Support for @ControllerAdvice in WebFlux

Issue: SPR-15132

spring-test/src/main/java/org/springframework/test/web/reactive/server/DefaultControllerSpec.java

@@ -15,6 +15,7 @@
  */
 package org.springframework.test.web.reactive.server;
 
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Optional;
@@ -44,6 +45,8 @@ class DefaultControllerSpec implements WebTestClient.ControllerSpec {
 
 	private final List<Object> controllers;
 
+	private final List<Object> controllerAdvice = new ArrayList<>(8);
+
 	private final TestWebFluxConfigurer configurer = new TestWebFluxConfigurer();
 
 
@@ -53,6 +56,12 @@ class DefaultControllerSpec implements WebTestClient.ControllerSpec {
 	}
 
 
+	@Override
+	public DefaultControllerSpec controllerAdvice(Object... controllerAdvice) {
+		this.controllerAdvice.addAll(Arrays.asList(controllerAdvice));
+		return this;
+	}
+
 	@Override
 	public DefaultControllerSpec contentTypeResolver(Consumer<RequestedContentTypeResolverBuilder> consumer) {
 		this.configurer.contentTypeResolverConsumer = consumer;
@@ -103,12 +112,17 @@ class DefaultControllerSpec implements WebTestClient.ControllerSpec {
 
 	@Override
 	public WebTestClient.Builder configureClient() {
+		return WebTestClient.bindToApplicationContext(createApplicationContext());
+	}
+
+	protected AnnotationConfigApplicationContext createApplicationContext() {
 		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
 		this.controllers.forEach(controller -> registerBean(context, controller));
+		this.controllerAdvice.forEach(advice -> registerBean(context, advice));
 		context.register(DelegatingWebFluxConfiguration.class);
 		context.registerBean(WebFluxConfigurer.class, () -> this.configurer);
 		context.refresh();
-		return WebTestClient.bindToApplicationContext(context);
+		return context;
 	}
 
 	@SuppressWarnings("unchecked")

spring-test/src/main/java/org/springframework/test/web/reactive/server/WebTestClient.java

@@ -179,6 +179,13 @@ public interface WebTestClient {
 	 */
 	interface ControllerSpec {
 
+		/**
+		 * Register one or more
+		 * {@link org.springframework.web.bind.annotation.ControllerAdvice
+		 * ControllerAdvice} instances to be used in tests.
+		 */
+		ControllerSpec controllerAdvice(Object... controllerAdvice);
+
 		/**
 		 * Customize content type resolution.
 		 * @see WebFluxConfigurer#configureContentTypeResolver

spring-test/src/test/java/org/springframework/test/web/reactive/server/DefaultControllerSpecTests.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2002-2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.test.web.reactive.server;
+
+import org.junit.Test;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+import static org.junit.Assert.assertSame;
+
+/**
+ * Unit tests for {@link DefaultControllerSpec}.
+ * @author Rossen Stoyanchev
+ */
+public class DefaultControllerSpecTests {
+
+	@Test
+	public void controllers() throws Exception {
+		OneController controller1 = new OneController();
+		SecondController controller2 = new SecondController();
+
+		TestControllerSpec spec = new TestControllerSpec(controller1, controller2);
+		ApplicationContext context = spec.createApplicationContext();
+
+		assertSame(controller1, context.getBean(OneController.class));
+		assertSame(controller2, context.getBean(SecondController.class));
+	}
+
+	@Test
+	public void controllerAdvice() throws Exception {
+		OneControllerAdvice advice = new OneControllerAdvice();
+
+		TestControllerSpec spec = new TestControllerSpec(new OneController());
+		spec.controllerAdvice(advice);
+		ApplicationContext context = spec.createApplicationContext();
+
+		assertSame(advice, context.getBean(OneControllerAdvice.class));
+	}
+
+	private static class OneController {}
+
+	private static class SecondController {}
+
+	private static class OneControllerAdvice {}
+
+
+	private static class TestControllerSpec extends DefaultControllerSpec {
+
+		TestControllerSpec(Object... controllers) {
+			super(controllers);
+		}
+
+		@Override
+		public AnnotationConfigApplicationContext createApplicationContext() {
+			return super.createApplicationContext();
+		}
+	}
+
+}

spring-web/src/main/java/org/springframework/web/method/annotation/ExceptionHandlerMethodResolver.java

