Jakarta EL 6.0 is out. We've considered just using the API artifact from Jakarta, but it doesn't include caching behavior we've long used in WildFly, and in particular its BeanELResolver retains references to deployment classes (and thus classloaders) until memory pressure forces their release, which is not really what we want in WF. Our fork ensures that caches are cleared on undeploy.

See also https://wildfly.zulipchat.com/#narrow/stream/242838-Jakarta-EE/topic/Expression.20Language.206.2E0/near/441269422 and https://github.com/jakartaee/expression-language/pull/215