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Fix issue with resolving Errors controller argument 

The ErrorsMethodArgumentResolver expects the preceding @ModelAttribute
in the controller method signature to be the last one added in the
model -- an assumption that can break if a model attribute is added
earlier (e.g. through a @ModelAttribute method) and more attributes
are added as well. This fix ensures when an @ModelAttribute is resolved
as a controller method argument it has the highest index in the model.

Issue: SPR-9378
This commit is contained in:
Rossen Stoyanchev 2012-05-10 16:01:14 -04:00
parent e04b322110
commit c499df2315
4 changed files with 140 additions and 92 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
spring-web/src/main/java/org/springframework/web/method/annotation/ModelAttributeMethodProcessor.java
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@ -17,10 +17,10 @@
package org.springframework.web.method.annotation;
import java.lang.annotation.Annotation;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeanUtils;
import org.springframework.core.MethodParameter;
import org.springframework.core.annotation.AnnotationUtils;
@ -31,7 +31,6 @@ import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.bind.support.WebRequestDataBinder;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.annotation.ModelFactory;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
import org.springframework.web.method.support.ModelAndViewContainer;
@ -99,10 +98,10 @@ public class ModelAttributeMethodProcessor implements HandlerMethodArgumentResol
throws Exception {
String name = ModelFactory.getNameForParameter(parameter);
Object target = (mavContainer.containsAttribute(name)) ?
Object attribute = (mavContainer.containsAttribute(name)) ?
mavContainer.getModel().get(name) : createAttribute(name, parameter, binderFactory, request);
WebDataBinder binder = binderFactory.createBinder(request, target, name);
WebDataBinder binder = binderFactory.createBinder(request, attribute, name);
if (binder.getTarget() != null) {
bindRequestParameters(binder, request);
validateIfApplicable(binder, parameter);
@ -113,7 +112,12 @@ public class ModelAttributeMethodProcessor implements HandlerMethodArgumentResol
}
}
mavContainer.addAllAttributes(binder.getBindingResult().getModel());
// Add resolved attribute and BindingResult at the end of the model
Map<String, Object> bindingResultModel = binder.getBindingResult().getModel();
mavContainer.removeAttributes(bindingResultModel);
mavContainer.addAllAttributes(bindingResultModel);
return binder.getTarget();
}

24
spring-web/src/main/java/org/springframework/web/method/support/ModelAndViewContainer.java
View File

@ -1,5 +1,5 @@
/*
* Copyright 2002-2011 the original author or authors.
* Copyright 2002-2012 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.
@ -188,7 +188,7 @@ public class ModelAndViewContainer {
/**
* Add the supplied attribute to the underlying model.
* @see ModelMap#addAttribute(String, Object)
* A shortcut for {@code getModel().addAttribute(String, Object)}.
*/
public ModelAndViewContainer addAttribute(String name, Object value) {
getModel().addAttribute(name, value);
@ -197,7 +197,7 @@ public class ModelAndViewContainer {
/**
* Add the supplied attribute to the underlying model.
* @see Model#addAttribute(Object)
* A shortcut for {@code getModel().addAttribute(Object)}.
*/
public ModelAndViewContainer addAttribute(Object value) {
getModel().addAttribute(value);
@ -206,7 +206,7 @@ public class ModelAndViewContainer {
/**
* Copy all attributes to the underlying model.
* @see ModelMap#addAllAttributes(Map)
* A shortcut for {@code getModel().addAllAttributes(Map)}.
*/
public ModelAndViewContainer addAllAttributes(Map<String, ?> attributes) {
getModel().addAllAttributes(attributes);
@ -216,16 +216,28 @@ public class ModelAndViewContainer {
/**
* Copy attributes in the supplied <code>Map</code> with existing objects of
* the same name taking precedence (i.e. not getting replaced).
* @see ModelMap#mergeAttributes(Map)
* A shortcut for {@code getModel().mergeAttributes(Map<String, ?>)}.
*/
public ModelAndViewContainer mergeAttributes(Map<String, ?> attributes) {
getModel().mergeAttributes(attributes);
return this;
}
/**
* Remove the given attributes from the model.
*/
public ModelAndViewContainer removeAttributes(Map<String, ?> attributes) {
if (attributes != null) {
for (String key : attributes.keySet()) {
getModel().remove(key);
}
}
return this;
}
/**
* Whether the underlying model contains the given attribute name.
* @see ModelMap#containsAttribute(String)
* A shortcut for {@code getModel().containsAttribute(String)}.
*/
public boolean containsAttribute(String name) {
return getModel().containsAttribute(name);

62
spring-web/src/test/java/org/springframework/web/method/annotation/ModelAttributeMethodProcessorTests.java
View File

