Tag: programming
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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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How to Use the @Import Annotation in Spring Framework
The @Import annotation allows you to specify which configurations your Spring application should load. You can think of this annotation as your Java class’s import statements. In this case, it’s going to import only classes with the @Configuration annotation. It’s not the exact concept, but you get the idea. By using the @Import, you explicitly…
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Method security with @Secured Annotation in Spring
This annotation provides a way to add security configuration to business methods. It will use roles to check if a user has permission to call this method. The annotation is part of spring security. So to enable its usage you need the spring security dependency. Example Scenario You have an application that has a product…
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Using the @Lookup Annotation in Spring
The @Lookup annotation is an injection (like @Inject, @Resource, @Autowired) annotation used at the method level. This annotation tells Spring to overwrite the method, redirecting to the bean factory to return a bean matching the return type of the method. This can be useful for some bean scopes, such as the prototype scope, which will…