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If there is no constructor defined in a bean, the autowire byType mode is chosen. For the option 2, how will I pass the dynamic values? In this case you're asking Spring to create SecondBean instance, and to do that it needs to create a Bean instance. Autowiring can be done by using the @Autowired annotation, which is available in the org.springframework.beans.factory.annotation package. This means that it is possible to automatically let Spring resolve collaborators (other beans) for your beans by inspecting the contents of the BeanFactory. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Autowire 2 instances of the same class in Spring, Autowire class with arguments in constructor fails. You will need to ensure both of these classes are on the component scan path, or else spring boot won't attempt to make beans of these classes. Another Option: you can also use the XML Configuration to wire the beans: You need to specify this bean in the constructor: Option 1: Directly allow AnotherClass to be created with a component scan. This is one of the most powerful ways to use Spring to write Extensible code which follows the Open/Closed Principle. It calls the constructor having a large number of parameters. thanks..I just don't understand why I need to put Autowired on the Bean as well..I am not injecting a bean into the Bean class. Lets take a look at an example to understand this concept better. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. "http://www.w3.org/2001/XMLSchema-instance", "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd", To enable @Autowired annotation in Spring Framework we have to use <, "http://www.springframework.org/schema/beans", "http://www.springframework.org/schema/context", "http://www.springframework.org/schema/beans, https://www.springframework.org/schema/beans/spring-beans.xsd, http://www.springframework.org/schema/context, https://www.springframework.org/schema/context/spring-context.xsd", //Creating Instance of ApplicationContext Spring Container, //Asking Spring Container to return Spring bean with Specific Id or name. In the case of a multi-arg constructor or method, the required() attribute is applicable to all arguments.