Spring-MVC 406不可接受而不是JSON响应 [英] Spring-MVC 406 Not Acceptable instead of JSON Response
问题描述
我正在尝试使用Spring 3.0.6返回JSON响应，但我收到406响应Not Acceptable，其描述为：
此请求标识的资源只能生成响应具有特征
根据请求接受标题（）不可接受。
I'm trying to return a JSON response with Spring 3.0.6, but I get a 406 response "Not Acceptable", with the description: "The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers ()."
我知道一个非常类似的问题之前曾被问过，但我不能让它适用于我的项目，尽管有很多
测试，我不明白我做错了什么。
I know that a very similar question has been asked before, but I can't make it work for my project, despite many tests and I don't understand what I'm doing wrong.
在我的Maven pom.xml中，我有以下内容：
In my Maven pom.xml I've the following:
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.8.5</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.8.5</version>
<scope>compile</scope>
</dependency>
在web.xml中我引用webmvc-config.xml，日志确认已加载。
In web.xml I reference webmvc-config.xml, and the log confirms that is loaded.
<servlet>
<servlet-name>mainServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/webmvc-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
在webmvc-config.xml中我有以下内容：
In webmvc-config.xml I've the following:
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<mvc:annotation-driven />
我的控制器是：
@Controller
public class ClassifiedController {
@RequestMapping(value = "/classified/{idClassified}", headers = "Accept=*/*",
method = RequestMethod.GET)
@ResponseBody
public final Classified getClassified(@PathVariable final int idClassified) {
...
我尝试使用或不使用headers参数并获得相同的结果。如果我直接使用Firefox调用URL
，请求标题包含以下内容（使用firebug进行检查）：
I tried with or without the headers parameter with the same results. If I call the URL directly with Firefox the Request Headers contain the following (checked with firebug):
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
如果我使用以下JQuery：
If I use the following JQuery:
$.ajax({
url: '/classified/38001',
type: 'GET',
dataType: 'json'
});
发送以下标题：
Accept: application/json, text/javascript, */*; q=0.01
在这两种情况下，结果都是406错误。我不知道还应该检查什么才能使
工作。
In both cases the result is a 406 error. I don't know what else should I check to make it work.
UPDATE ：我决定通过Spring进行调试，我发现Jackson被正确调用，并且在org.codehaus.jackson.map.ser.StdSerializerProvider中，方法_findExplicitUntypedSerializer包含以下代码：
UPDATE: I decided to debug through Spring and I found out that Jackson was called correctly and in org.codehaus.jackson.map.ser.StdSerializerProvider the method _findExplicitUntypedSerializer contains the following code:
try {
return _createAndCacheUntypedSerializer(runtimeType, property);
} catch (Exception e) {
return null;
}
这是不幸的，因为隐藏了问题的根源。使用调试器，我发现该异常包含一个非常描述性的错误消息：
This is unfortunate because hides the source of the problem. With the debugger I found out that that exception contained a very descriptive error message:
Conflicting getter definitions for property "reminded":
ClassifiedImpl#isReminded(0 params) vs
ClassifiedImpl#getReminded(0 params)
现在我看到错误消息是一个愚蠢的错误并且很容易修复，但没有它就不那么明显了。事实上，修复问题，导致工作序列化。
Now that I see the error message is a silly mistake and easy to fix, but without that it wasn't that obvious. In fact, fixing the problem, leaded to a working serialization.
推荐答案
就 MappingJacksonJson 处理，你'我需要确保 Jackson ObjectMapper 支持您的对象类型以进行序列化。
In terms of the MappingJacksonJson processing, you'll need to make sure that the Jackson ObjectMapper supports your object type for serialisation.
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