Starting with 2022-09 release projects contributing to the SimRel will be permitted to have BREE up to and including Java 17. For 2022-06 the maximum BREE is Java 11. The Eclipse EPP packages already include Java 17 (some since 2021-12, all except Scout since 2022-03).
The SimRel release requirements have been updated following approval at last weeks Planning Council meeting. Thank you Mickael and the TM4E project for highlighting this issue with plenty of time to plan and prepare for this.
Quoting from  this is the entry in the release requirements:
- The maximum BREE up to and including the 2022-06 release is Java 11.
- Starting in 2022-09, BREE up to and including Java 17
- Starting in 2024-06, BREE up to and including Java 21 (assuming Java 21 remains the LTS release and it is released in Sept 2023 as currently planned)
- and going forward the first Eclipse SimRel release to allow an LTS will be 6-9 months later.