@@ -125,6 +125,17 @@ public class ExceptionHandlerMethodResolver {
 	 * @return a Method to handle the exception, or {@code null} if none found
 	 */
 	public Method resolveMethod(Exception exception) {
+		return resolveMethod(exception);
+	}
+
+	/**
+	 * Find a {@link Method} to handle the given Throwable.
+	 * Use {@link ExceptionDepthComparator} if more than one match is found.
+	 * @param exception the exception
+	 * @return a Method to handle the exception, or {@code null} if none found
+	 * @since 5.0
+	 */
+	public Method resolveMethodByThrowable(Throwable exception) {
 		Method method = resolveMethodByExceptionType(exception.getClass());
 		if (method == null) {
 			Throwable cause = exception.getCause();

spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/RequestMappingHandlerAdapter.java

@@ -18,24 +18,26 @@ package org.springframework.web.reactive.result.method.annotation;
 
 import java.lang.reflect.Method;
 import java.util.ArrayList;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.function.Function;
-import java.util.stream.Collectors;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import reactor.core.publisher.Mono;
 
-import org.springframework.beans.BeansException;
-import org.springframework.beans.factory.BeanFactory;
-import org.springframework.beans.factory.BeanFactoryAware;
 import org.springframework.beans.factory.InitializingBean;
 import org.springframework.beans.factory.config.ConfigurableBeanFactory;
-import org.springframework.core.MethodIntrospector;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
+import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.core.ReactiveAdapterRegistry;
+import org.springframework.core.annotation.AnnotationAwareOrderComparator;
 import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.core.codec.ByteArrayDecoder;
 import org.springframework.core.codec.ByteBufferDecoder;
@@ -43,11 +45,13 @@ import org.springframework.core.codec.DataBufferDecoder;
 import org.springframework.core.codec.StringDecoder;
 import org.springframework.http.codec.DecoderHttpMessageReader;
 import org.springframework.http.codec.HttpMessageReader;
+import org.springframework.util.Assert;
 import org.springframework.util.ReflectionUtils;
 import org.springframework.web.bind.annotation.InitBinder;
 import org.springframework.web.bind.annotation.ModelAttribute;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.support.WebBindingInitializer;
+import org.springframework.web.method.ControllerAdviceBean;
 import org.springframework.web.method.HandlerMethod;
 import org.springframework.web.method.annotation.ExceptionHandlerMethodResolver;
 import org.springframework.web.reactive.BindingContext;
@@ -59,13 +63,15 @@ import org.springframework.web.reactive.result.method.SyncHandlerMethodArgumentR
 import org.springframework.web.reactive.result.method.SyncInvocableHandlerMethod;
 import org.springframework.web.server.ServerWebExchange;
 
+import static org.springframework.core.MethodIntrospector.selectMethods;
+
 /**
  * Supports the invocation of {@code @RequestMapping} methods.
  *
  * @author Rossen Stoyanchev
  * @since 5.0
  */
-public class RequestMappingHandlerAdapter implements HandlerAdapter, BeanFactoryAware, InitializingBean {
+public class RequestMappingHandlerAdapter implements HandlerAdapter, ApplicationContextAware, InitializingBean {
 
 	private static final Log logger = LogFactory.getLog(RequestMappingHandlerAdapter.class);
 
@@ -84,11 +90,9 @@ public class RequestMappingHandlerAdapter implements HandlerAdapter, BeanFactory
 
 	private List<SyncHandlerMethodArgumentResolver> initBinderArgumentResolvers;
 
-	private ConfigurableBeanFactory beanFactory;
+	private ConfigurableApplicationContext applicationContext;
 
 
-	private ModelInitializer modelInitializer;
-
 	private final Map<Class<?>, Set<Method>> binderMethodCache = new ConcurrentHashMap<>(64);
 
 	private final Map<Class<?>, Set<Method>> attributeMethodCache = new ConcurrentHashMap<>(64);
@@ -97,6 +101,18 @@ public class RequestMappingHandlerAdapter implements HandlerAdapter, BeanFactory
 			new ConcurrentHashMap<>(64);
 
