Spring Framework 4.x was a major release of the Spring Framework, a comprehensive Java application framework. It provided features for building enterprise Java applications, including dependency injection, aspect-oriented programming, data access, and web development. Key improvements over earlier versions included support for Java 8 features (like lambdas and streams), WebSocket integration, improved testing support, and enhanced RESTful web service capabilities. Spring 4.x is commonly used for building robust, scalable, and maintainable server-side applications, microservices, and web applications.
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