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！

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Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: jxl/write/WritableCell

	at com.maxwell.main.Main.actionPerformed(Main.java:73)

	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)

	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)

	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)

	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)

	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)

	at java.awt.Component.processMouseEvent(Unknown Source)

	at javax.swing.JComponent.processMouseEvent(Unknown Source)

	at java.awt.Component.processEvent(Unknown Source)

	at java.awt.Container.processEvent(Unknown Source)

	at java.awt.Component.dispatchEventImpl(Unknown Source)

	at java.awt.Container.dispatchEventImpl(Unknown Source)

	at java.awt.Component.dispatchEvent(Unknown Source)

	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)

	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)

	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)

	at java.awt.Container.dispatchEventImpl(Unknown Source)

	at java.awt.Window.dispatchEventImpl(Unknown Source)

	at java.awt.Component.dispatchEvent(Unknown Source)

	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)

	at java.awt.EventQueue.access$400(Unknown Source)

	at java.awt.EventQueue$2.run(Unknown Source)

	at java.awt.EventQueue$2.run(Unknown Source)

	at java.security.AccessController.doPrivileged(Native Method)

	at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)

	at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)

	at java.awt.EventQueue$3.run(Unknown Source)

	at java.awt.EventQueue$3.run(Unknown Source)

	at java.security.AccessController.doPrivileged(Native Method)

	at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)

	at java.awt.EventQueue.dispatchEvent(Unknown Source)

	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)

	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)

	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

	at java.awt.EventDispatchThread.run(Unknown Source)

Caused by: java.lang.ClassNotFoundException: jxl.write.WritableCell

	at java.net.URLClassLoader$1.run(Unknown Source)

	at java.security.AccessController.doPrivileged(Native Method)

	at java.net.URLClassLoader.findClass(Unknown Source)

	at com.sun.jnlp.JNLPClassLoader.findClass(Unknown Source)

	at java.lang.ClassLoader.loadClass(Unknown Source)

	at java.lang.ClassLoader.loadClass(Unknown Source)

	... 37 more

程序中调用了第三方jar包jxl.jar打的jar包如下格式