@ -1,5 +1,5 @@
/*
* Copyright 2002-2011 the original author or authors.
* Copyright 2002-2012 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.
@ -27,6 +27,7 @@ import org.springframework.beans.TestBean;
import org.springframework.core.MethodParameter;
import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.validation.BindException;
import org.springframework.validation.BindingResult;
import org.springframework.validation.Errors;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.ModelAttribute;
@ -141,13 +142,13 @@ public class ModelAttributeMethodProcessorTests {
}
@Test
public void getAttributeFromModel() throws Exception {
testGetAttributeFromModel("attrName", paramNamedValidModelAttr);
testGetAttributeFromModel("testBean", paramModelAttr);
testGetAttributeFromModel("testBean", paramNonSimpleType);
public void resovleArgumentFromModel() throws Exception {
getAttributeFromModel("attrName", paramNamedValidModelAttr);
getAttributeFromModel("testBean", paramModelAttr);
getAttributeFromModel("testBean", paramNonSimpleType);
}
private void testGetAttributeFromModel(String expectedAttributeName, MethodParameter param) throws Exception {
private void getAttributeFromModel(String expectedAttributeName, MethodParameter param) throws Exception {
Object target = new TestBean();
mavContainer.addAttribute(expectedAttributeName, target);
@ -162,7 +163,7 @@ public class ModelAttributeMethodProcessorTests {
}
@Test
public void createAttribute() throws Exception {
public void resovleArgumentViaDefaultConstructor() throws Exception {
WebDataBinder dataBinder = new WebRequestDataBinder(null);
WebDataBinderFactory factory = createMock(WebDataBinderFactory.class);
@ -175,13 +176,14 @@ public class ModelAttributeMethodProcessorTests {
}
@Test
public void automaticValidation() throws Exception {
public void resovleArgumentValidation() throws Exception {
String name = "attrName";
Object target = new TestBean();
mavContainer.addAttribute("attrName", target);
mavContainer.addAttribute(name, target);
StubRequestDataBinder dataBinder = new StubRequestDataBinder(target);
StubRequestDataBinder dataBinder = new StubRequestDataBinder(target, name);
WebDataBinderFactory binderFactory = createMock(WebDataBinderFactory.class);
expect(binderFactory.createBinder(webRequest, target, "attrName")).andReturn(dataBinder);
expect(binderFactory.createBinder(webRequest, target, name)).andReturn(dataBinder);
replay(binderFactory);
processor.resolveArgument(paramNamedValidModelAttr, mavContainer, webRequest, binderFactory);
@ -191,20 +193,46 @@ public class ModelAttributeMethodProcessorTests {
}
@Test(expected=BindException.class)
public void bindException() throws Exception {
public void resovleArgumentBindException() throws Exception {
String name = "testBean";
Object target = new TestBean();
mavContainer.getModel().addAttribute(target);
StubRequestDataBinder dataBinder = new StubRequestDataBinder(target);
StubRequestDataBinder dataBinder = new StubRequestDataBinder(target, name);
dataBinder.getBindingResult().reject("error");
WebDataBinderFactory binderFactory = createMock(WebDataBinderFactory.class);
expect(binderFactory.createBinder(webRequest, target, "testBean")).andReturn(dataBinder);
expect(binderFactory.createBinder(webRequest, target, name)).andReturn(dataBinder);
replay(binderFactory);
processor.resolveArgument(paramNonSimpleType, mavContainer, webRequest, binderFactory);
}
// SPR-9378
@Test
public void resolveArgumentOrdering() throws Exception {
String name = "testBean";
Object testBean = new TestBean(name);
mavContainer.addAttribute(name, testBean);
mavContainer.addAttribute(BindingResult.MODEL_KEY_PREFIX + name, testBean);
Object anotherTestBean = new TestBean();
mavContainer.addAttribute("anotherTestBean", anotherTestBean);
StubRequestDataBinder dataBinder = new StubRequestDataBinder(testBean, name);
WebDataBinderFactory binderFactory = createMock(WebDataBinderFactory.class);
expect(binderFactory.createBinder(webRequest, testBean, name)).andReturn(dataBinder);
replay(binderFactory);
processor.resolveArgument(paramModelAttr, mavContainer, webRequest, binderFactory);
assertSame("Resolved attribute should be updated to be last in the order",
testBean, mavContainer.getModel().values().toArray()[1]);
assertSame("BindingResult of resolved attribute should be last in the order",
dataBinder.getBindingResult(), mavContainer.getModel().values().toArray()[2]);
}
@Test
public void handleAnnotatedReturnValue() throws Exception {
processor.handleReturnValue("expected", returnParamNamedModelAttr, mavContainer, webRequest);
@ -225,8 +253,8 @@ public class ModelAttributeMethodProcessorTests {
private boolean validateInvoked;
public StubRequestDataBinder(Object target) {
super(target);
public StubRequestDataBinder(Object target, String objectName) {
super(target, objectName);
}
public boolean isBindInvoked() {
@ -248,6 +276,8 @@ public class ModelAttributeMethodProcessorTests {
public void validate(Object... validationHints) {
validateInvoked = true;
}
}
@Target({ METHOD, FIELD, CONSTRUCTOR, PARAMETER })

2
src/dist/changelog.txt vendored
View File

@ -14,6 +14,8 @@ Changes in version 3.2 M1
* add Servlet 3.0 based async support
* fix issue with encoded params in UriComponentsBuilder
* add Jackson 2 HttpMessageConverter and View types
* add pretty print option to Jackson HttpMessageConverter and View types
* fix issue with resolving Errors controller method argument
Changes in version 3.1.1 (2012-02-16)
-------------------------------------