Configuration metadata
The Spring IoC container consumes a form of configuration metadata; this configuration metadata represents how you as an application developer tell the Spring container to instantiate, configure, and assemble the objects in your application.
Configuration metadata is traditionally supplied in a simple and intuitive XML format, which is what most of this chapter uses to convey key concepts and features of the Spring IoC container.
For information about using other forms of metadata with the Spring container, see:
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Annotation-based configuration: Spring 2.5 introduced support for annotation-based configuration metadata.
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Java-based configuration: Starting with Spring 3.0, many features provided by the Spring JavaConfig project became part of the core Spring Framework. Thus you can define beans external to your application classes by using Java rather than XML files. To use these new features, see the
@Configuration,@Bean,@Importand@DependsOnannotations.