Predictable index position for BindingResult keys and parameter annotation convenience methods in MethodParameter

org.springframework.core/src/main/java/org/springframework/core/MethodParameter.java

@@ -278,6 +278,20 @@ public class MethodParameter {
 		return null;
 	}
 
+	/**
+	 * Return true if the parameter has at least one annotation, false if it has none.
+	 */
+	public boolean hasParameterAnnotations() {
+		return getParameterAnnotations().length != 0;
+	}
+
+	/**
+	 * Return true if the parameter has the given annotation type, and false if it doesn't.
+	 */
+	public <T extends Annotation> boolean hasParameterAnnotation(Class<T> annotationType) {
+		return getParameterAnnotation(annotationType) != null;
+	}
+
 	/**
 	 * Initialize parameter name discovery for this method parameter.
 	 * <p>This method does not actually try to retrieve the parameter name at