org.gradle.api.plugins
Interfaces 
Convention
PluginCollection
PluginContainer
ProjectPluginsContainer
Classes 
DefaultConventionsToPropertiesMapping
EclipsePlugin
GroovyPlugin
JavaPlugin
MavenPlugin
MavenPluginConvention
ProjectReportsPlugin
ReportingBasePlugin
ReportingBasePluginConvention
WarPlugin
Exceptions 
PluginInstantiationException
UnknownPluginException