Question

我正在尝试使用Spring 4创建一个Rest控制器。我还使用mongodb作为数据库，使用Tomcat 7作为webserver。当我尝试提交任何Rest请求时，我收到此错误消息：

    type Exception report

message Servlet execution threw an exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet execution threw an exception
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.lang.NoClassDefFoundError: Could not initialize class org.springframework.web.context.request.ServletRequestAttributes
    org.springframework.web.servlet.FrameworkServlet.buildRequestAttributes(FrameworkServlet.java:996)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:923)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:822)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.56 logs.

我在我的pom.xml中使用那些版本

<!-- Web -->
    <jsp.version>2.2</jsp.version>
    <jstl.version>1.2</jstl.version>
    <servlet.version>2.5</servlet.version>

    <!-- Spring -->
    <spring-framework.version>4.0.0.RELEASE</spring-framework.version>

    <!-- spring-web -->
    <spring-web.version>4.1.2.RELEASE</spring-web.version>

    <!-- Spring data for MongoDB -->
    <springframework.data-version>1.6.1.RELEASE</springframework.data-version>

这是使用的控制器类：

@RestController
@RequestMapping("/rest/user")
public class UserContoller {

    @Autowired
    UserServices userServices;

    @RequestMapping(value = "/{username}", method = RequestMethod.GET)
    public @ResponseBody User findUserByUsername(@PathVariable ("username") String username){
        return userServices.findUserByUsername(username);

    }

}

你能帮帮我吗？提前谢谢你

Answer 1

我有一个类似的问题，我相信一系列事情解决了这个问题：

确保servlet.xml中有以下两行并按此顺序排列（意味着必须在default-servlet-handler之前列出注释驱动）

<mvc:annotation-driven /> 

<mvc:default-servlet-handler />

<bean id="viewResolver"
      class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/"></property>
    <property name="suffix" value=".jsp"></property>
</bean>

*任何等效的viewResolver bean都可以。

确保它位于您的web.xml中：

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

我看到你没有提到你GET会产生什么。例如：我的@RequestMapping produces = MediaType.APPLICATION_JSON_VALUE
最后，我不确定为什么，但每次添加新的控制器映射时，我都需要运行Maven Install生命周期，或者它没有看到新的映射。这个问题我还在努力解决。

Answer 2

我这样解决了：

@RequestMapping(value = "/user", method = RequestMethod.GET, produces = "application/json")
@ResponseBody
public User  findUsername(@RequestParam("username") String username) {
    logger.info("Searcing for user using his username");
    return userServices.findUserByUsername(username);
}

无法初始化类org.springframework.web.context.request.ServletRequestAttributes

2 个答案: