Tag: springboot
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Understanding @RestController in Spring Boot
What is it? This annotation is a specialization of @Controller, specifically designed for creating REST endpoints. It combines the @Controller and @ResponseBody annotations, making it easier to create RESTful applications. If your application works with RESTful APIs, this is the go-to annotation to define your controllers. It simplifies your code and communicates the intent: this…
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How to Use @Controller in Spring
What is? This class-level annotation tells Spring that your class is a controller. A controller is an entry point for a web application. This allows you to define a path to communicate with your backend using REST methods or by serving and responding html forms. This more general annotation allows your controller to serve REST…
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Understanding the @Configuration Annotation in Spring
The @Configuration annotation indicates to Spring that the class has one or more @Bean methods. When starting the application context, Spring will look to these classes to load the Spring IoC container with the beans you define in those methods. It allows you to create custom beans and perform configurations (like when you use Spring…
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Understanding the @Scope Annotation in Spring: How Bean Scopes Work
What is @Scope This is a class-level annotation that allows the developer to define the scope of a Spring bean. By default, all Spring beans are singletons, but by using this annotation, you can modify that to the following scopes: Why is it important: How to use @Scope In every bean that you have, you…
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How to Use @PropertySource in Your Spring Application
What is the @PropertySource annotation? The @PropertySource annotation is used to tell Spring to load a specific properties file from a location provided in the annotation. It is used in conjunction with @Configuration at the class level. It allows you, as a developer, to externalize the configuration of your application. Why use @PropertySource? How to…
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Spring Essentials: How to Use the @Bean Annotation for Custom Services
In our application, we have a lot of objects. These objects are components of our application. When we want Spring to create, manage, and inject these objects, they are considered Spring beans. The @Bean annotation is a method-level annotation that we can use to tell Spring that we want it to manage the instance for…
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How to Use Spring’s @Profile Annotation for Flexible Configurations
The profile annotation in spring allows you to segregate configurations that are available only in specific environments. If you mark a @Component (and its specializations) or any @Configuration or @Bean with the @Profile annotation, they will be available only if the profile specified is active. You can set the profile using application.properties by using the…
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@Resource: The Versatile Bean Injection Annotation for Jakarta EE and Spring
This annotation does bean injection, like the @Autowired and @Inject annotations. This annotation is packaged with Jakarta EE and will work on your Spring projects. You can use this annotation almost in the same way you use the other annotations used to inject dependencies. Using in-field injection and set methods is possible, but constructors are…
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Understanding the @DependsOn Annotation in Spring
Introduction to the @DependsOn Annotation This annotation tells Spring that the bean marked with this annotation should be created after the beans that it depends on are initialized. You can specify the beans you need to be created first in the @DependsOn annotation parameters. This annotation is used when a bean does not explicitly depend…
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Understanding @Primary in Spring
If you read my post about the @Qualifier annotation, you have noticed that defining two beans of the same type can be a challenge. By distinguishing it with a qualifier name, @Qualifier helps Spring determine which bean to inject. The @Primary annotation will help Spring decide which of those same types of beans it should…