groovy.lang
Interfaces 
AdaptingMetaClass
Buildable
ClosureInvokingMethod
GroovyCallable
GroovyInterceptable
GroovyObject
GroovyResourceLoader
Interceptor
MetaClass
MetaClassRegistry
MetaClassRegistryChangeEventListener
MetaObjectProtocol
MutableMetaClass
PropertyAccessInterceptor
Range
Writable
Classes 
BenchmarkInterceptor
Binding
Closure
DelegatingMetaClass
EmptyRange
ExpandoMetaClass
ExpandoMetaClass.ExpandoMetaConstructor
ExpandoMetaClass.ExpandoMetaProperty
ExpandoMetaClassCreationHandle
GString
GroovyClassLoader
GroovyClassLoader.ClassCollector
GroovyClassLoader.InnerLoader
GroovyCodeSource
GroovyLogTestCase
GroovyObjectSupport
GroovyShell
GroovySystem
IntRange
ListWithDefault
MapWithDefault
MetaArrayLengthProperty
MetaBeanProperty
MetaClassImpl
MetaClassImpl.Index
MetaClassImpl.MetaConstructor
MetaClassRegistry.MetaClassCreationHandle
MetaClassRegistryChangeEvent
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
Annotation Types 
Category
Delegate
DelegatesTo
DelegatesTo.Target
Grab
GrabConfig
GrabExclude
GrabResolver
Grapes
Lazy
Mixin
Newify
Singleton