如何让java方法注释在scala中工作

Question

I've got two projects, a scala project and a java project. My scala project references the java project in the build path. In my java project, i'm declaring the following annotation:

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface MyAnnotation {
    public String Name();
}

In my scala project, I'm annotating some methods. Ie

class MyClass {
    ...
    @MyAnnotation(Name="Blah")
    def myMethod() {
        ...
    }
}

In another file somewhere, i'm trying to pull out the annotations.

var methods = myClassInstance.getClass().getDeclaredMethods()
var myMethod : Method = null
for (method <- methods) {
  if (method.getName().equals("myMethod")) {
    myMethod = method
  }
}
var annotations = myMethod.getDeclaredAnnotations()

Unfortunately, annotations is always an empty array. Am I doing something fundamentally wrong or am I just missing something minor? Thanks!

EDIT Originally, I was annotating myMethod with myAnnotation twice, which is incorrect as someone pointed out. It turns out this wasn't the problem. I'm still getting an empty array for annotations . No exception is being thrown.

Answer 1

I tried your code, the problem is that your use @MyAnnotation twice for myMethod, which should raise AnnotationFormatError: Duplicate annotation for class

When i change to use it once, the reflection just retrieves the annotions.