Gluu has ended community support for Gluu 4. See https://gluu.org/gluu-4/
Also, security updates for Gluu 4 binaries are now behind a paywall.
Please contact us if you want to purchase a support contract.
If you want to use free binaries: please move to the HEAD of the project at https://jans.io There are VM and cloud native assets in the [Releases](https://github.com/JanssenProject/jans/releases) section.
Community support for Janssen Project is moved to Gihub [Discussions](https://github.com/JanssenProject/jans/discussions)
BTW, cache refresh is experimental in Janssen--it's in the nightly build.