| Package | Description | 
|---|---|
| org.bukkit | More generalized classes in the API. | 
| org.bukkit.entity | Interfaces for non-voxel objects that can exist in a  world, including all players, monsters, projectiles, etc. | 
| org.bukkit.plugin.messaging | Classes dedicated to specialized plugin to client protocols. | 
| Class and Description | 
|---|
| Messenger A class responsible for managing the registrations of plugin channels and
 their listeners. | 
| PluginMessageRecipient Represents a possible recipient for a Plugin Message. | 
| Class and Description | 
|---|
| PluginMessageRecipient Represents a possible recipient for a Plugin Message. | 
| Class and Description | 
|---|
| Messenger A class responsible for managing the registrations of plugin channels and
 their listeners. | 
| PluginChannelDirection Represents the different directions a plugin channel may go. | 
| PluginMessageListener A listener for a specific Plugin Channel, which will receive notifications
 of messages sent from a client. | 
| PluginMessageListenerRegistration Contains information about a  Plugins registration to a plugin
 channel. | 
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