- What is @bean in spring boot?
- What is a bean in spring?
- What is the difference between @configuration and @component?
- What is difference between @SpringBootApplication and @EnableAutoConfiguration?
- How do I override application properties in spring boot?
- Why bean class is used in Java?
- What is @configuration in spring boot?
- What is @ComponentScan?
- What is the difference between @component and @ComponentScan?
- What is @RestController?
- What is SpringBootApplication?
- What is the use of @component?
- What is difference between @bean and @component?
- What is the use of configuration?
- What is EnableAutoConfiguration?
What is @bean in spring boot?
Spring @Bean annotation tells that a method produces a bean to be managed by the Spring container.
It is a method-level annotation.
During Java configuration ( @Configuration ), the method is executed and its return value is registered as a bean within a BeanFactory ..
What is a 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.
What is the 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. @Configuration – It is like beans. … @Component – You cannot autowire (@Autowired) any class if it is not marked with @Component.
What is difference between @SpringBootApplication and @EnableAutoConfiguration?
2. The @SpringBootApplication is a combination of three annotations @Configuration (used for Java-based configuration), @ComponentScan (used for component scanning), and @EnableAutoConfiguration (used to enable auto-configuration in Spring Boot).
How do I override application properties in spring boot?
Update with Spring Boot 2.2. 2. Release.This does not work anymore. … If you want to override with –spring.config.location=classpath:application.properties,/opt/somewhere/override.properties you have to override all the properties in the new file present in the default file – homeOfTheWizard Jul 15 at 10:26.More items…•
Why bean class is used in Java?
Why use JavaBean? According to Java white paper, it is a reusable software component. A bean encapsulates many objects into one object so that we can access this object from multiple places. Moreover, it provides easy maintenance.
What is @configuration in spring boot?
@Configuration annotation indicates that a class declares one or more @Bean methods and may be processed by the Spring container to generate bean definitions and service requests for those beans at runtime. … This is called Spring Java Config feature (using @Configuration annotation).
What is @ComponentScan?
The @ComponentScan annotation is used with the @Configuration annotation to tell Spring the packages to scan for annotated components. @ComponentScan also used to specify base packages and base package classes using thebasePackageClasses or basePackages attributes of @ComponentScan.
What is the difference between @component and @ComponentScan?
Using the annotation @ComponentScan , you can tell Spring where do your Spring-managed components lie. … On the other hand, @Component is a generic annotation for any Spring-Managed component. For example – If you create a class called Testing inside the package com. example.
What is @RestController?
Spring RestController annotation is a convenience annotation that is itself annotated with @Controller and @ResponseBody . This annotation is applied to a class to mark it as a request handler. Spring RestController annotation is used to create RESTful web services using Spring MVC.
What is SpringBootApplication?
Spring Boot @SpringBootApplication annotation is used to mark a configuration class that declares one or more @Bean methods and also triggers auto-configuration and component scanning.
What is the use of @component?
Spring Component annotation is used to denote a class as Component. It means that Spring framework will autodetect these classes for dependency injection when annotation-based configuration and classpath scanning is used.
What is difference between @bean and @component?
@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.
What is the use of configuration?
Configuration files can be used for a wide range of reasons, though they are mostly used by operating systems and applications to customize the environment. Configuration files are used for operation system settings, server processes or software applications.
What is EnableAutoConfiguration?
Annotation Type EnableAutoConfiguration Enable auto-configuration of the Spring Application Context, attempting to guess and configure beans that you are likely to need. Auto-configuration classes are usually applied based on your classpath and what beans you have defined. For example, if you have tomcat-embedded.