Add more empty array constants in ReflectionUtils

Add some additional empty array constants to `ReflectionUtils` to save
us creating new arrays for zero length results.

See gh-22567

Author: philwebb

spring-core/src/main/java/org/springframework/util/ReflectionUtils.java

@@ -66,10 +66,14 @@ public abstract class ReflectionUtils {
 	 */
 	private static final String CGLIB_RENAMED_METHOD_PREFIX = "CGLIB$";
 
+	private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
+
 	private static final Method[] EMPTY_METHOD_ARRAY = new Method[0];
 
 	private static final Field[] EMPTY_FIELD_ARRAY = new Field[0];
 
+	private static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
+
 
 	/**
 	 * Cache for {@link Class#getDeclaredMethods()} plus equivalent default methods
@@ -211,7 +215,7 @@ public static void makeAccessible(Constructor<?> ctor) {
 	 */
 	@Nullable
 	public static Method findMethod(Class<?> clazz, String name) {
-		return findMethod(clazz, name, new Class<?>[0]);
+		return findMethod(clazz, name, EMPTY_CLASS_ARRAY);
 	}
 
 	/**
@@ -255,7 +259,7 @@ public static Method findMethod(Class<?> clazz, String name, @Nullable Class<?>.
 	 */
 	@Nullable
 	public static Object invokeMethod(Method method, @Nullable Object target) {
-		return invokeMethod(method, target, new Object[0]);
+		return invokeMethod(method, target, EMPTY_OBJECT_ARRAY);
 	}
 
 	/**