing this for wicket-9.x? For me "9" works in Eclipse and with mvn on the command line too.
Thanks Sven