 
+	private final Map<ControllerAdviceBean, Set<Method>> binderAdviceCache = new LinkedHashMap<>(64);
+
+	private final Map<ControllerAdviceBean, Set<Method>> attributeAdviceCache = new LinkedHashMap<>(64);
+
+	private final Map<ControllerAdviceBean, ExceptionHandlerMethodResolver> exceptionHandlerAdviceCache =
+			new LinkedHashMap<>(64);
+
+
+	private ModelInitializer modelInitializer;
+
+
+
 	public RequestMappingHandlerAdapter() {
 		this.messageReaders.add(new DecoderHttpMessageReader<>(new ByteArrayDecoder()));
 		this.messageReaders.add(new DecoderHttpMessageReader<>(new ByteBufferDecoder()));
@@ -204,25 +220,30 @@ public class RequestMappingHandlerAdapter implements HandlerAdapter, BeanFactory
 		return this.initBinderArgumentResolvers;
 	}
 
-
 	/**
-	 * A {@link ConfigurableBeanFactory} is expected for resolving expressions
-	 * in method argument default values.
+	 * A {@link ConfigurableApplicationContext} is expected for resolving
+	 * expressions in method argument default values as well as for
+	 * detecting {@code @ControllerAdvice} beans.
 	 */
 	@Override
-	public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
-		if (beanFactory instanceof ConfigurableBeanFactory) {
-			this.beanFactory = (ConfigurableBeanFactory) beanFactory;
+	public void setApplicationContext(ApplicationContext applicationContext) {
+		if (applicationContext instanceof ConfigurableApplicationContext) {
+			this.applicationContext = (ConfigurableApplicationContext) applicationContext;
 		}
 	}
 
+	public ConfigurableApplicationContext getApplicationContext() {
+		return this.applicationContext;
+	}
+
 	public ConfigurableBeanFactory getBeanFactory() {
-		return this.beanFactory;
+		return this.applicationContext.getBeanFactory();
 	}
 
 
 	@Override
 	public void afterPropertiesSet() throws Exception {
+		initControllerAdviceCache();
 		if (this.argumentResolvers == null) {
 			this.argumentResolvers = getDefaultArgumentResolvers();
 		}
@@ -232,6 +253,43 @@ public class RequestMappingHandlerAdapter implements HandlerAdapter, BeanFactory
 		this.modelInitializer = new ModelInitializer(getReactiveAdapterRegistry());
 	}
 
+	private void initControllerAdviceCache() {
+		if (getApplicationContext() == null) {
+			return;
+		}
+		if (logger.isInfoEnabled()) {
+			logger.info("Looking for @ControllerAdvice: " + getApplicationContext());
+		}
+
+		List<ControllerAdviceBean> beans = ControllerAdviceBean.findAnnotatedBeans(getApplicationContext());
+		AnnotationAwareOrderComparator.sort(beans);
+
+		for (ControllerAdviceBean bean : beans) {
+			Class<?> beanType = bean.getBeanType();
+			Set<Method> attrMethods = selectMethods(beanType, ATTRIBUTE_METHODS);
+			if (!attrMethods.isEmpty()) {
+				this.attributeAdviceCache.put(bean, attrMethods);
+				if (logger.isInfoEnabled()) {
+					logger.info("Detected @ModelAttribute methods in " + bean);
+				}
+			}
+			Set<Method> binderMethods = selectMethods(beanType, BINDER_METHODS);
+			if (!binderMethods.isEmpty()) {
+				this.binderAdviceCache.put(bean, binderMethods);
+				if (logger.isInfoEnabled()) {
+					logger.info("Detected @InitBinder methods in " + bean);
+				}
+			}
+			ExceptionHandlerMethodResolver resolver = new ExceptionHandlerMethodResolver(beanType);
+			if (resolver.hasExceptionMappings()) {
+				this.exceptionHandlerAdviceCache.put(bean, resolver);
+				if (logger.isInfoEnabled()) {
+					logger.info("Detected @ExceptionHandler methods in " + bean);
+				}
+			}
+		}
+	}
+
 	protected List<HandlerMethodArgumentResolver> getDefaultArgumentResolvers() {
 		List<HandlerMethodArgumentResolver> resolvers = new ArrayList<>();
 
@@ -305,80 +363,97 @@ public class RequestMappingHandlerAdapter implements HandlerAdapter, BeanFactory
 	@Override
 	public Mono<HandlerResult> handle(ServerWebExchange exchange, Object handler) {
 
+		Assert.notNull(handler, "Expected handler");
 		HandlerMethod handlerMethod = (HandlerMethod) handler;
 
 		BindingContext bindingContext = new InitBinderBindingContext(
 				getWebBindingInitializer(), getBinderMethods(handlerMethod));
 
