java.lang.NoClassDefFoundError: org/springframework/context/ApplicationContext maven
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java.lang.NoClassDefFoundError: org/springframework/context/ApplicationContext maven
提问by Adnan
I am new to spring and maven. I have a simple hello world project using Spring . The project builds successfully but i face the following error at runtime:
我是 spring 和 maven 的新手。我有一个使用 Spring 的简单 hello world 项目。该项目成功构建，但我在运行时遇到以下错误：
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/context/ApplicationContext
This is the main app: App.java
这是主应用程序：App.java
package com.test.SpringMaven2;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
/**
* Hello world!
*
*/
public class App
{
public static void main( String[] args )
{
System.out.println( "Hello World!" );
System.out.println( "Hello World!" );
ApplicationContext context = new AnnotationConfigApplicationContext(HelloWorldConfig.class);
HelloWorld hello = (HelloWorld) context.getBean("helloWorld");
hello.setName("Adnan");
hello.getName();
}
}
This is the HelloWorld bean
这是HelloWorld bean
package com.test.SpringMaven2;
public class HelloWorld{
private String name;
public void setName(String name){
this.name = name;
}
public void getName(){
System.out.println("Hello, " + name);
}
}
This is the annotation based configuration file:
这是基于注解的配置文件：
package com.test.SpringMaven2;
import org.springframework.context.annotation.*;
@Configuration
public class HelloWorldConfig{
@Bean
public HelloWorld helloWorld(){
return new HelloWorld();
}
}
This is my pom.xml
这是我的 pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.test</groupId>
<artifactId>SpringMaven2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>SpringMaven2</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>4.3.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.3.3.RELEASE</version>
</dependency>
</dependencies>
</project>
I am running the following command in CMD to run the application: java -cp {nameofresultjarfile} com.test.SpringMaven2.App
我在 CMD 中运行以下命令来运行应用程序：java -cp {nameofresultjarfile} com.test.SpringMaven2.App
But getting the error messsage above
但是得到上面的错误信息
Any advice?
有什么建议吗？
Thanks
谢谢
采纳答案by jaysee
Your pom.xmlcreates a jar file which contains only the classes defined in your project. But all the other dependencies (spring-core, spring-context-support) which are required by your application aren't included.
您将pom.xml创建一个 jar 文件，其中仅包含您项目中定义的类。但不包括您的应用程序所需的所有其他依赖项（spring-core、spring-context-support）。
If your application is started within eclipse, eclipse integrates these required jar files to the classpath of the application and so it is able to run.
If your application is started from CMD the spring classes can't be found in the classpath and you get a java.lang.NoClassDefFoundError.
如果您的应用程序是在 eclipse 中启动的，eclipse 会将这些所需的 jar 文件集成到应用程序的类路径中，因此它能够运行。
如果您的应用程序是从 CMD 启动的，则在类路径中找不到 spring 类，并且您会得到一个java.lang.NoClassDefFoundError.
It's possible to name all the required jars manually when the application is started from CMD (classpath), but is much easier to created a so called self contained jar file, which has all of them already included. This can be done using maven-assembly-plugin.
当应用程序从 CMD（类路径）启动时，可以手动命名所有需要的 jar，但创建一个所谓的自包含 jar 文件要容易得多，其中已经包含了所有这些。这可以使用maven-assembly-plugin来完成。
An example how to create a self contained jar file can be found here.
可以在此处找到如何创建自包含 jar 文件的示例。
The application in a self contained jar can be started now from CMD:
java -jar name_of_your_project-jar-with-dependencies.jar
现在可以从 CMD 启动自包含 jar 中的应用程序：
java -jar name_of_your_project-jar-with-dependencies.jar
回答by Abhishek Galoda
I was getting the same error when running from Intellij as a main class (In Spring Boot project)
从 Intellij 作为主类运行时，我遇到了同样的错误（在 Spring Boot 项目中）
After opening Module settings, In the Deopendencies tab I saw that for spring-context for some reason the scope was provided, changing to compile/ even removing the scope fixed the issue for for me
打开模块设置后，在 Deopendencies 选项卡中，我看到由于某种原因提供了 spring-context 范围，更改为编译/甚至删除范围为我解决了问题
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>## Put your desired version here ##</version>
</dependency>
