Refine spring-aop arguments nullness

See spring-projectsgh-28797

Author: sdeleuze

spring-aop/src/main/java/org/springframework/aop/ProxyMethodInvocation.java

@@ -58,14 +58,14 @@ public interface ProxyMethodInvocation extends MethodInvocation {
 	 * @return an invocable clone of this invocation.
 	 * {@code proceed()} can be called once per clone.
 	 */
-	MethodInvocation invocableClone(Object... arguments);
+	MethodInvocation invocableClone(@Nullable Object... arguments);
 
 	/**
 	 * Set the arguments to be used on subsequent invocations in the any advice
 	 * in this chain.
 	 * @param arguments the argument array
 	 */
-	void setArguments(Object... arguments);
+	void setArguments(@Nullable Object... arguments);
 
 	/**
 	 * Add the specified user attribute with the given value to this invocation.

spring-aop/src/main/java/org/springframework/aop/framework/AopProxyUtils.java

@@ -253,7 +253,7 @@ public static boolean equalsAdvisors(AdvisedSupport a, AdvisedSupport b) {
 	 * @return a cloned argument array, or the original if no adaptation is needed
 	 * @since 4.2.3
 	 */
-	static Object[] adaptArgumentsIfNecessary(Method method, Object @Nullable [] arguments) {
+	static @Nullable Object[] adaptArgumentsIfNecessary(Method method, @Nullable Object[] arguments) {
 		if (ObjectUtils.isEmpty(arguments)) {
 			return new Object[0];
 		}

spring-aop/src/main/java/org/springframework/aop/framework/ReflectiveMethodInvocation.java

@@ -67,7 +67,7 @@ public class ReflectiveMethodInvocation implements ProxyMethodInvocation, Clonea
 
 	protected final Method method;
 
-	protected Object[] arguments;
+	protected @Nullable Object[] arguments;
 
 	private final @Nullable Class<?> targetClass;
 
@@ -103,7 +103,7 @@ public class ReflectiveMethodInvocation implements ProxyMethodInvocation, Clonea
 	 * but would complicate the code. And it would work only for static pointcuts.
 	 */
 	protected ReflectiveMethodInvocation(
-			Object proxy, @Nullable Object target, Method method, Object @Nullable [] arguments,
+			Object proxy, @Nullable Object target, Method method, @Nullable Object[] arguments,
 			@Nullable Class<?> targetClass, List<Object> interceptorsAndDynamicMethodMatchers) {
 
 		this.proxy = proxy;
@@ -141,12 +141,13 @@ public final Method getMethod() {
 	}
 
 	@Override
-	public final Object[] getArguments() {
+	public final @Nullable Object[] getArguments() {
 		return this.arguments;
 	}
 
 	@Override
-	public void setArguments(Object... arguments) {
+	@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1113
+	public void setArguments(@Nullable Object... arguments) {
 		this.arguments = arguments;
 	}
 
@@ -218,7 +219,8 @@ public MethodInvocation invocableClone() {
 	 * @see java.lang.Object#clone()
 	 */
 	@Override
-	public MethodInvocation invocableClone(Object... arguments) {
+	@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1113
+	public MethodInvocation invocableClone(@Nullable Object... arguments) {
 		// Force initialization of the user attributes Map,
 		// for having a shared Map reference in the clone.
 		if (this.userAttributes == null) {

spring-aop/src/main/java/org/springframework/aop/support/AopUtils.java

@@ -347,7 +347,7 @@ public static List<Advisor> findAdvisorsThatCanApply(List<Advisor> candidateAdvi
 	 * @throws Throwable if thrown by the target method
 	 * @throws org.springframework.aop.AopInvocationException in case of a reflection error
 	 */
-	public static @Nullable Object invokeJoinpointUsingReflection(@Nullable Object target, Method method, Object[] args)
+	public static @Nullable Object invokeJoinpointUsingReflection(@Nullable Object target, Method method, @Nullable Object[] args)
 			throws Throwable {
 
 		// Use reflection to invoke the method.
@@ -377,7 +377,7 @@ public static List<Advisor> findAdvisorsThatCanApply(List<Advisor> candidateAdvi
 	 */
 	private static class KotlinDelegate {
 
-		public static Object invokeSuspendingFunction(Method method, @Nullable Object target, Object... args) {
+		public static Object invokeSuspendingFunction(Method method, @Nullable Object target, @Nullable Object... args) {
 			Continuation<?> continuation = (Continuation<?>) args[args.length -1];
 			Assert.state(continuation != null, "No Continuation available");
 			CoroutineContext context = continuation.getContext().minusKey(Job.Key);