-		Mono<Void> modelCompletion = this.modelInitializer.initModel(
-				bindingContext, getAttributeMethods(handlerMethod), exchange);
+		return this.modelInitializer
+				.initModel(bindingContext, getAttributeMethods(handlerMethod), exchange)
+				.then(() -> {
+					Function<Throwable, Mono<HandlerResult>> exceptionHandler =
+							ex -> handleException(exchange, handlerMethod, bindingContext, ex);
 
-		Function<Throwable, Mono<HandlerResult>> exceptionHandler =
-				ex -> handleException(ex, handlerMethod, bindingContext, exchange);
+					InvocableHandlerMethod invocable = new InvocableHandlerMethod(handlerMethod);
+					invocable.setArgumentResolvers(getArgumentResolvers());
 
-		return modelCompletion.then(() -> {
-
-			InvocableHandlerMethod invocable = new InvocableHandlerMethod(handlerMethod);
-			invocable.setArgumentResolvers(getArgumentResolvers());
-
-			return invocable.invoke(exchange, bindingContext)
-					.doOnNext(result -> result.setExceptionHandler(exceptionHandler))
-					.otherwise(exceptionHandler);
-		});
+					return invocable.invoke(exchange, bindingContext)
+							.doOnNext(result -> result.setExceptionHandler(exceptionHandler))
+							.otherwise(exceptionHandler);
+				});
 	}
 
 	private List<SyncInvocableHandlerMethod> getBinderMethods(HandlerMethod handlerMethod) {
 
+		List<SyncInvocableHandlerMethod> result = new ArrayList<>();
 		Class<?> handlerType = handlerMethod.getBeanType();
 
-		Set<Method> methods = this.binderMethodCache.computeIfAbsent(handlerType, aClass ->
-				MethodIntrospector.selectMethods(handlerType, BINDER_METHODS));
+		// Global methods first
+		this.binderAdviceCache.entrySet().forEach(entry -> {
+			if (entry.getKey().isApplicableToBeanType(handlerType)) {
+				Object bean = entry.getKey().resolveBean();
+				entry.getValue().forEach(method -> result.add(createBinderMethod(bean, method)));
+			}
+		});
 
-		return methods.stream()
-				.map(method -> {
+		this.binderMethodCache
+				.computeIfAbsent(handlerType, aClass -> selectMethods(handlerType, BINDER_METHODS))
+				.forEach(method -> {
 					Object bean = handlerMethod.getBean();
-					SyncInvocableHandlerMethod invocable = new SyncInvocableHandlerMethod(bean, method);
-					invocable.setSyncArgumentResolvers(getInitBinderArgumentResolvers());
-					return invocable;
-				})
-				.collect(Collectors.toList());
+					result.add(createBinderMethod(bean, method));
+				});
+
+		return result;
+	}
+
+	private SyncInvocableHandlerMethod createBinderMethod(Object bean, Method method) {
+		SyncInvocableHandlerMethod invocable = new SyncInvocableHandlerMethod(bean, method);
+		invocable.setSyncArgumentResolvers(getInitBinderArgumentResolvers());
+		return invocable;
 	}
 
 	private List<InvocableHandlerMethod> getAttributeMethods(HandlerMethod handlerMethod) {
 
+		List<InvocableHandlerMethod> result = new ArrayList<>();
 		Class<?> handlerType = handlerMethod.getBeanType();
 
-		Set<Method> methods = this.attributeMethodCache.computeIfAbsent(handlerType, aClass ->
-				MethodIntrospector.selectMethods(handlerType, ATTRIBUTE_METHODS));
+		// Global methods first
+		this.attributeAdviceCache.entrySet().forEach(entry -> {
+			if (entry.getKey().isApplicableToBeanType(handlerType)) {
+				Object bean = entry.getKey().resolveBean();
+				entry.getValue().forEach(method -> result.add(createHandlerMethod(bean, method)));
+			}
+		});
 
-		return methods.stream()
-				.map(method -> {
+		this.attributeMethodCache
+				.computeIfAbsent(handlerType, aClass -> selectMethods(handlerType, ATTRIBUTE_METHODS))
+				.forEach(method -> {
 					Object bean = handlerMethod.getBean();
-					InvocableHandlerMethod invocable = new InvocableHandlerMethod(bean, method);
-					invocable.setArgumentResolvers(getArgumentResolvers());
-					return invocable;
-				})
-				.collect(Collectors.toList());
+					result.add(createHandlerMethod(bean, method));
+				});
+
+		return result;
 	}
 
