This is major annoyance, since it happens all the time when Java generics is used with anonymous inner classes, e.g. ad-hoc generic interface implementation.
org.zkoss.zel.BeanELResolver.getMethod() never finds a method if generics is used, and in this case it logs stack trace to console, which COULD NOT be disabled
and therefore produces wrong perception that something is really wrong with application, both to developers and support staff. Please remove this stack trace logs
or make them go through ZK logging mechanism to give developers opportunity to disable them.