英文:
Spring java.lang.NoClassDefFoundError error
问题
我是Spring框架的新手，正在按照tutorialspoint.com上的教程学习。在包含所有内容后，当我运行程序时，它给了我以下错误：
> 错误：无法初始化主类com.raza.spring.MainApp
> 引发的错误：java.lang.NoClassDefFoundError: org/springframework/context/ApplicationContext
以下是我的项目结构：
点击此处查看图片描述
以下是我的代码：
Hello类：
package com.raza.spring;
public class Hello {
private String message;
public void setMessage(String message) {
this.message = message;
}
public String getMessage() {
return this.message;
}
}
MainApp类：
package com.raza.spring;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MainApp {
public static void main(String[] args) {
// TODO Auto-generated method stub
ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
Hello obj = (Hello) context.getBean("helloWorld");
obj.getMessage();
}
}
Beans.xml：
<?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="helloWorld" class="com.raza.spring.Hello">
<property name="message" value="Hello raza world !!!"/>
</bean>
</beans>
我无法弄清楚问题出在哪里。提前感谢您的帮助。
我正在尝试tutorialspoint.com上的教程，并期望在控制台上看到输出。
英文:
I am new to spring framework and following the tutorial on tutorialspoint.com. After including every thing, while running the program it gives me following error:
> Error: Unable to initialize main class com.raza.spring.MainApp
> Caused by: java.lang.NoClassDefFoundError: org/springframework/context/ApplicationContext
Below is my project structure:
enter image description here
Here is the code:
Class Hello:
package com.raza.spring;
public class Hello {
private String message;
public void setMessage(String message) {
this.message = message;
}
public String getMessage() {
return this.message;
}
}
Class MainApp:
package com.raza.spring;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class MainApp {
public static void main(String[] args) {
// TODO Auto-generated method stub
ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
Hello obj = (Hello) context.getBean("helloWorld");
obj.getMessage();
}
}
Beans.xml
<?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 = "helloWorld" class = "com.raza.spring.Hello">
<property name = "message" value = "Hello raza world !!!"/>
</bean>
</beans>
Not able to get what is wrong here. Thanks in advance.
I am trying tutorial on tutorialspoint.com and expecting an output on the console.
答案1
得分: 1
java.lang.NoClassDefFoundError: org/springframework/context/ApplicationContext 意味着你的代码中使用的类在你的项目中不可访问。
在之前的章节 https://www.tutorialspoint.com/spring/spring_environment_setup.htm 中，你可能在第4步下载了Spring库。尝试将其添加到你的类路径中：https://wiki.eclipse.org/FAQ_How_do_I_add_an_extra_library_to_my_project%27s_classpath%3F。
我强烈建议你开始使用Maven。它使你能够更轻松地添加外部库，而无需手动从Git仓库或网站下载它们。
同时，请查看Baeldung的课程。他们的示例始终使用最新的Spring版本：https://www.baeldung.com/spring-tutorial
英文:
java.lang.NoClassDefFoundError: org/springframework/context/ApplicationContext tells that the Class you are using in your code is not accessible from your project.
In previous chapter on https://www.tutorialspoint.com/spring/spring_environment_setup.htm you probably downloaded spring library in step 4. Try adding it to your classpath: https://wiki.eclipse.org/FAQ_How_do_I_add_an_extra_library_to_my_project%27s_classpath%3F.
I highly recommend you start using maven. It allows you to add external libraries a lot easier, without having to manually download them from a git repo or a website.
Also, check the Baeldung courses. Their examples always use the latest Spring version https://www.baeldung.com/spring-tutorial
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