-	private Mono<HandlerResult> handleException(Throwable ex, HandlerMethod handlerMethod,
-			BindingContext bindingContext, ServerWebExchange exchange) {
+	private InvocableHandlerMethod createHandlerMethod(Object bean, Method method) {
+		InvocableHandlerMethod invocable = new InvocableHandlerMethod(bean, method);
+		invocable.setArgumentResolvers(getArgumentResolvers());
+		return invocable;
+	}
 
-		ExceptionHandlerMethodResolver resolver = this.exceptionHandlerCache
-				.computeIfAbsent(handlerMethod.getBeanType(), ExceptionHandlerMethodResolver::new);
+	private Mono<HandlerResult> handleException(ServerWebExchange exchange, HandlerMethod handlerMethod,
+			BindingContext bindingContext, Throwable ex) {
 
-		Method method = resolver.resolveMethodByExceptionType(ex.getClass());
-
-		if (method != null) {
-			Object bean = handlerMethod.getBean();
-			InvocableHandlerMethod invocable = new InvocableHandlerMethod(bean, method);
-			invocable.setArgumentResolvers(getArgumentResolvers());
+		InvocableHandlerMethod invocable = getExceptionHandlerMethod(ex, handlerMethod);
+		if (invocable != null) {
 			try {
 				if (logger.isDebugEnabled()) {
 					logger.debug("Invoking @ExceptionHandler method: " + invocable.getMethod());
 				}
 				bindingContext.getModel().asMap().clear();
-				return invocable.invoke(exchange, bindingContext, ex);
+				Throwable cause = ex.getCause() != null ? ex.getCause() : ex;
+				return invocable.invoke(exchange, bindingContext, cause, handlerMethod);
 			}
 			catch (Throwable invocationEx) {
 				if (logger.isWarnEnabled()) {
@@ -386,10 +461,36 @@ public class RequestMappingHandlerAdapter implements HandlerAdapter, BeanFactory
 				}
 			}
 		}
-
 		return Mono.error(ex);
 	}
 
+	private InvocableHandlerMethod getExceptionHandlerMethod(Throwable ex, HandlerMethod handlerMethod) {
+
+		Class<?> handlerType = handlerMethod.getBeanType();
+
+		ExceptionHandlerMethodResolver resolver = this.exceptionHandlerCache
+				.computeIfAbsent(handlerType, ExceptionHandlerMethodResolver::new);
+
+		return Optional
+				.ofNullable(resolver.resolveMethodByThrowable(ex))
+				.map(method -> createHandlerMethod(handlerMethod.getBean(), method))
+				.orElseGet(() ->
+						this.exceptionHandlerAdviceCache.entrySet().stream()
+								.map(entry -> {
+									if (entry.getKey().isApplicableToBeanType(handlerType)) {
+										Method method = entry.getValue().resolveMethodByThrowable(ex);
+										if (method != null) {
+											Object bean = entry.getKey().resolveBean();
+											return createHandlerMethod(bean, method);
+										}
+									}
+									return null;
+								})
+								.filter(Objects::nonNull)
+								.findFirst()
+								.orElse(null));
+	}
+
 
 	/**
 	 * MethodFilter that matches {@link InitBinder @InitBinder} methods.

