filmov
tv
Annotations in Spring Boot Interview Questions and Answers | Code Decode | Part -2
Показать описание
In this video of code decode of Annotations in Spring boot Interview Questions and Answers we have covered some common interview questions regarding spring boot annotations
Udemy Course of Code Decode on Microservice k8s AWS CICD link:
Course Description Video :
It’s the way to implement Dependency Injection in spring / spring boot application.
Container will provide the required bean to dependent bean at runtime
Spring provides annotation-based auto-wiring by providing @Autowired annotation.
It is used to autowire spring bean on setter methods, instance variable, and constructor.
When we use @Autowired annotation, the spring container auto-wires the bean by matching data-type.
How will container autowire the required bean in dependent bean at runtime ? It first need to create beans during startup so that it can provide beans at later stage.
How will container know who POJO / java class should be considered as bean and whom to ignore ?
@Component: It is a class-level annotation.
It is used to mark a Java class as a bean.
A Java class annotated with @Component is found during the classpath.
The Spring Framework pick it up and configure it in the application context as a Spring Bean.
It is a generic stereotype for any Spring-managed component. The specializations are @Controller, @Service, @Repository
The @Controller is a class-level annotation.
It is a specialization of @Component.
It marks a class as a web request handler. It is often used to serve web pages. It is used in conjunction with @RequestMapping annotation.
We also use @RestController when we need to send response in JSON format directly.
By default, @Controller returns a string that indicates which route to redirect. Its used mostly with JSPs. It returns URL to new JSP page where it has to be redirected
They are nothing but the specialized form of @Component annotation for certain situations. Instead of using @Component on a controller class in Spring MVC, we use @Controller, which is more readable and appropriate.
The @Controller is a class-level annotation.
It is a specialization of @Component.
It marks a class as a web request handler. It is often used to serve web pages. It is used in conjunction with @RequestMapping annotation.
We also use @RestController when we need to send response in JSON format directly.
They are nothing but the specialized form of @Component annotation for certain situations. Instead of using @Component on a controller class in Spring MVC, we use @Controller, which is more readable and appropriate.
By using @Controller annotation we do two things,
We declare that this class is a Spring bean and should be created and maintained by Spring ApplicationContext,
We indicate that its a controller in MVC setup. This latter property is used by web-specific tools and functionalities.
DispatcherServlet will look for @RequestMapping on classes that are annotated using @Controller but not with @Component.
This means @Component and @Controller are the same with respect to bean creation and dependency injection but @Controller is a specialized form of @Component. Even if you replace @Controller annotation with @Compoenent, Spring can automatically detect and register the controller class but it may not work as you expect with respect to request mapping.
It is also used at class level.
It is a specialization of @Component.
It tells the Spring that class contains the business logic.
But at the end The main task of this annotation is also to mark the class capable to become a bean in Spring container similar to component. We can use @component also and it will work the same as this annotation does.
Subscriber and Follow Code Decode
#annotations #codedecode #springbootinterviewquestions
Udemy Course of Code Decode on Microservice k8s AWS CICD link:
Course Description Video :
It’s the way to implement Dependency Injection in spring / spring boot application.
Container will provide the required bean to dependent bean at runtime
Spring provides annotation-based auto-wiring by providing @Autowired annotation.
It is used to autowire spring bean on setter methods, instance variable, and constructor.
When we use @Autowired annotation, the spring container auto-wires the bean by matching data-type.
How will container autowire the required bean in dependent bean at runtime ? It first need to create beans during startup so that it can provide beans at later stage.
How will container know who POJO / java class should be considered as bean and whom to ignore ?
@Component: It is a class-level annotation.
It is used to mark a Java class as a bean.
A Java class annotated with @Component is found during the classpath.
The Spring Framework pick it up and configure it in the application context as a Spring Bean.
It is a generic stereotype for any Spring-managed component. The specializations are @Controller, @Service, @Repository
The @Controller is a class-level annotation.
It is a specialization of @Component.
