org.mule.api
Interfaces 
Acceptor
AnnotatedObject
EncryptionStrategy
EndpointAnnotationParser
ExceptionPayload
MessageProcessorAnnotationParser
MuleContext
MuleEvent
MuleEventContext
MuleEventKeyGenerator
MuleMessage
MuleMessageCollection
MuleSession
NameableObject
NamedObject
ThreadSafeAccess
Classes 
FutureMessageResult
SingleResourceTransactionFactoryManager
ThreadSafeAccess.AccessControl
Exceptions 
AnnotationException
DefaultMuleException
MessagingException
MuleException
MuleRuntimeException