求解关于jar包的有关问题

求解关于jar包的问题
我写了个程序，eclipse中运行无错，打成jar包运行也无措，但是放到tomcat中，用javawebstart运行，报错下面是错误原因，求高手告知原因谢谢！

其中MANIFEST.MF中的格式如下
Manifest-Version: 1.0
Rsrc-Class-Path: ./ jxl.jar
Class-Path: .
Rsrc-Main-Class: com.maxwell.main.Main
Main-Class: org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader

Name: org/eclipse/jdt/internal/jarinjarloader/RsrcURLStreamHandlerFact 
 
 ory.class
SHA1-Digest: F0QJkZOmudrrdVoEKYjtuD8NL/U=

Name: org/eclipse/jdt/internal/jarinjarloader/JarRsrcLoader.class
SHA1-Digest: dfEYKwKuAs2FAaEfLAcReOMSrJI=

Name: com/maxwell/main/OutPutExcel.class
SHA1-Digest: edu6FHuD+ftrh/BlP0id5QxvP1Q=

Name: org/eclipse/jdt/internal/jarinjarloader/JarRsrcLoader$ManifestIn
 fo.class
SHA1-Digest: mUIFJAHXhz6AONcnvbPvP588LBE=

Name: com/maxwell/main/Main.class
SHA1-Digest: q6eM24qKcx0HNomwMPZi42Ke5gA=

Name: com/maxwell/main/Resources.class
SHA1-Digest: VlSe+z0aYSDXmQ3t7VAtAJXBtNw=

Name: jxl.jar
SHA1-Digest: w3UmUceIf+pUC+Kdv/4x82riiJQ=

Name: org/eclipse/jdt/internal/jarinjarloader/JIJConstants.class
SHA1-Digest: ohmPkG2z0utv9xOeivSU9wFaLeI=

Name: org/eclipse/jdt/internal/jarinjarloader/RsrcURLStreamHandler.cla
 ss
SHA1-Digest: ePtsxI/5hHRJpNNXkpd8gWPXwR8=

Name: org/eclipse/jdt/internal/jarinjarloader/RsrcURLConnection.class
SHA1-Digest: 1jOpkzeF/S9tXQx+L3EDoq9BvAA=
请问是什么原因？                                Java?Web?Start              
[解决办法]
看下你main方法 73行 什么代码
[解决办法]
明显没有把jar包加到classpath下。
[解决办法]
缺少jar包应该是不错，lz将jxl.write.WritableCell 相关jar包放到tomcat的lib中试试。