我对Spring和maven都很新。我收到这个错误,我会告诉我到目前为止做了什么
我已经更新了spring-core和spring-context依赖项,之后我已经完成了mvn clean install并且没有问题。我做了mvn eclipse:eclipse之后它也很好。我使用mvn clean编译并且也通过了。我已经检查了.m2文件夹(在MacOS上),是的spring-core就在那里。然而,在运行我的项目时,这个运行时异常即将来临;我已经尝试过在StackOverflow上给出的其他几个解决方案但没有一个能够工作。 *请不要downvote;我想要非常诚实地学习一些东西;自从过去13个小时以来一直在编码。
Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/core/io/Resource
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: org.springframework.core.io.Resource
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 7 more
这是我的POM文件。
<?xml version="1.0" encoding="UTF-8"?>
<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>Spring_1</groupId>
<artifactId>SpringCIList</artifactId>
<version>1.0-SNAPSHOT</version>
<name>SpringCIList</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.2.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.2.6.RELEASE</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.0.0</version>
</plugin>
<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.20.1</version>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
从我这边快速怀疑,这可能是(豆-2.5 xsd)
<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-2.5.xsd">
是问题根源?
编辑1导致异常发生的精确运行命令
.
Rishis-MBP:SpringCIList rishiprakash$ cd target/classes/
Rishis-MBP:classes rishiprakash$ ls
Spring_1 spring-module.xml
Rishis-MBP:classes rishiprakash$ java Spring_1.App
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/core/io/Resource
at java.lang.Class.getDeclaredMethods0(Native Method)......
App.java
package Spring_1;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
public class App
{
public static void main( String[] args )
{
Resource r = new ClassPathResource("spring-module.xml");
BeanFactory factory = new XmlBeanFactory(r);
Employee e = (Employee)factory.getBean("emp");
System.out.println( "Hello World!" );
e.displayInfo();
}
}
Employee.java
package Spring_1;
class Employee{
private String name;
String getName(){
return this.name;
}
void setName(String name){
this.name = name;
}
void displayInfo(){
System.out.println("name of employee is"+this.name);
}
}
弹簧module.xml
<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-2.5.xsd">
<bean id="emp" class="Spring_1.Employee">
<property name="name" value="Rishi"></property>
</bean>
</beans>
导入到eclipse(使用m2e插件)时的相同项目正在运行。
答案 0 :(得分:2)
您正在尝试仅使用.class文件运行整个应用程序,而忘记告诉JVM有关依赖项。
以下问题可以使用以下方法解决:mvn exec:java -Dexec.mainClass="Spring_1.App"
但是我强烈建议您从IDE(Eclipse,Idea)
答案 1 :(得分:1)
我认为通过以这种方式运行您的应用程序,类路径不包含所有依赖项。
尝试以下方法:
mvn clean package
(这应该在目标/文件夹中创建一个jar文件)jara -jar your_app_name.jar
答案 2 :(得分:0)
Release is spring-web仅在spring.core 4.2版之后可用