将我的Spring MVC应用程序升级到Spring 3.2之后，访问某些URL时出现以下异常：

org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation
    at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.handleNoMatch(RequestMappingInfoHandlerMapping.java:203) ~[spring-webmvc-3.2.0.RELEASE.jar:3.2.0.RELEASE]
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lookupHandlerMethod(AbstractHandlerMethodMapping.java:272) ~[spring-webmvc-3.2.0.RELEASE.jar:3.2.0.RELEASE]
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:212) ~[spring-webmvc-3.2.0.RELEASE.jar:3.2.0.RELEASE]
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.getHandlerInternal(AbstractHandlerMethodMapping.java:55) ~[spring-webmvc-3.2.0.RELEASE.jar:3.2.0.RELEASE]
    at org.springframework.web.servlet.handler.AbstractHandlerMapping.getHandler(AbstractHandlerMapping.java:297) ~[spring-webmvc-3.2.0.RELEASE.jar:3.2.0.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1091) ~[spring-webmvc-3.2.0.RELEASE.jar:3.2.0.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1076) ~[spring-webmvc-3.2.0.RELEASE.jar:3.2.0.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:896) ~[spring-webmvc-3.2.0.RELEASE.jar:3.2.0.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) ~[spring-webmvc-3.2.0.RELEASE.jar:3.2.0.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:915) [spring-webmvc-3.2.0.RELEASE.jar:3.2.0.RELEASE]
(...)

此异常导致HTTP 406 NOT ACCEPTABLE。

我设法用无法访问的URL创建了一个简化的控制器：

@RequestMapping(value = "/resources/foo.js", produces = "text/javascript")
@ResponseBody
public String foo() throws Exception {
    return "";
}

由于我使用的是其中有一个正常的浏览器*/*在Accept-header，我不明白为什么我应该得到一个HTTP
406是什么让这个更奇怪的是，这个代码工作与Spring 3.1.2，但与春3.2。这是为什么？