What is single bean?

A new instance is created for a single bean definition every time a request is made for that bean. Same object is shared for each request made for that bean. i.e. The same object is returned each time it is injected. For each new request a new instance is created. i.e. A new object is created each time it is injected.

What is Requestbean?

Request bean ver. 1.7 Java bean lets you proceed GET/POST requests to the specified host (cgi-script/servlet). So you can obtain for example content of some page and use extracted information in your own jsp page.

What is a bean in Spring boot?

A bean is an object that is instantiated, assembled, and otherwise managed by a Spring IoC container. Otherwise, a bean is simply one of many objects in your application. Beans, and the dependencies among them, are reflected in the configuration metadata used by a container.

How do you Autowire in Spring?

In Spring, you can use @Autowired annotation to auto-wire bean on the setter method, constructor , or a field . Moreover, it can autowire the property in a particular bean. We must first enable the annotation using below configuration in the configuration file. We have enabled annotation injection.

Can we use prototype bean in singleton bean?

You cannot dependency-inject a prototype-scoped bean into your singleton bean, because that injection occurs only once, when the Spring container is instantiating the singleton bean and resolving and injecting its dependencies.

What is @bean used for?

@Bean is used to mark a method as one that creates a bean and Spring will then add it to the context for us. The return type of the method defines the type of bean that is created, so both of the beans created in this example will be referred to by the type MyBean rather than their implementations.

What is the difference between @bean and @autowired?

@Bean is just for the metadata definition to create the bean(equivalent to tag). @Autowired is to inject the dependancy into a bean(equivalent to ref XML tag/attribute).

Is @component a singleton?

Yes, that is correct, @Component is a Spring bean and a Singleton. About singletons – spring beans are all in singleton scope by default.