Java Community | Help. Code. Learn.•2mo ago

Get method name within an annotation dinamically

Hi guys, is possible to get the method name from which a custom annotation is being called? E.x.

@MyCustomAnnotation
public void myMethod(){}

@MyCustomAnnotation
public void myMethod(){}

From the aspect processing MyCustomAnnotation, it's possible to get to know that the method "annotated" it's myMethod ? Thanks ! Edit: The idea is not having to depend in a custom attribute where the method name would be hardcoded

13 Replies

JavaBot•2mo ago

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Hey @keplerk! Please use /close or the Close Post button above when your problem is solved. Please remember to follow the help guidelines. This post will be automatically closed after 300 minutes of inactivity.

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dan1st•2mo ago

yes you can use reflection for it first get the Method object (using Class#getMethod or similar) and then you can use getAnnotation on it to get the annotation and use the returned object to access the attributes btw you can use interfaces to enforce the method existing

keplerkOP•2mo ago

The problem is that there are several methods in that class, i've even tried with getEnclosingMethod I've tried several options, so as a last resort i posted my question here

dan1st•2mo ago

you can get a method by its signature YourClass.class.getMethod("myMethod"/*, YourParametersHere.class*/) or objectOfYourClass.getClass().getMethod("myMethod"/*, YourParametersHere.class*/)

keplerkOP•2mo ago

Yeah, but the point is that i want to avoid having to use the method name in a "hardcoded" way, i have it working that way right now, but my goal is to make it work in a "dynamic" way.

dan1st•2mo ago

oh I didn't read the "not" in your edit You can use Class#getMethods() to get all methods of a class and then find the annotated method

Class<?> cl = yourObject.getClass();
for(Method method : cl.getMethods()){
  MyCustomAnnotation annotation = method.getAnnotation(MyCustomAnnotation.class);
  if(annotation != null) {
    //...
  }
}

Class<?> cl = yourObject.getClass();
for(Method method : cl.getMethods()){
  MyCustomAnnotation annotation = method.getAnnotation(MyCustomAnnotation.class);
  if(annotation != null) {
    //...
  }
}

keplerkOP•2mo ago

The problem is that the custom annotation will be used across all methods with a requestmapping on it :Sad: So is not a single usage I've squeezed my brain, and the only solution i can think about it's basically what i don't want to do

dan1st•2mo ago

You can get all spring managed components and look for methods with the annotation

keplerkOP•2mo ago

Yeah but my need is for the Method where the annotation is executing at that moment Looks like there is no other option but hardcode the method name as an attribute of the annotation

@MyCustomAnnotation(methodName = "myMethod")
public void myMethod(){}

@MyCustomAnnotation(methodName = "myMethod")
public void myMethod(){}

dan1st•2mo ago

ApplicationContext ctx;//TODO get it from Spring via DI or similar
Collection<Object> controllers = ctx.getBeansWithAnnotation(Controller.class);//if you just want controllers
for(Object controller : controllers){
  Class<?> cl = yourObject.getClass();
  for(Method method : cl.getMethods()){
    MyCustomAnnotation annotation = method.getAnnotation(MyCustomAnnotation.class);
    if(annotation != null) {
      //...
    }
  }
}

ApplicationContext ctx;//TODO get it from Spring via DI or similar
Collection<Object> controllers = ctx.getBeansWithAnnotation(Controller.class);//if you just want controllers
for(Object controller : controllers){
  Class<?> cl = yourObject.getClass();
  for(Method method : cl.getMethods()){
    MyCustomAnnotation annotation = method.getAnnotation(MyCustomAnnotation.class);
    if(annotation != null) {
      //...
    }
  }
}

keplerkOP•2mo ago

Is not that complicated, due all the logic being inside an aspect with aop Inside it i have access to the class, so no application context necessary

joinPoint.getTarget().getClass().getMethods()

joinPoint.getTarget().getClass().getMethods()

There is no proper solution so, i'll close this post, i'll go for the one i wanted to avoid the most explained on the edit on my original post.

JavaBot•2mo ago

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JavaBot•2mo ago

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Get method name within an annotation dinamically