检查项目中的所有类是否都有特定的注释

Question

My current situation: I want to write a test that checks, if all my files with "Service" in the name have the "@Valid" Annotation. I tried researching it but could not find anything.

Answer 1

The Java Reflection API can be used to check the annotations of a class.

Eg the following code prints the name and value of each class annotation of type MyAnnotation .

Class aClass = TheClass.class;
Annotation[] annotations = aClass.getAnnotations();

for(Annotation annotation : annotations){
    if(annotation instanceof MyAnnotation){
        MyAnnotation myAnnotation = (MyAnnotation) annotation;
        System.out.println("name: " + myAnnotation.name());
        System.out.println("value: " + myAnnotation.value());
    }
}

source

The comment by Lino shows how to find all classes in the current classpath.