使用Apache Commons VFS時，爲什麼我的applet中會出現NoClassDefFoundError？

Question

誰能幫我做這個錯誤消息的意義嗎？ 我寫了一個拖放小程序，它通過SFTP上傳到遠程服務器。它的工作原理，當我從我的本地計算機上運行的小程序，但一旦我把它放到網上，我收到以下錯誤。

的原因是什麼，我該怎麼辦？

Exception in thread "AWT-EventQueue-2" java.lang.NoClassDefFoundError: org/apache/commons/vfs/FileSystemException 
    at com.zehon.sftp.SFTP.getSFTPClient(SFTP.java:20) 
    at com.zehon.sftp.SFTP.sendFile(SFTP.java:50) 
    at Combined.uploadFunction(Combined.java:103) 
    at NewDrag.uploadButtonMouseClicked(NewDrag.java:187) 
    at NewDrag.access$400(NewDrag.java:35) 
    at NewDrag$5.mouseClicked(NewDrag.java:137) 
    at java.awt.AWTEventMulticaster.mouseClicked(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.Component.dispatchEvent(Unknown Source) 
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source) 
    at java.awt.EventQueue.access$000(Unknown Source) 
    at java.awt.EventQueue$1.run(Unknown Source) 
    at java.awt.EventQueue$1.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$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.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: org.apache.commons.vfs.FileSystemException 
    at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source) 
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source) 
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source) 
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source) 
    at java.lang.ClassLoader.loadClass(Unknown Source) 
    ... 37 more 

Answer 1

看起來你還沒有在你的applet中嵌入commons-vfs作爲依賴。

如果您正在使用maven有關如何與Maven做建築物確認How to deploy Applet with dependencies jar using maven and sign it?尋求幫助。