Spring : ClassNotFound 异常
Spring : ClassNotFound exception
我正在 spring mvc 中开始一个新项目,当我尝试 运行 hello world 时,它抛出错误 :
这是我的调度员-servlet.xml映射:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<bean name="/welcome.html"
class="com.shaurya.FirstController" />
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
<property name="prefix">
<value>/WEB-INF/jsp/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
</beans>
这是web.xml:
<web-app id="WebApp_ID" version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Spring Web MVC Application</display-name>
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
</web-app>
控制器代码在这里:
package com.shaurya;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController
public class FirstController extends AbstractController{
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request,
HttpServletResponse response) throws Exception {
String message="welcome to Spring";
ModelAndView model= new ModelAndView("welcome");
model.addObject("message", message);
return model;
}
}
这是控制器呈现 welcome.jsp:
的视图页面
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<a href="welcome.html">sdsd</a>
</body>
</html>
为什么会报错,好像是这样的:
org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.shaurya.FirstController] for bean with name'/welcome.html' enter code heredefined in ServletContext resource [/WEB-INF/mvc-dispatcher-servlet.xml]; nested exception is java.lang.ClassNotFoundException: com.shaurya.FirstController.
这里缺少什么有什么建议吗?
你可以尝试更改此代码吗
<bean name="/welcome.html"
class="com.shaurya.FirstController" />
至此
<bean name="/welcome"
class="com.shaurya.FirstController" />
由于 .html 的映射已经在 web.xml 中完成,您可能不需要在 bean 映射中再次提及它
我正在 spring mvc 中开始一个新项目,当我尝试 运行 hello world 时,它抛出错误 :
这是我的调度员-servlet.xml映射:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<bean name="/welcome.html"
class="com.shaurya.FirstController" />
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
<property name="prefix">
<value>/WEB-INF/jsp/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
</beans>
这是web.xml:
<web-app id="WebApp_ID" version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Spring Web MVC Application</display-name>
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
</web-app>
控制器代码在这里:
package com.shaurya;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController
public class FirstController extends AbstractController{
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request,
HttpServletResponse response) throws Exception {
String message="welcome to Spring";
ModelAndView model= new ModelAndView("welcome");
model.addObject("message", message);
return model;
}
}
这是控制器呈现 welcome.jsp:
的视图页面 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<a href="welcome.html">sdsd</a>
</body>
</html>
为什么会报错,好像是这样的:
org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.shaurya.FirstController] for bean with name'/welcome.html' enter code heredefined in ServletContext resource [/WEB-INF/mvc-dispatcher-servlet.xml]; nested exception is java.lang.ClassNotFoundException: com.shaurya.FirstController.
这里缺少什么有什么建议吗?
你可以尝试更改此代码吗
<bean name="/welcome.html"
class="com.shaurya.FirstController" />
至此
<bean name="/welcome"
class="com.shaurya.FirstController" />
由于 .html 的映射已经在 web.xml 中完成,您可能不需要在 bean 映射中再次提及它