Question

java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory

刚用spring，经常出错，出错如下，源代码如下，实在是找不出错误了，请教，jdk环境变量设置没错，甚至我吧spring.jar加进了classpath中，结果还是这个错：
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at org.springframework.context.support.AbstractApplicationContext.<init>(AbstractApplicationContext.java:130)
at org.springframework.context.support.AbstractApplicationContext.<init>(AbstractApplicationContext.java:158)
at org.springframework.context.support.AbstractRefreshableApplicationContext.<init>(AbstractRefreshableApplicationContext.java:67)
at org.springframework.context.support.AbstractXmlApplicationContext.<init>(AbstractXmlApplicationContext.java:49)
at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:86)
at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:74)
at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:65)
at hello.spring.TestHelloWorld.main(TestHelloWorld.java:8)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
... 8 more

package hello.spring;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

public class TestHelloWorld {
public static void main(String args[]){
ApplicationContext ctx = new FileSystemXmlApplicationContext("src/myspring.xml");
HelloWorld hw = (HelloWorld)ctx.getBean("myBean");
hw.show();
}
}

package hello.spring;

public class HelloWorld {
private String hello;

public String getHello() {
return hello;
}

public void setHello(String hello) {
this.hello = hello;
}

public void show(){
System.out.println("--message--"+getHello());
}

}

<?xml version="1.0" encoding="gbk"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="myBean" class="hello.spring.HelloWorld">
<property name="hello">
<value>Hello Spring!</value>
</property>
</bean>
</beans>

Answer 1

at hello.spring.TestHelloWorld.main(TestHelloWorld.java:8)
你在这个第八行调用了一个类吧?
那个类没有找到,你看看你是否有这个类,找不到这个类.原因是:
Caused by: java.lang.ClassNotFoundException:org.apache.commons.logging.LogFactory
在代码中你写了:
ApplicationContext ctx = new FileSystemXmlApplicationContext("src/myspring.xml");
你没有引入commons-logging.jar包,当然找不到那个类了

Answer 2

个人建议好像你用的那个apache的包是用来开发web服务器端程序时用的。是不能在main函数中利用的。
服务器端开发和main函数是完全不同的方式。
在main函数里不能直接用这个包里的类，需要你自己改动。

（我是初学者说的不对的地方多多包涵。O(^_^)O~)

Answer 3

把 commons-logging.jar 和log4j-1.2.14.jar放到build path里

Answer 4

我也在关注JAVA

Answer 5

Spring正在学习当中，表示一下关注吧....