The embedded Undertow server has the jakarta.servlet:jakarta.servlet-api. However, that is required at runtime. The POM should have a runtime dependency on jakarta.servlet:jakarta.servlet-api.

Also check the resteasy-undertow-cdi dependencies. The jakarta.inject:jakarta.inject-api dependency should likely be exposed. This actually would need to happen in the org.jboss.resteasy:resteasy-cdi module.