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ControllerAdviceTests.java

@@ -0,0 +1,246 @@
+/*
+ * Copyright 2002-2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.web.reactive.result.method.annotation;
+
+import java.lang.reflect.Method;
+import java.time.Duration;
+import java.util.Collections;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import org.springframework.beans.FatalBeanException;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.Order;
+import org.springframework.mock.http.server.reactive.test.MockServerHttpRequest;
+import org.springframework.mock.http.server.reactive.test.MockServerHttpResponse;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.util.ClassUtils;
+import org.springframework.validation.Validator;
+import org.springframework.web.bind.WebDataBinder;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.InitBinder;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.support.WebExchangeDataBinder;
+import org.springframework.web.method.HandlerMethod;
+import org.springframework.web.reactive.BindingContext;
+import org.springframework.web.reactive.HandlerResult;
+import org.springframework.web.server.ServerWebExchange;
+import org.springframework.web.server.adapter.DefaultServerWebExchange;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Mockito.mock;
+
+/**
+ * {@code @ControllerAdvice} related tests for {@link RequestMappingHandlerAdapter}.
+ * @author Rossen Stoyanchev
+ */
+public class ControllerAdviceTests {
+
+	private ServerWebExchange exchange;
+
+
+	@Before
+	public void setUp() throws Exception {
+		MockServerHttpRequest request = MockServerHttpRequest.get("/").build();
+		MockServerHttpResponse response = new MockServerHttpResponse();
+		this.exchange = new DefaultServerWebExchange(request, response);
+	}
+
+
+	@Test
+	public void resolveExceptionGlobalHandler() throws Exception {
+		testException(new IllegalAccessException(), "SecondControllerAdvice: IllegalAccessException");
+	}
+
+	@Test
+	public void resolveExceptionGlobalHandlerOrdered() throws Exception {
+		testException(new IllegalStateException(), "OneControllerAdvice: IllegalStateException");
+	}
+
+	@Test // SPR-12605
+	public void resolveExceptionWithHandlerMethodArg() throws Exception {
+		testException(new ArrayIndexOutOfBoundsException(), "HandlerMethod: handle");
+	}
+
+	@Test
+	public void resolveExceptionWithAssertionError() throws Exception {
+		AssertionError error = new AssertionError("argh");
+		testException(error, error.toString());
+	}
+
+	@Test
+	public void resolveExceptionWithAssertionErrorAsRootCause() throws Exception {
+		AssertionError cause = new AssertionError("argh");
+		FatalBeanException exception = new FatalBeanException("wrapped", cause);
+		testException(exception, cause.toString());
+	}
+
+	private void testException(Throwable exception, String expected) throws Exception {
+		ApplicationContext context = new AnnotationConfigApplicationContext(TestConfig.class);
+		RequestMappingHandlerAdapter adapter = createAdapter(context);
+
+		TestController controller = context.getBean(TestController.class);
+		controller.setException(exception);
+
+		Object actual = handle(adapter, controller, "handle").getReturnValue().orElse(null);
+		assertEquals(expected, actual);
+	}
+
+	@Test
+	public void modelAttributeAdvice() throws Exception {
+		ApplicationContext context = new AnnotationConfigApplicationContext(TestConfig.class);
+		RequestMappingHandlerAdapter adapter = createAdapter(context);
+		TestController controller = context.getBean(TestController.class);
+
+		Model model = handle(adapter, controller, "handle").getModel();
+
+		assertEquals(2, model.asMap().size());
+		assertEquals("lAttr1", model.asMap().get("attr1"));
+		assertEquals("gAttr2", model.asMap().get("attr2"));
+	}
+
+	@Test
+	public void initBinderAdvice() throws Exception {
+		ApplicationContext context = new AnnotationConfigApplicationContext(TestConfig.class);
+		RequestMappingHandlerAdapter adapter = createAdapter(context);
+		TestController controller = context.getBean(TestController.class);
+
+		Validator validator = mock(Validator.class);
+		controller.setValidator(validator);
+
+		BindingContext bindingContext = handle(adapter, controller, "handle").getBindingContext();
+
+		WebExchangeDataBinder binder = bindingContext.createDataBinder(this.exchange, "name");
+		assertEquals(Collections.singletonList(validator), binder.getValidators());
+	}
+
+
+	private RequestMappingHandlerAdapter createAdapter(ApplicationContext context) throws Exception {
+		RequestMappingHandlerAdapter adapter = new RequestMappingHandlerAdapter();
+		adapter.setApplicationContext(context);
+		adapter.afterPropertiesSet();
+		return adapter;
+	}
+
+	private HandlerResult handle(RequestMappingHandlerAdapter adapter,
+			Object controller, String methodName) throws Exception {
+
+		Method method = controller.getClass().getMethod(methodName);
+		HandlerMethod handlerMethod = new HandlerMethod(controller, method);
+		return adapter.handle(this.exchange, handlerMethod).block(Duration.ZERO);
+	}
+
+
+	@Configuration
+	static class TestConfig {
+
+		@Bean
+		public TestController testController() {
+			return new TestController();
+		}
+
+		@Bean
+		public OneControllerAdvice testExceptionResolver() {
+			return new OneControllerAdvice();
+		}
+
+		@Bean
+		public SecondControllerAdvice anotherTestExceptionResolver() {
+			return new SecondControllerAdvice();
+		}
+	}
+
+	@Controller
+	static class TestController {
+
+		private Validator validator;
+
+		private Throwable exception;
+
+
+		void setValidator(Validator validator) {
+			this.validator = validator;
+		}
+
+		void setException(Throwable exception) {
+			this.exception = exception;
+		}
+
+
+		@InitBinder
+		public void initDataBinder(WebDataBinder dataBinder) {
+			if (this.validator != null) {
+				dataBinder.addValidators(this.validator);
+			}
+		}
+
+		@ModelAttribute
+		public void addAttributes(Model model) {
+			model.addAttribute("attr1", "lAttr1");
+		}
+
+		@GetMapping
+		public void handle() throws Throwable {
+			if (this.exception != null) {
+				throw this.exception;
+			}
+		}
+	}
+
+	@ControllerAdvice
+	@Order(1)
+	static class OneControllerAdvice {
+
+		@ModelAttribute
+		public void addAttributes(Model model) {
+			model.addAttribute("attr1", "gAttr1");
+			model.addAttribute("attr2", "gAttr2");
+		}
+
+		@ExceptionHandler
+		public String handleException(IllegalStateException ex) {
+			return "OneControllerAdvice: " + ClassUtils.getShortName(ex.getClass());
+		}
+
+		@ExceptionHandler(ArrayIndexOutOfBoundsException.class)
+		public String handleWithHandlerMethod(HandlerMethod handlerMethod) {
+			return "HandlerMethod: " + handlerMethod.getMethod().getName();
+		}
+
+		@ExceptionHandler(AssertionError.class)
+		public String handleAssertionError(Error err) {
+			return err.toString();
+		}
+	}
+
+	@ControllerAdvice
+	@Order(2)
+	static class SecondControllerAdvice {
+
+		@ExceptionHandler({IllegalStateException.class, IllegalAccessException.class})
+		public String handleException(Exception ex) {
+			return "SecondControllerAdvice: " + ClassUtils.getShortName(ex.getClass());
+		}
+	}
+
+}

