org.gradle.api
Interfaces 
Action
Buildable
DomainObjectCollection
DomainObjectContainer
Plugin
Project
ProjectAction
ProjectEvaluationListener
Rule
Task
TaskAction
Transformer
Classes 
AntBuilder
ClosureTaskAction
DefaultTask
Enums 
JavaVersion
PathValidation
Exceptions 
CircularReferenceException
GradleException
GradleScriptException
IllegalDependencyNotation
IllegalOperationAtExecutionTimeException
InvalidUserDataException
UncheckedIOException
UnknownDomainObjectException
UnknownProjectException
UnknownTaskException