groovy.lang
Interfaces 
GroovyObject
Range
Writable
Classes 
Binding
Closure
CompilerConfig
GroovyClassLoader
GroovyClassLoader.ClassCollector
GroovyObjectSupport
GroovyShell
GString
IntRange
MetaClass
MetaClassRegistry
MetaMethod
MetaProperty
NonEmptySequence
ObjectRange
Reference
Script
Sequence
Tuple
Exceptions 
ClosureException
GroovyRuntimeException
IncorrectClosureArgumentsException
MissingClassException
MissingMethodException
MissingPropertyException
ReadOnlyPropertyException
StringWriterIOException