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@jonasfugedi Thanks very much for your first contribution to Spring Boot. I've merged it along with a polishing commit for style and a small bit of additional testing.

public List<Address> getAddresses() {
	List<Address> addresses = new ArrayList<>();
	for (String address : this.properties.determineAddresses().split(",")) {
		int portSeparatorIndex = address.lastIndexOf(':');
		String host = address.substring(0, portSeparatorIndex);
		String port = address.substring(portSeparatorIndex + 1);
		addresses.add(new Address(host, Integer.parseInt(port)));
	}
	return addresses;
}

Is it possible for an IPv6 address to be specified without a port (i.e. use the default port)? Wouldn't this code fail in that scenario, since it'd split on a colon that's part of the IP address, and not related to the port?

public List<Address> getAddresses() {
	List<Address> addresses = new ArrayList<>();
	for (String address : this.properties.determineAddresses().split(",")) {
		int portSeparatorIndex = address.lastIndexOf(':');
		String host = address.substring(0, portSeparatorIndex);
		String port = address.substring(portSeparatorIndex + 1);
		addresses.add(new Address(host, Integer.parseInt(port)));
	}
	return addresses;
}

Is it possible for an IPv6 address to be specified without a port (i.e. use the default port)? Wouldn't this code fail in that scenario, since it'd split on a colon that's part of the IP address, and not related to the port?

Not if I read the code correct, the source of the addresses is

https://github.com/jonasfugedi/spring-boot/blob/bebca55a8ffee3b4cd4d099fb6be199655cf8c7d/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/amqp/RabbitProperties.java#L207-L225

Which ensures a port is always appended to the host. Previous behavior was retained, i.e. I kept the same assumptions as the code did before except I needed it to work when using ipv6 addresses.