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我有一個在Eclipse中運行良好的Java項目,但是當我將它導出到可運行Jar文件(選中「需要將包裝庫導入jar」)時,出現以下錯誤:導出可運行jar後無法找到資源
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoa
der.java:58)
Caused by: java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(Unknown Source)
at cib.cad.kernel.cmds.StartGui.doCmd(StartGui.java:94)
at cib.util.cmd.CmdMgr.doCmd(CmdMgr.java:91)
at cib.cad.kernel.Kernel.begin(Kernel.java:1058)
at cib.cad.Stylemaster.main(Stylemaster.java:70)
... 5 more
Exception in thread "Thread-1" java.lang.NullPointerException
at cib.cad.kernel.Kernel.setPreferredLocation(Kernel.java:2615)
at cib.cad.view.ErrorMessagePrintStream$MsgThread._showMessageDialog(Err
orMessagePrintStream.java:303)
at cib.cad.view.ErrorMessagePrintStream$MsgThread.run(ErrorMessagePrintS
tream.java:268)
而在StartGui.doCmd(StartGui.java:94)的代碼如下所示:
try {
ClassLoader cl = StartGui.class.getClassLoader();
URL url = cl.getResource("cib/cad/img/StyleIcon.jpg");
Image icon = new ImageIcon(url).getImage(); //<-- Line 94
frame.setIconImage(icon);
}
catch (IllegalArgumentException e) {
}
我假設這個空指針異常所引起,因爲它無法找到圖標,但我不不完全理解爲什麼它會在日蝕中完美運行。
在此先感謝善良的人。