Spring Integration 4.3 to 5.0 Migration Guide

IntegrationMessageHeaderAccessor.CLOSEABLE_RESOURCE value typo

The closableResource typo in the IntegrationMessageHeaderAccessor.CLOSEABLE_RESOURCE constant value has been fixed to the proper closeableResource. If application doesn't use IntegrationMessageHeaderAccessor.CLOSEABLE_RESOURCE to access to an appropriate header, it is recommended to review any closableResource typo usage.

JMS Default Connection Factory Bean Name

JMS components can be configured using XML with no connection factory property; the framework uses a default bean name. Prior to version 5.0, this default bean name was connectionFactory. In order to align with Spring Boot's auto configuration, which configures a bean called jmsConnectionFacrory, Spring Integration now uses that bean name as the default. If your application relied on the previous behavior, you will need to rename your bean to jmsConnectionFactory or change the component definitions to explicitly reference your bean.

Reactor 3.0 support

The Reactor 2.0 isn't supported any more. The Messaging Gateway Promise return type from Reactor 2.0 has been replaced with the Mono type from Reactor 3.0. For all the Reactive Streams changes for new Mono type, please, refer to the Reactor Project Site.