Question: Can A Bean Have Multiple Names?

Can we create two beans with same name?

Spring would not let you define multiple bean definitions of same bean with same name in the same spring configuration file..

How do I Autowire specific beans?

In Springs latest version, we can autowire a bean using annotation as @Autowired . This will autowire the bean using its type(or constructor, if applied on it).

What are the bean scopes in spring?

Spring – Bean ScopesSr.No.Scope & Description1singleton This scopes the bean definition to a single instance per Spring IoC container (default).2prototype This scopes a single bean definition to have any number of object instances.3 more rows

What is difference between @inject and @autowired?

The @Autowired annotation is used for auto-wiring in Spring framework. … The @Inject annotation also serves the same purpose, but the main difference between them is that @Inject is a standard annotation for dependency injection and @Autowired is spring specific.

How bean is created in spring boot?

The objects that form the backbone of your application and that are managed by the Spring IoC container are called beans. A bean is an object that is instantiated, assembled, and otherwise managed by a Spring IoC container. These beans are created with the configuration metadata that you supply to the container.

Which one is true about lazy initialization of beans?

2. Lazy Initialization. By default in Spring, all the defined beans, and their dependencies, are created when the application context is created. In contrast, when we configure a bean with lazy initialization, the bean will only be created, and its dependencies injected, once they’re needed.

What is the @bean annotation?

@Bean is a method-level annotation and a direct analog of the XML element. The annotation supports most of the attributes offered by , such as: init-method , destroy-method , autowiring , lazy-init , dependency-check , depends-on and scope .

Are all spring beans singletons?

Spring’s default scope is singleton. … Here is how the Spring documentation defines singleton scope: Only one shared instance of a singleton bean is managed, and all requests for beans with an id or ids matching that bean definition result in that one specific bean instance being returned by the Spring container.

What is spring bean life cycle?

Advertisements. The life cycle of a Spring bean is easy to understand. When a bean is instantiated, it may be required to perform some initialization to get it into a usable state. Similarly, when the bean is no longer required and is removed from the container, some cleanup may be required.

What is the use of @bean?

The name “Bean” was given to encompass this standard, which aims to create reusable software components for Java. It is a reusable software component written in Java that can be manipulated visually in an application builder tool.

What is bean in spring?

In Spring, the objects that form the backbone of your application and that are managed by the Spring IoC container are called beans. 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.

The reasons why field injection is frowned upon are as follows: You cannot create immutable objects, as you can with constructor injection. Your classes have tight coupling with your DI container and cannot be used outside of it. Your classes cannot be instantiated (for example in unit tests) without reflection.

Can’t Autowire there is more than one bean?

5 Answers. If you use @Autowired , Spring searches for a bean matching the type of the field you want to autowire. In your case there is more than one bean of the type BaseInterface . … In such a situation you have no other choice to explicitly state the bean Spring should use or resolve the ambiguity.

What is the difference between @bean and Autowired?

Annotating @Bean only registers the service as a bean(kind of an Object) in spring application context. … Annotating a variable with @Autowired injects a BookingService bean(i.e Object) from Spring Application Context.

What is the difference between @component and @bean?

@Component is a class level annotation whereas @Bean is a method level annotation and name of the method serves as the bean name. @Component need not to be used with the @Configuration annotation where as @Bean annotation has to be used within the class which is annotated with @Configuration.

Is Singleton bean thread safe?

Spring singleton beans are NOT thread-safe just because Spring instantiates them. Sorry. Spring just manage the life cycle of singleton bean and maintains single instance of object. Thread safety has nothing to do with it.

What is difference between @configuration and @component?

@Component Indicates that an annotated class is a “component”. Such classes are considered as candidates for auto-detection when using annotation-based configuration and classpath scanning. A @Configuration is also a @Component, but a @Component cannot act like a @Configuration.

How many ways can you make a bean in spring?

Spring Framework provides three ways to configure beans to be used in the application. Annotation Based Configuration – By using @Service or @Component annotations. Scope details can be provided with @Scope annotation. XML Based Configuration – By creating Spring Configuration XML file to configure the beans.