Modify a class definition's annotation string parameter at runtime

Question

Imagine there is a class:

@Something(someProperty = \"some value\")
public class Foobar {
    //...
}

Which is already compiled (I cannot c

Answer 1

i am able to access and modify annotaions in this way in jdk1.8,but not sure why has no effect,

try {
    Field annotationDataField = myObject.getClass().getClass().getDeclaredField("annotationData");
    annotationDataField.setAccessible(true);
    Field annotationsField = annotationDataField.get(myObject.getClass()).getClass().getDeclaredField("annotations");
    annotationsField.setAccessible(true);
    Map, Annotation> annotations =  (Map, Annotation>) annotationsField.get(annotationDataField.get(myObject.getClass()));
    annotations.put(Something.class, newSomethingValue);
} catch (IllegalArgumentException | IllegalAccessException e) {
    e.printStackTrace();
} catch (NoSuchFieldException e) {
    e.printStackTrace();
} catch (SecurityException e) {    
    e.printStackTrace();
}