Java Spring 3.1+；参数解析程序无法处理私有Person类参数

我刚从Spring3.0升级到3.2。我在spring配置xml文件中配置了如下自定义参数解析器：

<mvc:annotation-driven>
  <mvc:argument-resolvers>
    <bean class="mycompany.api.PersonResolver" />   
  </mvc:argument-resolvers>
</mvc:annotation-driven>

其中Person类是我们自己的专有类

然而，这是行不通的。这给了我一个错误：

Rest call error argument type mismatch
HandlerMethod details: 
    Controller [MyController]
    ...
    Resolved arguments: 
    [0] [type=org.springframework.validation.support.BindingAwareModelMap] [value=    {org.springframework.validation.BindingResult.objectNode=org.springframework.validation.BeanPropertyBindingResult: 0 errors}]

    java.lang.IllegalArgumentException: argument type mismatch

似乎将Person参数类型更改为其他类型（在我的示例中：PersonWrapper，包含对Person的引用）为我提供了解决问题的方法，即Spring现在可以解决该参数

有人能给我解释一下吗？这是因为Spring使用java反射，并且与某个Spring Person类（Spring security有一个org.springframework.security.ldap.userdetails.Person类）存在名称冲突吗

我的解析器的实现： 我最初的实现如下所示：

import mycompany.Person;

public class PersonResolver implements HandlerMethodArgumentResolver  {
    public boolean supportsParameter(MethodParameter mp) {
      return mp.getParameterType().equals(Person.class);
}

    public Object resolveArgument(MethodParameter mp, ModelAndViewContainer mavc, NativeWebRequest nwr, WebDataBinderFactory wdbf) throws Exception {
      if(mp.getParameterType().equals(Person.class)) {
        ...
        return somePerson;
      }
      return UNRESOLVED;
    }
}

弹簧配置：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p" 
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans  http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/mvc   http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

    <context:annotation-config /> 

    <!-- automatically search for Controller classes using @Controller annotation -->
    <context:component-scan base-package="mycompany.api"/>

    <!-- we use Spring 3 annotation driven development -->
    <mvc:annotation-driven>
        <mvc:argument-resolvers>
                <bean class="mycompany.api.PersonResolver" />   
                <bean class="mycompany.api.SessionLocaleResolver"/>
        </mvc:argument-resolvers>
    </mvc:annotation-driven>

</beans>

它不应该引起任何名称冲突问题，因为软件包就是这样发明的。您能否向我们展示

PersonResolver

实现？您能否发布

DispatcherServlet

的完整配置。请在

PersonResolver

初始化代码中添加日志语句，以帮助确定它是否实际加载。如果您的示例是准确的，那么XML Beans文件中的包名与实际类不匹配。它在启动时被调用。当我使用我的变通包装类时，它也调用supportsParameter方法，但对于我的Person参数，它甚至不调用此方法……我现在发现我们的Person类实现了映射接口，这导致了问题。当我试图解决实现映射接口的参数时，它失败了！显然，SpringMVC试图在我们自己的解析器得到机会之前解决它。

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p" 
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans  http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/mvc   http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

    <context:annotation-config /> 

    <!-- automatically search for Controller classes using @Controller annotation -->
    <context:component-scan base-package="mycompany.api"/>

    <!-- we use Spring 3 annotation driven development -->
    <mvc:annotation-driven>
        <mvc:argument-resolvers>
                <bean class="mycompany.api.PersonResolver" />   
                <bean class="mycompany.api.SessionLocaleResolver"/>
        </mvc:argument-resolvers>
    </mvc:annotation-driven>

</beans>