[英]Spring Exception Handling : org.springframework.beans.factory.CannotLoadBeanClassException
I am getting error : 我收到错误消息 :
java.lang.ClassNotFoundException: org.springframework.web.servlet.handler.SimpleMappingExceptionResolver java.lang.ClassNotFoundException:org.springframework.web.servlet.handler.SimpleMappingExceptionResolver
I am hitting URL : http://localhost:8080/SpringMvcExceptionHandling/student on my local machine 我在本地计算机上访问URL: http:// localhost:8080 / SpringMvcExceptionHandling / student
Full Strack Trace is : 完整的跟踪记录是:
I have already checked most of the question/answer but not getting any help to resolve my issue,Please help. 我已经检查了大多数问题/答案,但没有得到任何解决我问题的帮助,请帮助。
Here is what I have done : I am working on Spring Exception Handling with Jars(Spring-3.1.2). 这是我所做的事情:我正在使用Jars(Spring-3.1.2)进行Spring异常处理。 I am not using maven. 我不使用Maven。
web.xml file web.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5">
<servlet>
<servlet-name>SpringMvcExceptionHandling</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>SpringMvcExceptionHandling</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
SpringMvcExceptionHandling-servlet.xml file SpringMvcExceptionHandling-servlet.xml文件
<?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-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">
<context:component-scan base-package="com.exceptionhandling.mvc.controller" />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/view/" />
<property name="suffix" value=".jsp" />
</bean>
<bean
class="org.springframework.web.servlet.handler.
SimpleMappingExceptionResolver">
<property name="exceptionMappings">
<props>
<prop key="com.exceptionhandling.mvc.controller.SpringException">
ExceptionPage
</prop>
<prop key="java.lang.Exception">error</prop>
</props>
</property>
<property name="defaultErrorView" value="/error" />
</bean>
</beans>
StudentController.java StudentController.java
package com.exceptionhandling.mvc.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import com.exceptionhandling.mvc.model.Student;
@Controller
public class StudentController {
@RequestMapping(value = "/student")
public ModelAndView student() {
return new ModelAndView("student", "command", new Student());
}
@RequestMapping(value = "/addStudent", method = RequestMethod.POST)
@ExceptionHandler({SpringException.class})
public String addStudent(@ModelAttribute("SpringMvcExceptionHandling") Student student,
ModelMap model) {
if (student.getName().length() < 5) {
throw new SpringException("Given name is too short");
} else {
model.addAttribute("name", student.getName());
}
if (student.getAge() < 10) {
throw new SpringException("Given age is too low");
} else {
model.addAttribute("age", student.getAge());
}
model.addAttribute("id", student.getId());
return "result";
}
}
SpringException.java SpringException.java
package com.exceptionhandling.mvc.controller;
public class SpringException extends RuntimeException {
private static final long serialVersionUID = 1L;
private String exceptionMsg;
public SpringException(String exceptionMsg) {
this.exceptionMsg = exceptionMsg;
}
public String getExceptionMsg() {
return exceptionMsg;
}
public void setExceptionMsg(String exceptionMsg) {
this.exceptionMsg = exceptionMsg;
}
}
My Project Structure Looks Like 我的项目结构看起来像
Jars 罐子
Added Two External Jars : 添加了两个外部Jar:
In your SpringMvcExceptionHandling-servlet.xml
file, your bean class name must be fully qualified (with no spaces in between). 在您的SpringMvcExceptionHandling-servlet.xml
文件中,您的bean类名称必须是完全限定的 (之间没有空格)。
So your solution must be: 因此,您的解决方案必须是:
<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
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