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Spring > Learn Spring > What is autowire in spring and why it is needed?
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What is autowire in spring and why it is needed?

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Software Engineer

Brilliant feature of spring is dependency injection as for example if i have two component class say A and B. A want to call the method of B (say m1 method of B).In Class A I need to create the object of B like B b=new B(); then b.m1() i need to call,but problem with this statement my Class A is tightly...
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Brilliant feature of spring is dependency injection as for example if i have two component class say A and B. A want to call the method of B (say m1 method of B).In Class A I need to create the object of B like B b=new B(); then b.m1() i need to call,but problem with this statement my Class A is tightly couple with B. In order to resolve this issue there is a dependency injection concept where automatically B object will be created and injected into A class using either setter injection or constructor injection. This injection(setter and constructor) in spring is done through IOC container of Spring,but how spring will know which object (Dependency Class ) you want to inject in which class(Target Class). In our case we want to inject B class Object in A class. For that there is a two tag property tag or constructor tag to tell to spring which object I want to inject. i.e., i need to write some extra configuration to inject B class object i.e property or constructor tag. Without writing this extra cfg also I can tell to spring which object I want to inject and spring will be intelligent enough to identify which Dependency object I want to inject in Target Class. The concept which allows to do so is Autowire. read less
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The Spring container can autowire relationships between collaborating beans without using constructor-arg and property elements which helps cut down on the amount of XML configuration you write for a big Spring based application. In my view, Spring ‘auto-wiring’ make development faster with great costs...
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The Spring container can autowire relationships between collaborating beans without using constructor-arg and property elements which helps cut down on the amount of XML configuration you write for a big Spring based application. In my view, Spring ‘auto-wiring’ make development faster with great costs – it added complexity for the entire bean configuration file, and you don’t even know which bean will auto wired in which bean. In practice, I rather wire it manually, it is always clean and work perfectly, or better uses @Autowired annotation, which is more flexible and recommended. read less
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Instead of creating an object instance of some other class, If you give that class name with auto wired you can access that class methods etc. This comes under dependency injection in the springs. By using auto wired we can achieve this dependency injection.
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Autowiring is used to reduce the code in spring configuration file without writing property element and constructor element. It has five modes - no, by Name, by Type, constructor and auto detect
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First, and most important - all Spring beans are managed - they "live" inside a container, called "application context". Second, each application has an entry point to that context. Web applications have a Servlet, JSF uses a el-resolver, etc. Also, there is a place where the application context is...
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First, and most important - all Spring beans are managed - they "live" inside a container, called "application context". Second, each application has an entry point to that context. Web applications have a Servlet, JSF uses a el-resolver, etc. Also, there is a place where the application context is bootstrapped and all beans - autowired. In web applications this can be a startup listener. Autowiring happens by placing an instance of one bean into the desired field in an instance of another bean. Both classes should be beans, i.e. they should be defined to live in the application context. What is "living" in the application context? This means that the context instantiates the objects, not you. I.e. - you never make new UserServiceImpl() - the container finds each injection point and sets an instance there. read less
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B.Tech

It is a spring concept by which we are archiving loose coupling in our program. It gives us the flexibility to instantiate the object using XML (so need to mention Object class name) at the time of coding.
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Trainer

Autowiring is used to inject a class into other class like a new object.
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