Spring 3.0 was a major release of the Spring Framework, a comprehensive programming and configuration model for building enterprise Java applications. It introduced several key features and improvements, including support for Java 5+ features like generics and annotations, RESTful web services development with @RequestMapping and related annotations, improved dependency injection capabilities, enhanced transaction management, and a more streamlined configuration model often using XML namespaces and Java-based configuration. It is commonly used for building web applications, microservices, enterprise applications, and batch processing systems by providing a foundation for handling dependencies, transactions, security, and data access, ultimately simplifying Java enterprise development.
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