The development version 201408270001 does not correctly recognise a cast to an interface with type parameters.

Simple example (formatting from netbeans!):
    public Attribute<Object, ? extends Object> getSomething() {
        return ((Attribute < Object,  ? extends Object >


    )) null;
    }
The return line complains with the message "incompatible types: Attribute is not a functional interface"
and "multiple non-overriding abstract methods found in interface Attribute"
and "')' expected"

Maven has no problems (and Netbeans 8.0 did not complain either)

Attribute is the class javax.persistence.metamodel.Attribute with two type parameters.