groovy.lang
Interfaces 
GroovyObject
Range
Classes 
Closure
GroovyClassLoader
GroovyClassLoader.ClassCollector
GroovyLog
GroovyObjectSupport
GroovyShell
GString
IntRange
MetaClass
MetaClassRegistry
NonEmptySequence
ObjectRange
Reference
Script
ScriptContext
Sequence
Tuple
Exceptions 
ClosureException