SCR -Dependency injection

Constructor Injection

• It does not allow you to construct object until the dependency are ready. Partial injection is not possible.

• Every time the constructor is called and new object is created, hence the dependency can’t be overridden. Constructor injection is immutable.

• It uses the Index to inject the dependency.

• If there are more number dependencies constructor injection will be the better one since for setter we need to have more setter properties.

• primitive and String-based values, Dependent object (contained object),Collection values etc. can be injected using constructor injection.

Setter Injection

• Setter injections are more readable since the field name will be same in the setter method.

• Setter injection doesn’t ensure that all the dependencies are injected. Dependency injection may be incomplete. Partial injection is allowed.

• Setter injection overrides the constructor injection in case both are used in the application.

• Values can be easily modified using setter injection. It doesn’t not create a new bean instance always as constructor injection. Setter injection is mutable.

• Primitive and String-based values, Dependent object (contained object),Collection values etc. can be injected using setter injection.