Tried to compile the following within the groovy console public interface SomeInterface<T> { List someMethod(T entity); } the following error comes up: "org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed, Script1: 1: Unexpected node type: TYPE_PARAMETERS found when expecting type: OBJBLOCK at line: 1 column: 31. File: Script1 @ line 1, column 31." If you compile the interface with java and try to implement the interface from a groovy class, another error comes up: "Can't have an abstract method in a non-abstract class."