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Packages 
Package Description
com.rabbitmq.client
The client API proper: classes and interfaces representing the AMQP connections, channels, and wire-protocol framing descriptors.
com.rabbitmq.client.impl
Implementations of interfaces specified in the client API, and their supporting classes.
com.rabbitmq.client.impl.nio
NIO network connector.
com.rabbitmq.client.impl.recovery
Implementation of connection and topology recovery.
com.rabbitmq.client.observation  
com.rabbitmq.tools.json
JSON reader/writer and utility classes.
com.rabbitmq.tools.jsonrpc
JSON-RPC client and server classes for supporting JSON-RPC over an AMQP transport.
com.rabbitmq.utility
Utility package of helper classes, mostly used in the implementation code.