Apache HttpClient抛出NoClassDefFoundError [英] Apache HttpClient throws a NoClassDefFoundError

问题描述

我有：ubuntu-9.10-desktop-amd64 + NetBeans6.7.1

I have: ubuntu-9.10-desktop-amd64 + NetBeans6.7.1

1. 我刚刚下载了Commons HttpClient 3.1（legacy）来自 http://hc.apache.org/downloads.cgi 。


2. 我使用IDE NetBeans创建了新的应用程序。


3. 我专注于项目 - >库 - >添加JAR /文件夹，这里添加了commons-httpclient- 3.1.jar


4. 到现在为止，我可以写import org.apache.commons.httpclient。*;这没关系。



5. 但是，如果我尝试添加任何语句，包括以下内容：

1. I just downloaded "Commons HttpClient 3.1 (legacy)" from http://hc.apache.org/downloads.cgi .
2. I created new application with IDE NetBeans.
3. I focused on Projects -> Libraries -> Add JAR/Folder and here added commons-httpclient-3.1.jar
4. By now, I can write "import org.apache.commons.httpclient.*;" This is OK.

5. But, if I try to add any statement included something like this:

public static void main(String[] args) {
    HttpClient client = new HttpClient();
}

汇编得很好。

It is compiled well.

但是当我运行这个项目时，我收到以下错误：

But when I run this project, I receive the following errors:

***Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
    at org.apache.commons.httpclient.HttpClient.<clinit>(HttpClient.java:66)
    at SimplestAppl.Main.main(Main.java:22)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
    at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:319)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:264)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332)
    ... 2 more
Java Result: 1***

出了什么问题？

我试图下载HttpClient 4.0（GA）。但结果是一样的。

I tried to download "HttpClient 4.0 (GA)". But the result was same.

推荐答案

您所遇到的只是一个缺失的依赖。 Java开发人员习惯于自己收集依赖项，尤其是。当涉及到日志框架时。
下载commons-logging并将其添加到类路径中。与httpclient所需的所有其他依赖项一样。

What you are experiencing is just a missing dependency. Java developers are used to gather their dependencies themselves, esp. when it comes to logging frameworks. Download commons-logging and add it to your classpath. Do as well with all other dependencies required by httpclient.

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