Hi I work on ONAP a Linux Foundation Open Source project that pulls in logback for use in its projects.

I would also like to add to this request to upgrade to a more newer version of the checker framework. The

`edu.washington.cs.types.checker` - `checker-framework.1.7.0` LICENSE is not compatible for Linux Foundation projects due to its GPL-2.0 license.

Their newer versions are MIT License which would work and also not conflict with guava. Guava does include the newere versions 2.11.0 is include with guava 29.0-jre

If we can help with this upgrade, please let us know. Thanks for your consideration in this.