If there's more than one bean of that type, the framework throws an exception. This means Spring will look for a bean with the same type of the property to set.

byType: similar to the byName autowiring, only based on the type of the property.

byName: autowiring is done based on the name of the property, therefore Spring will look for a bean with the same name as the property that needs to be set.

no: the default value – this means no autowiring is used for the bean and we have to explicitly name the dependencies.

There are four modes of autowiring a bean using an XML configuration:

Wiring allows the Spring container to automatically resolve dependencies between collaborating beans by inspecting the beans that have been defined. We can achieve Inversion of Control through various mechanisms such as: Strategy design pattern, Service Locator pattern, Factory pattern, and Dependency Injection (DI). greater ease in testing a program by isolating a component or mocking its dependencies, and allowing components to communicate through contracts.making it easier to switch between different implementations.decoupling the execution of a task from its implementation.

If we want to add our own behavior, we need to extend the classes of the framework or plugin our own classes. To enable this, frameworks use abstractions with additional behavior built in. In contrast with traditional programming, in which our custom code makes calls to a library, IoC enables a framework to take control of the flow of a program and make calls to our custom code. We most often use it in the context of object-oriented programming.

Inversion of Control is a principle in software engineering which transfers the control of objects or portions of a program to a container or framework.

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