What is the OpenWire protocol?

OpenWire is ActiveMQ's native, binary wire protocol optimized for Java clients. It's the default transport when connecting via the standard tcp:// URL and generally offers lower overhead than text-based protocols like STOMP because it encodes JMS objects directly rather than serializing to text.

Because it's ActiveMQ-specific, OpenWire clients aren't portable to other brokers, so cross-broker integrations typically fall back to AMQP or STOMP instead.

OpenWire also supports advanced JMS features like message compression and prioritized delivery natively, which is one reason performance-sensitive Java applications default to it rather than switching to a cross-language protocol.

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