org.gradle.api.plugins
Interfaces 
Convention
ExtensionAware
ExtensionContainer
ExtraPropertiesExtension
MavenRepositoryHandlerConvention
ObjectConfigurationAction
PluginCollection
PluginContainer
Classes 
GroovyBasePlugin
GroovyPlugin
JavaBasePlugin
JavaPlugin
MavenPlugin
MavenPluginConvention
ProjectReportsPlugin
ReportingBasePlugin
ReportingBasePluginConvention
WarPlugin
Exceptions 
ExtraPropertiesExtension.UnknownPropertyException
PluginInstantiationException
UnknownPluginException