Unable to find required classes (javax.activation.DataHandler and javax.mail.internet.MimeMultipart)
Unable to find required classes (javax.activation.DataHandler and javax.mail.internet.MimeMultipart). Attachment support is disabled
事实上这个问题很简单，我也是搜索了很长时间。但因为这个只是警告，不是出错。因此，只要新添一个log4j，便可以设定提示的警告状态。
错误原因：需要mail.jar和activation.jar。
一般的解决办法是：
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
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%
这个办法只会出现新的问题，如no manifiest section for signature file entry /DataContentHandlerFactory，因为需要signture file
但其实这个警告是可以忽略的，方法很简单
建立一个新 log4j.properties在JAR的首目录下，log4j.rootLogger=ERROR, Console
====== log4j.properties ====
log4j.rootLogger=ERROR, Console
log4j.category.org.apache.struts=INFO
log4j.category.org.hibernate=INFO
log4j.category.tools=DEBUG,
log4j.additivity.tools=true
log4j.category.ocd=DEBUG
log4j.additivity.ocd=true
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
====== end =====
====== build.xml ====
<target name="makejarSOAP" depends="cleanSOAP" description="Build soap jar">
<jar destfile="${build.dir}/${soap.prefixe}.jar" basedir="${classes.dir}">
<exclude name="test/**" />
<zipfileset src="${webapp.dir}/WEB-INF/lib/axis.jar" />
<zipfileset src="${webapp.dir}/WEB-INF/lib/jargs.jar" />
<zipfileset src="${webapp.dir}/WEB-INF/lib/jaxrpc.jar" />
<zipfileset src="${webapp.dir}/WEB-INF/lib/saaj.jar" />
<zipfileset src="${webapp.dir}/WEB-INF/lib/wsdl4j-1.5.1.jar" />
<zipfileset src="${webapp.dir}/WEB-INF/lib/commons-logging.jar" />
<zipfileset src="${webapp.dir}/WEB-INF/lib/commons-discovery-0.2.jar" /><zipfileset src="${webapp.dir}/WEB-INF/lib/log4j-1.2.9.jar" />
<manifest>
<attribute name="Main-Class" value="ocd.wsclient.WsClient"/>
</manifest>
</jar>
<javac classpath="${soap.classes.dir}" srcdir="${soap.src.dir}" nowarn="true">
<include name="${webapp.dir}/WEB-INF/lib/jargs.jar"/>
</javac>
</target>
====== end =====
警告就会不再显示了
来自：http://blog.csdn.net/chastel/article/details/2084076
=========================================================
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
来自：http://www.cppblog.com/wform/archive/2006/04/27/mail_activation_jar.html