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Spring

Basic idea

Inversion-of-control container plus a layered set of modules for building enterprise/JVM applications. You declare your beans; Spring instantiates and wires them.

Key facts

  • IoC + DI via the ApplicationContext.

  • AOP weaving for cross-cutting concerns (transactions, security).

  • Annotations drive most configuration: @Bean, @Autowired, @Configuration, @Component.

  • Spring Boot adds auto-config, starter POMs, and an embedded Tomcat/Jetty.

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