It marks a class as a web request handler. It is often used to serve web pages. It is used in conjunction with @RequestMapping annotation.
We also use @RestController when we need to send response in JSON format directly.
By default, @Controller returns a string that indicates which route to redirect. Its used mostly with JSPs. It returns URL to new JSP page where it has to be redirected
They are nothing but the specialized form of @Component annotation for certain situations. Instead of using @Component on a controller class in Spring MVC, we use @Controller, which is more readable and appropriate.
The @Controller is a class-level annotation.
It is a specialization of @Component.
It marks a class as a web request handler. It is often used to serve web pages. It is used in conjunction with @RequestMapping annotation.
We also use @RestController when we need to send response in JSON format directly.
They are nothing but the specialized form of @Component annotation for certain situations. Instead of using @Component on a controller class in Spring MVC, we use @Controller, which is more readable and appropriate.
By using @Controller annotation we do two things,
We declare that this class is a Spring bean and should be created and maintained by Spring ApplicationContext,
We indicate that its a controller in MVC setup. This latter property is used by web-specific tools and functionalities.
DispatcherServlet will look for @RequestMapping on classes that are annotated using @Controller but not with @Component.
This means @Component and @Controller are the same with respect to bean creation and dependency injection but @Controller is a specialized form of @Component. Even if you replace @Controller annotation with @Compoenent, Spring can automatically detect and register the controller class but it may not work as you expect with respect to request mapping.
It is also used at class level.
It is a specialization of @Component.
It tells the Spring that class contains the business logic.
But at the end The main task of this annotation is also to mark the class capable to become a bean in Spring container similar to component. We can use @component also and it will work the same as this annotation does.
Subscriber and Follow Code Decode
#annotations #codedecode #springbootinterviewquestions
0:26:41
Top 10 Spring Annotations to know in 2024
0:19:56
Annotations in Spring boot with Explanation| Spring boot Interview Questions and Answers Code Decode
0:00:55
What is @Qualifier annotation? #java #interview #interviewtips #springboot
0:00:48
What are stereotype annotations in Spring? #java #springboot #interview #interviewtips
0:31:16
Master annotations of Spring Boot | Spring Boot Interview Questions on Annotation | #1
0:00:52
What is Autowiring in Spring? #java #interview #interviewtips #springboot
0:17:54
Annotations in Spring Boot Interview Questions and Answers | Code Decode | Part -2
0:00:51
Component Vs Bean In Spring #javadeveloper #coding #javaframework #springboot
0:10:35
Spring Boot Annotations Interview Questions and Answer | Most Asked Spring Boot Annotation
0:28:12
Spring Boot Annotations Interview Questions Covered
1:01:59
Interview QA | 40+ Spring & Spring Boot Annotations Everyone Should Know | JavaTechie
0:07:39
Difference between @component & @bean annotations in Spring boot | Interview Question | Code Dec...
0:34:58
Spring boot Annotations (Controller Layer) | Controller, RestController, RequestMapping etc.
0:36:56
🔥Top Spring Boot Annotations | Interview Guide in Hindi
0:00:56
What is a Bean in Spring Framework? #java #interview #interviewtips #springboot
0:00:51
Spring Transactions & Transactional Annotation #javaframework #springframework #programming
0:00:59
What is an annotation? - Cracking the Java Coding Interview
0:47:34
Real-Time Spring Boot Interview Questions and Answers [All In One Video]
0:27:33
Top 10 Essential Spring Boot Annotations for Interviews and Real-World Projects
0:10:51
Spring Annotations for Experienced Developers #springboot #java #annotations
0:00:59
Configuration Annotation In Spring✅ #javaprogramming
0:01:00
🔝Top 10 most commonly used Spring Boot annotations #interviewquestions #springboot #annotations
0:22:52
Spring Annotations Explained: Comprehensive Guide with Examples
0:00:35
Qualifier vs Primary in Spring? | Java Interview Question | Spring Boot Annotations #TDShorts 19
Комментарии