我在linux下输入 java -jar pb_keygen.jar 出现以下信息 我不明白 请各位大侠帮忙说明一下
java.lang.NoClassDefFoundError: nl.invisible.keygen.gui.MainWindow
at java.lang.Class.initializeClass(libgcj.so.90)
at nl.invisible.keygen.gui.MainApp.startup(MainApp.java:19)
at org.jdesktop.application.Application$1.run(Application.java:171)
at java.awt.event.InvocationEvent.dispatch(libgcj.so.90)
at java.awt.EventQueue.dispatchEvent(libgcj.so.90)
at java.awt.EventDispatchThread.run(libgcj.so.90)
Caused by: java.lang.ClassNotFoundException: javax.swing.GroupLayout not found in gnu.gcj.runtime.SystemClassLoader{urls=[file:pb.jar], parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
at java.net.URLClassLoader.findClass(libgcj.so.90)
at gnu.gcj.runtime.SystemClassLoader.findClass(libgcj.so.90)
at java.lang.ClassLoader.loadClass(libgcj.so.90)
at java.lang.ClassLoader.loadClass(libgcj.so.90)
at java.lang.Class.forName(libgcj.so.90)
at java.lang.Class.initializeClass(libgcj.so.90)