Allow AutoCloseable dereferences on original AutoCloseable beans

Closes gh-29480

Author: jhoeller

spring-beans/src/main/java/org/springframework/beans/CachedIntrospectionResults.java

@@ -295,7 +295,7 @@ private CachedIntrospectionResults(Class<?> beanClass) throws BeansException {
 					// Only allow URL attribute introspection, not content resolution
 					continue;
 				}
-				if (pd.getWriteMethod() == null && isInvalidReadOnlyPropertyType(pd.getPropertyType())) {
+				if (pd.getWriteMethod() == null && isInvalidReadOnlyPropertyType(pd.getPropertyType(), beanClass)) {
 					// Ignore read-only properties such as ClassLoader - no need to bind to those
 					continue;
 				}
@@ -345,7 +345,8 @@ private void introspectInterfaces(Class<?> beanClass, Class<?> currClass, Set<St
 						// GenericTypeAwarePropertyDescriptor leniently resolves a set* write method
 						// against a declared read method, so we prefer read method descriptors here.
 						pd = buildGenericTypeAwarePropertyDescriptor(beanClass, pd);
-						if (pd.getWriteMethod() == null && isInvalidReadOnlyPropertyType(pd.getPropertyType())) {
+						if (pd.getWriteMethod() == null &&
+								isInvalidReadOnlyPropertyType(pd.getPropertyType(), beanClass)) {
 							// Ignore read-only properties such as ClassLoader - no need to bind to those
 							continue;
 						}
@@ -378,7 +379,7 @@ private boolean isPlainAccessor(Method method) {
 		if (Modifier.isStatic(method.getModifiers()) ||
 				method.getDeclaringClass() == Object.class || method.getDeclaringClass() == Class.class ||
 				method.getParameterCount() > 0 || method.getReturnType() == void.class ||
-				isInvalidReadOnlyPropertyType(method.getReturnType())) {
+				isInvalidReadOnlyPropertyType(method.getReturnType(), method.getDeclaringClass())) {
 			return false;
 		}
 		try {
@@ -391,10 +392,11 @@ private boolean isPlainAccessor(Method method) {
 		}
 	}
 
-	private boolean isInvalidReadOnlyPropertyType(@Nullable Class<?> returnType) {
-		return (returnType != null && (AutoCloseable.class.isAssignableFrom(returnType) ||
-				ClassLoader.class.isAssignableFrom(returnType) ||
-				ProtectionDomain.class.isAssignableFrom(returnType)));
+	private boolean isInvalidReadOnlyPropertyType(@Nullable Class<?> returnType, Class<?> beanClass) {
+		return (returnType != null && (ClassLoader.class.isAssignableFrom(returnType) ||
+				ProtectionDomain.class.isAssignableFrom(returnType) ||
+				(AutoCloseable.class.isAssignableFrom(returnType) &&
+						!AutoCloseable.class.isAssignableFrom(beanClass))));
 	}
 
 

spring-beans/src/test/java/org/springframework/beans/BeanWrapperTests.java

@@ -216,6 +216,10 @@ void propertyDescriptors() throws Exception {
 		assertThat(accessor.isReadableProperty("inputStream")).isFalse();
 		assertThat(accessor.isReadableProperty("filename")).isTrue();
 		assertThat(accessor.isReadableProperty("description")).isTrue();
+
+		accessor = createAccessor(new ActiveResource());
+
+		assertThat(accessor.isReadableProperty("resource")).isTrue();
 	}
 
 	@Test
@@ -376,6 +380,18 @@ public String getObject() {
 	}
 
 
+	public static class ActiveResource implements AutoCloseable {
+
+		public ActiveResource getResource() {
+			return this;
+		}
+
+		@Override
+		public void close() throws Exception {
+		}
+	}
+
+
 	public static class GetterWithOptional {
 
 		public TestBean value;