We made a change yesterday so that trunk now requires Java 11, no longer supporting Java 8. This is in preparation for our 19.1 release, which will support only Java 11 and 12. If you build LabKey Server from trunk, or build Java modules that need to run on trunk builds, you will need to install Java 11 on your development machine: https://jdk.java.net/11 You will also need to upgrade test, staging, and production servers before deploying any post-18.3 build. You can run Java 11 and 8 side-by-side in case you still need to run 18.2 or older versions.

For more information, see the 18.3 Release Notes, our Supported Technologies page, or this post on the LabKey blog:

https://www.labkey.com/the-java-shake-up-what-it-means-to-labkey-and-you/

Let us know if you have any questions.

Thanks,
Adam