groovy.lang
Interfaces 
AdaptingMetaClass
Buildable
ClosureInvokingMethod
ExpandoMetaClass.Callable
GroovyInterceptable
GroovyObject
GroovyResourceLoader
Interceptor
MetaClass
MetaClassRegistry
MetaObjectProtocol
MutableMetaClass
PropertyAccessInterceptor
ProxyMetaClass.Callable
Range
Writable
Classes 
BenchmarkInterceptor
Binding
Closure
DelegatingMetaClass
EmptyRange
ExpandoMetaClass
ExpandoMetaClassCreationHandle
GroovyClassLoader
GroovyClassLoader.ClassCollector
GroovyClassLoader.InnerLoader
GroovyCodeSource
GroovyObjectSupport
GroovyShell
GroovySystem
GString
IntRange
MetaArrayLengthProperty
MetaBeanProperty
MetaClassImpl
MetaClassImpl.DummyMetaMethod
MetaClassImpl.Index
MetaClassRegistry.MetaClassCreationHandle
MetaExpandoProperty
MetaMethod
MetaProperty
NonEmptySequence
ObjectRange
ParameterArray
PropertyValue
ProxyMetaClass
Reference
Script
Sequence
SpreadMap
TracingInterceptor
Tuple
Exceptions 
ClosureException
DeprecationException
GroovyRuntimeException
IllegalPropertyAccessException
IncorrectClosureArgumentsException
MissingClassException
MissingFieldException
MissingMethodException
MissingPropertyException
ReadOnlyPropertyException
SpreadListEvaluatingException
SpreadMapEvaluatingException
StringWriterIOException