How to read custom annotation value using reflection? - reflection

Question

I am trying to read custom annotation value using reflection.
I see the custom annotation in debug but when i try to typecast annotation to my custom annotation, I am getting ClassCastException.
What am I doing wrong?
//custom annotation
#Retention(Retention.RUNTIME)
#Target({ElementType.METHOD})
public #interface SendEmail{
public String id;
}
//method annotated with custom annotation
#SendEmail(id="test#test.com")
public void testEmail(){
}
// extracting custom annotation using reflection
Set<Method> annotatedMethods = reflections.getMethodsAnnotatedWith(SendEmail.class);
for(Methods method : annotatedMethods){
Annotations[] annotations = method.getDeclaredAnnotations();
SendEmail sendEmail = method.getAnnotation(SendEmail.class); // returns null;
for(Annotation annotation : annotations){
annotation.annotationType.getName(); // com.test.email.annotation.SendEmail
annotation.toString(); // #com.test.email.annotation.SendEmail(id=test#test.com)
SendEmail sendEmail = (SendEmail) annotation; // ClassCastException com.sun.proxy.$Proxy24 cannot be cast to com.test.email.annotation.SendEmail
if(annotation.annotationType.getName() == SendEmail.class.getName()){
SendEmail sendEmail = (SendEmail) annotation; // ClassCastException com.sun.proxy.$Proxy24 cannot be cast to com.test.email.annotation.SendEmail
}
}

Answer 1

Can read custom annotation value using java reflection as described in below code.
public class ValidatorClassName implements ConstraintValidator<RemarkValid, Object> {
private String remark;
private String enable;
#Override
public void initialize(RemarkValid constraintAnnotation) {
enable = constraintAnnotation.enable();
remark = constraintAnnotation.remark();
}
#Override
public boolean isValid(Object objectToValidate, ConstraintValidatorContext context) {
String remarkFieldValue;
Boolean enableFieldValue;
try {
context.disableDefaultConstraintViolation();
remarkFieldValue = (String) getFieldValue(objectToValidate, remark);
enableFieldValue = (Boolean) getFieldValue(objectToValidate, enable);
/*logic*/
} catch (Exception e) {
log.error(e.getLocalizedMessage());
}
return true;
}
private Object getFieldValue(Object object, String remark) throws Exception {
Field field = object.getClass().getDeclaredField(remark);
field.setAccessible(true);
return field.get(object);
}
}
As well as can create a BeanWrapperImpl for the given object to read bean property value as below,
BeanWrapper objectToValidateBean = new BeanWrapperImpl(objectToValidate);
Object actualValue = objectToValidateBean.getPropertyValue(remark);