is used on classes to indicate a Spring component. We can use this annotation with a constructor, setter, or field injection. is used to mark a dependency which Spring is going to resolve and inject automatically. If specific packages are not defined, scanning will occur from the package of the class that declares this annotation. is also used to specify base packages using basePackageClasses or basePackage attributes to scan. is used with annotation to allow Spring to know the packages to scan for annotated components. A Java class annotated with is a configuration by itself and will have methods to instantiate and configure the dependencies. is an analog for an XML configuration file – it is configured using Java classes. Spring Core Annotations is used on classes that define beans. Let’s look at all the annotations provided by the Spring Framework. With Spring Boot, we can do almost everything with annotations. Spring Framework started out with XML configuration and over time it has introduced many capabilities to reduce code verbose and get things done quickly. Nowadays, there are so many spring annotations that it could become overwhelming. Note that we limited our list to the 4 points above since the annotations we'll discuss next apply primarily to these areas. Spring Boot provides annotations that make these (and many, MANY other) functionalities very easy for developers to implement without having to worry about most of the technical details of the webserver, database, or arbitrary service in use. Fetching data from and writing data to a database table.
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