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xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.3.xsd"
                                                             ^^^^^ NO!!!

Web/Controllers

1. In a Spring MVC web application, controller classes should not extend any Spring framework classes.
2. Controller classes should be identified to Spring as a controller bean by using the @Controller annotation.
3. Request URLs should be mapped to controller classes and methods by using the @RequestMapping annotation.
4. Generally speaking, we aim to configure controllers by using annotations.
5. We should use the @Autowired annotation for injected dependencies.
6. As controllers are typically configured as singletons in the Spring context, the classes should be thread-safe. In practical terms, this means fields, or instance variables, should never maintain any state, and they should not be instantiated by the new  operator. The only instance variables in a controller should be other Spring beans, injected by the Spring container. Typically these will be service classes or helper classes.
7. Controllers should not contain any business logic - they should be concerned with UI-related logic. Business logic should be delegated to service classes.

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