Spring beans belonging to packages that are not included in a @ComponentScan
configuration will not be accessible in the Spring
Application Context. Therefore, it’s likely to be a configuration mistake that will be detected by this rule.
Note: the @ComponentScan
is implicit in the @SpringBootApplication
annotation, case in which Spring Boot
will auto scan for components in the package containing the Spring Boot main class and its sub-packages.
package com.mycompany.app; @Configuration @ComponentScan("com.mycompany.app.beans") public class Application { ... } package com.mycompany.app.web; @Controller public class MyController { // Noncompliant; MyController belong to "com.mycompany.app.web" while the ComponentScan is looking for beans in "com.mycompany.app.beans" package ... }
package com.mycompany.app; @Configuration @ComponentScan({"com.mycompany.app.beans","com.mycompany.app.web"}) or @ComponentScan("com.mycompany.app") or @ComponentScan public class Application { ... } package com.mycompany.app.web; @Controller public class MyController { // "com.mycompany.app.web" is referenced by a @ComponentScan annotated class ... }