Unable to find required classes (javax.activation.DataHandler and javax.mail.internet.MimeMultipart)

在接触WebService时值得收藏的一篇文章：

在调试Axis1.4访问WebService服务时，出现以下错误：

Unable to find required classes (javax.activation.DataHandler and javax.mail.internet.MimeMultipart)

有错误找到错误原因以及发现值得收藏的一篇文章，方便自己查找。

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错误原因：
需要mail.jar和activation.jar。

Solution:
Web Services Required Jars Download Instructions 
http://www.eclipse.org/webtools/wst/components/ws/download_instructions_for_jars.html

解决办法：
1) 下载javamail和jaf，解压出mail.jar和activation.jar
http://java.sun.com/products/javamail/downloads/index.html
http://java.sun.com/products/javabeans/glasgow/jaf.html#download
或者我提供了一个rar包：包含mail.jar action.jar
download：mail.jar and activation.jar
2) 把mail.jar和activation.jar放到%AXIS_HOME%/WEB-INF/lib目录下

3) 将.jar文件添加到%CLASSPATH%

说明：
这个是可以忽略的。不过以后构建web services都要用到的，还是添加上的好。
参考：http://www.ogsadai.org.uk/documentation/ogsadai-wsi-2.1/doc/wsi/FAQ.html
This is a warning message that can safely be ignored. It is displayed when Axis has been deployed without an optional JAR. An optional JAR is one that allows Axis to support a particular piece of functionalty but is not required for general use. Please refer to the Axis documentation for more details.

备注：
一篇很好的jars下载指南：Web Services Required Jars Download Instructions
Axis指南：Guide to building Axis