Running ColdBox 4.2 we were seeing this error after reinit, but only on one specific handler cfc. If we reinit several times it would eventually go away, which sounds like a race condition.
We thought of just doing extends="coldbox.system.EventHandler"
directly rather than letting the framework mix in the handler methods, but then we began seeing another error:
Error building: myApp.handlers.admin.report -> The CONTROLLER parameter to the init function is required but was not passed in. with constructor arguments: {}
Similarly, this error would go away if we reinit a few times until we get one where things finish baking before a request comes in midway through the init.
We're not able to reproduce this on non-prod systems, likely due to substantially lower load.
Has anyone run into similar things and figured out a way to gracefully reinit the framework under load?