How to get a method's annotation value from a ProceedingJoinPoint?

Question

I have below annotation.

MyAnnotation.java

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface MyAnnotation {

}
         


        

Answer 1

René's example is taking me a long way. Also the explanation how I get ClassLevel Annotations.

But then I can only read ClassLevel Annotations Values if I have previously used a method annotation with "*@Around("execution(public * (..)) && @annotation(com.mycompany.MyAnnotation)")""

How can I get around this? How can I trigger an Aspect if a ClassLevel Annotation is set without going through a Method Execution?

I want to write a ClassLevel Annotation like

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(value = { ElementType.METHOD, ElementType.TYPE })
@EnableSwagger2
@Import(SwaggerConfiguration.class)
public @interface EnableSwaggerApi {
    String controllerPackage() default "foo.bar.ctrl";
}

It's importing the Configuration about "SwaggerConfiguration" where I want to receive the value of "controllerPackage"

@Aspect
public class SwaggerConfiguration {

    @Value("${tom.swagger.controller.package:foo.bar.notset}")
    private String  controllerPackage;

    @Value("${tom.swagger.api.version:1.0.0}")
    private String  apiVersion;

    @Value("${spring.application.name:MyApplication}")
    private String  applicationName;

    @Around("execution(public * *(..)) && @annotation(EnableSwaggerApi)")
    public void procede(ProceedingJoinPoint call) throws Throwable {
        MethodSignature signature = (MethodSignature) call.getSignature();
        Method method = signature.getMethod();

        Class declaringClass = method.getDeclaringClass();
        EnableSwaggerApi myAnnotation = declaringClass.getAnnotation(EnableSwaggerApi.class);
        System.err.println("1 -> " + myAnnotation.controllerPackage());  // -> tko.backend.spring.ctrl

        myAnnotation = method.getAnnotation(EnableSwaggerApi.class);
        System.err.println("2 -> " + myAnnotation.controllerPackage()); // -> tko.backend.spring.SOMEOTHERSTUFF


        // THIS WORKS, BUT JUST IF I USE THE @EnableSwaggerApi ON SOME METHOD!
        // NOT ON CLASS

    }

    @Bean
    public Docket swaggerApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .select()
                .apis(RequestHandlerSelectors.basePackage("controllerPackage"))
                .paths(PathSelectors.any())
                .build()
                .apiInfo(new ApiInfoBuilder().version(apiVersion).title(applicationName).description("Documentation " + applicationName + " API v" + apiVersion)
                        .build());
    }

    @Bean
    public CorsFilter corsFilter() {
        final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        final CorsConfiguration config = new CorsConfiguration();
        config.setAllowCredentials(true);
        config.addAllowedOrigin("*");
        config.addAllowedHeader("*");
        config.addAllowedMethod("*");
        source.registerCorsConfiguration("/v2/api-docs", config);
        return new CorsFilter(source);
    }
}





@EnableSwaggerApi(controllerPackage="tko.backend.spring.ctrl")
public class Application extends SpringBootServletInitializer {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class, Initializer.class);
    }


    @Bean
    @EnableSwaggerApi(controllerPackage="tko.backend.spring.SOMEOTHERSTUFF")
    public String initSwagger() {
        return "some dummy";
    }

}

How can I can rid of the annotation on initSwagger()? Since the Application.class is not known to SwaggerConfiguration (Swagger Stuff it's in a separate lib) I can't use simple reflection like

Application.class.getAnnotation(EnableSwaggerApi.class)