java - Spring : Bean class is not recognised by the spring and throwing ClassNotFoundException

Question

我是 spring 框架的新手，正在尝试一个简单的例子。

我的 com.xyz.model 包中有一个名为“Triangle”的 bean 类，我的 com.xyz.DrawingApp 包中有一个名为 DrawingApp 的主类。

这是我的 spring.xml 配置文件:

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

<bean id="triangle" class="com.xyz.model.Triangle">
</bean>

</beans>

三角.java

package com.xyz.model;

public class Triangle {
public void draw() {
    System.out.println("Triangle drawn");
}
}

DrawingApp.java

ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
Triangle triangle = (Triangle)context.getBean("triangle");
triangle.draw();

我已经包含了这些 jar :

org.springframework.aop-3.1.2.RELEASE.jar
org.springframework.asm-3.1.2.RELEASE.jar
org.springframework.aspects-3.1.2.RELEASE.jar
org.springframework.beans-3.1.2.RELEASE.jar
org.springframework.context.support-3.1.2.RELEASE.jar
org.springframework.context-3.1.2.RELEASE.jar
org.springframework.core-3.1.2.RELEASE.jar
org.springframework.expression-3.1.2.RELEASE.jar
org.springframework.instrument.tomcat-3.1.2.RELEASE.jar
org.springframework.instrument-3.1.2.RELEASE.jar
org.springframework.jdbc-3.1.2.RELEASE.jar
org.springframework.jms-3.1.2.RELEASE.jar
org.springframework.orm-3.1.2.RELEASE.jar
org.springframework.oxm-3.1.2.RELEASE.jar
org.springframework.test-3.1.2.RELEASE.jar
org.springframework.transaction-3.1.2.RELEASE.jar
org.springframework.web.portlet-3.1.2.RELEASE.jar
org.springframework.web.servlet-3.1.2.RELEASE.jar
org.springframework.web.struts-3.1.2.RELEASE.jar
org.springframework.web-3.1.2.RELEASE.jar

commons-logging-1.1.3.jar
commons-logging-1.1.3-javadoc.jar
commons-logging-1.1.3-sources.jar
commons-logging-1.1.3-tests.jar
commons-logging-1.1.3-test-sources.jar
commons-logging-adapters-1.1.3.jar
commons-logging-api-1.1.3.jar
commons-logging-tests.jar

我的类和xml文件位置是:

Triangle class is in this path -- com.xyz.model - SpringBeanFactory/src
DrawingApp class is in this path -- com.xyz.DrawingApp - SpringBeanFactory/src
spring.xml - SpringBeanFactory/src

我遇到了这个异常:

Exception in thread "main" org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.xyz.model.Triangle] for bean with name 'triangle' defined in class path resource [spring.xml]; nested exception is java.lang.ClassNotFoundException: com.xyz.model.Triangle
    at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1262)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:576)
    at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1331)
    at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:897)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:590)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:469)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at com.fulcum.DrawingApp.DrawingApp.main(DrawingApp.java:31)
Caused by: java.lang.ClassNotFoundException: com.xyz.model.Triangle
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at org.springframework.util.ClassUtils.forName(ClassUtils.java:258)
    at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:417)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1283)
    at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1254)
    ... 9 more

有人可以指导我解决我的问题吗？

Answer 1

@xyz : 在你的 spring.xml 文件中替换这段代码:

<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
  xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">



    <bean id="triangle" class="com.xyz.model.Triangle">
    </bean>

</beans>

然后告诉我结果。