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ModelInitializerTests.java

@@ -31,7 +31,6 @@ import org.springframework.core.ReactiveAdapterRegistry;
 import org.springframework.mock.http.server.reactive.test.MockServerHttpRequest;
 import org.springframework.mock.http.server.reactive.test.MockServerHttpResponse;
 import org.springframework.ui.Model;
-import org.springframework.util.ObjectUtils;
 import org.springframework.validation.Validator;
 import org.springframework.web.bind.WebDataBinder;
 import org.springframework.web.bind.annotation.InitBinder;
@@ -48,8 +47,8 @@ import org.springframework.web.server.adapter.DefaultServerWebExchange;
 
 import static org.junit.Assert.assertEquals;
 import static org.mockito.Mockito.mock;
-import static org.springframework.web.reactive.result.method.annotation.RequestMappingHandlerAdapter.BINDER_METHODS;
 import static org.springframework.web.reactive.result.method.annotation.RequestMappingHandlerAdapter.ATTRIBUTE_METHODS;
+import static org.springframework.web.reactive.result.method.annotation.RequestMappingHandlerAdapter.BINDER_METHODS;
 
 /**
  * Unit tests for {@link ModelInitializer}.
@@ -76,8 +75,10 @@ public class ModelInitializerTests {
 	@SuppressWarnings("unchecked")
 	@Test
 	public void basic() throws Exception {
+		TestController controller = new TestController();
+
 		Validator validator = mock(Validator.class);
-		Object controller = new TestController(validator);
+		controller.setValidator(validator);
 
 		List<SyncInvocableHandlerMethod> binderMethods = getBinderMethods(controller);
 		List<InvocableHandlerMethod> attributeMethods = getAttributeMethods(controller);
@@ -131,16 +132,18 @@ public class ModelInitializerTests {
 	@SuppressWarnings("unused")
 	private static class TestController {
 
-		private Validator[] validators;
+		private Validator validator;
 
-		public TestController(Validator... validators) {
-			this.validators = validators;
+
+		void setValidator(Validator validator) {
+			this.validator = validator;
 		}
 
+
 		@InitBinder
 		public void initDataBinder(WebDataBinder dataBinder) {
-			if (!ObjectUtils.isEmpty(this.validators)) {
-				dataBinder.addValidators(this.validators);
+			if (this.validator != null) {
+				dataBinder.addValidators(this.validator);
 			}
 		}