SpringBoot NumberFormatException when configuring spring.rabbitmq.addresses with an IPv6 address

This yaml works

spring:
  rabbitmq:
    host: "[aaaa:bbbb:cccc::d]"
    port: 5672
    username: foo
    password: "bar

but this yaml

spring:
  rabbitmq:
    addresses: "amqp://foo:bar@[aaaa:bbbb:cccc::d]:5672"

fails with

Failed to bind properties under 'spring.rabbitmq' to org.springframework.boot.autoconfigure.amqp.RabbitProperties:
    Property: spring.rabbitmq.addresses
    Value: amqp://foo:bar@[aaaa:bbbb:cccc::d]:5672
    Origin: REDACTED
    Reason: java.lang.NumberFormatException: For input string: "bbbb:cccc::d]:5672"

Comment From: bantu

This issue is somewhat similar to #6401 which concerns amqps in spring.rabbitmq.addresses.

Comment From: bantu

https://github.com/rabbitmq/rabbitmq-java-client/issues/385 is also similar. Maybe this work can be reused somehow.

Comment From: philwebb

That NumberFormatException is from our own parsing logic. I've refined parseHostAndPort so that the last : instead of the first one is used to locate the port number.

@bantu When the next CI build finishes (should be about an hour) could you give the latest SNAPSHOT a try to see if it solves it?

Comment From: bantu

@philwebb Thank you for the quick patch. Is there an easy way to use SNAPSHOT by altering my build.gradle?

Comment From: snicoll

@bantu generate a sample project on start.spring.io with the Spring Boot version you want to test.

Comment From: bantu

@snicoll Excellent. Thanks.

@philwebb I can confirm that this works:

spring:
  rabbitmq:
    addresses: "amqp://foo:bar@[aaaa:bbbb:cccc::d]:5672"

as well as

spring:
  rabbitmq:
    addresses: "foo:bar@[aaaa:bbbb:cccc::d]:5672"

but omitting the port like

spring:
  rabbitmq:
    addresses: "foo:bar@[aaaa:bbbb:cccc::d]"

fails with java.lang.NumberFormatException: For input string: "d]". I am not sure whether that is a regression from your patch.