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Declaring a bean. To declare a bean, simply annotate a method with the @Bean annotation. When JavaConfig encounters such a method, it will execute that method and register the return value as a bean within a BeanFactory .
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 .
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.
scanBasePackages - Takes in a string array and allows wildcard string filtering for package names, thereby allowing entire package directories to be included or scanned. scanbasePackageClasses - Allows specific inclusion of classes provided via an array.
It might be because the project has been broken down into different modules.
@SpringBootApplication
@ComponentScan({"com.delivery.request"})
@EntityScan("com.delivery.domain")
@EnableJpaRepositories("com.delivery.repository")
public class WebServiceApplication extends SpringBootServletInitializer {
There is a chance...
You might be missing @Service, @Repository annotation on your respective implementation classes.
Your Applicant class is not scanned it seems. By default all packages starting with the root as the class where you have put @SpringBootApplication will be scanned.
suppose your main class "WebServiceApplication" is in "com.service.something", then all components that fall under "com.service.something" is scanned, and "com.service.applicant" will not be scanned.
You can either restructure your packages such that "WebServiceApplication" falls under a root package and all other components becomes part of that root package. Or you can include @SpringBootApplication(scanBasePackages={"com.service.something","com.service.application"}) etc such that "ALL" components are scanned and initialized in the spring container.
Update based on comment
If you have multiple modules that are being managed by maven/gradle, all spring needs is the package to scan. You tell spring to scan "com.module1" and you have another module which has its root package name as "com.module2", those components wont be scanned. You can even tell spring to scan "com" which will then scan all components in "com.module1." and "com.module2."
Basically this happens when you have your Class Application in "another package". For example:
com.server
- Applicacion.class (<--this class have @ComponentScan)
com.server.config
- MongoConfig.class
com.server.repository
- UserRepository
I solve the problem with this in the Application.class
@SpringBootApplication
@ComponentScan ({"com.server", "com.server.config"})
@EnableMongoRepositories ("com.server.repository") // this fix the problem
Another less elegant way is to: put all the configuration classes in the same package.
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