Weld should give better error message about why it can't proxy a class

For a bean like

@Entity
@Named
@RequestScoped
public class Plot extends RObject {
...
}

we get an error like

Caused by: javax.enterprise.inject.UnproxyableResolutionException: Normal scoped bean org.jboss.weld.bean-/home/ss141213/NetBeansProjects/ear1/dist/gfdeploy/ear1/ear1-ejb_jar/-ManagedBean-class org.vgcowa.dm.Plot is not proxyable

which was caused by a final method.

Not a useful error message!