Spring Integration 4.0 Milestone 2（M2）于2013年10月左右发布，是Spring Integration 4.0版本的第二个里程碑版本

Spring Integration 4.0 Milestone 2（M2）于2013年10月左右发布，是Spring Integration 4.0版本的第二个里程碑版本。该版本引入了多项重要更新与改进，主要包括：

• 全面支持Java 8：包括Lambda表达式、方法引用等语法特性，部分API开始适配函数式编程风格；
• Reactive Streams 集成初步探索：为后续与Project Reactor及响应式编程模型的整合奠定基础（虽正式响应式支持在5.0+才完善）；
• 增强的Stream/Files/FTP/SFTP模块：如Files模块新增FileReadingMessageSource的递归扫描支持、SFTP会话缓存优化；
• Kafka Binder 预研支持（非官方正式绑定，社区早期实验性集成）；
• DSL（Domain Specific Language）增强：Java DSL 提供更流畅的流定义方式，例如IntegrationFlow.from(...).handle(...).get()；
• 弃用旧API：如部分基于MessageHandler子类的模板化组件被标记为@Deprecated，推荐使用@ServiceActivator或DSL构建；
• 测试支持升级：IntegrationTestUtils和MockIntegration工具类增强，便于单元测试消息流。

注意：Milestone版本属于预发布版本，不建议用于生产环境；最终稳定版 Spring Integration 4.0 GA 发布于2014年4月。
Spring Integration 4.0 Milestone 2 is Now Available

Following the recent 3.0.0.RELEASE, we are pleased to announce that the second (first public) milestone of Spring Integration 4.0 is now available.

As mentioned in the 3.0 Release Candidate Announcement the recent Spring Integration 3.0 release is fully compatible with Spring Framework 4.0, but it does not use the spring-messaging module. This allows Spring Integration 3.0 to be used with earlier versions of Spring Framework.

The 4.0 stream from which this milestone is built replaces all the core Spring Integration messaging abstractions with those in the spring-messaging module. The reason for another major release so soon after 3.0 is based on the fact that existing applications that directly use the affected SI classes in their code will need to convert to the Spring Framework abstractions. For the most part, this just means package changes in import statements, but full details are provided in the Migration Guide. Users who don’t directly reference the classes, and use the namespace support for all configuration, will not be affected.

This early milestone is functionally equivalent to the recent 3.0.0.RELEASE and is provided for those users that want to develop against Spring Framework 4 and/or directly process STOMP messages with a Spring Integration flow.

Changes since 3.0.0.RELEASE can be seen in the release notes.

The master Github branch is now for 4.0 development; the 3.0 code base can be found on the 3.0.x branch.
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