java - How to validate if a bean instance has been wired? -

i'm creating small framework provides abstract base classes have implemented when using library.

how can create validation routine checks if indeed classes have been implemented?

i thought maybe use @conditionalonmissingbean of spring-boot, nothing far. anyhow, goal be:

@configuration @enableautoconfiguration public class appcfg {     @conditionalonmissingbean(basecarservice.class) //stupid exmaple     public void validate() {         system.out.println("missing bean!!");     } }  //must implemented public abstract basecarservice {  } 

how can achieve this?

you can calling applicationcontext.getbeansoftype(basecarservice.class) when context has been initialized (for example bean implements contextloaderlistener), i.e. following:

public class beansvalidator impelements contextloaderlistener {     public void contextinitialized(servletcontextevent event) {          if (applicationcontext.getbeansoftype(basecarservice.class).isempty()) {                // print log, throw exception, etc           }     } }