java.lang.NoClassDefFoundError：sun / swing / plaf / synth / SynthUI
我正在使用Seaglass Look and Feel来获取我的Java Swings代码。 但我一直收到这个错误。
Exception in thread "main" java.lang.NoClassDefFoundError: sun/swing/plaf/synth/SynthUI at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:800) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) at java.net.URLClassLoader.access$100(URLClassLoader.java:71) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:278) at javax.swing.SwingUtilities.loadSystemClass(SwingUtilities.java:1873) at javax.swing.UIDefaults.getUIClass(UIDefaults.java:686) at javax.swing.UIDefaults.getUI(UIDefaults.java:758) at javax.swing.UIManager.getUI(UIManager.java:1013) at javax.swing.JRootPane.updateUI(JRootPane.java:483) at javax.swing.SwingUtilities.updateComponentTreeUI0(SwingUtilities.java:1230) at javax.swing.SwingUtilities.updateComponentTreeUI0(SwingUtilities.java:1245) at javax.swing.SwingUtilities.updateComponentTreeUI(SwingUtilities.java:1221) at jsupport.lookandfeel.LookAndFeel.changeLookandFeel(LookAndFeel.java:246) at jsupport.lookandfeel.LookAndFeel.(LookAndFeel.java:22) at jsupport.lookandfeel.Main.main(Main.java:11) Caused by: java.lang.ClassNotFoundException: sun.swing.plaf.synth.SynthUI at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ... 25 more 我做了一些研究，发现Seaglass不能使用Java 7（我当前的版本），因此问题。 但我正在寻找一种方法使其工作，或者如果任何人有任何与Java 7版本完美协作的演示，它将非常有用。
我的代码：
private void changeLookandFeel() { try { UIManager.removeAuxiliaryLookAndFeel(UIManager.getLookAndFeel()); SyntheticaLookAndFeel.setWindowsDecorated(false); UIManager.setLookAndFeel(UIMANAGER_STRING); UIManager.setLookAndFeel("de.javasoft.plaf.synthetica.SyntheticaBlueIceLookAndFeel"); for (int i = 0; i < LookAndFeel.getFrames().length; ++i) { SwingUtilities.updateComponentTreeUI(LookAndFeel.getFrames()[i]); SwingUtilities.updateComponentTreeUI(this); } SwingUtilities.updateComponentTreeUI(this); } catch (Exception ex) { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); UIManager.setLookAndFeel("de.javasoft.plaf.synthetica.SyntheticaBlackEyeLookAndFeel"); } catch (Exception e) { e.printStackTrace(); } }
我正在使用的jar子 
测试兼容性的最佳方法是检查代码是否与Java 6一起使用（如果您使用任何IDE，如Intellij的eclipse，则可以选择使用较低的Java版本编译文件）。
从错误看来，在运行时它似乎无法找到Class或它所在的路径。 您可以尝试使用java -cp来指定路径。
@Anuja U点击此链接
链接
package jsupport.lookandfeel; import de.javasoft.plaf.synthetica.SyntheticaLookAndFeel; import java.awt.Color; import javax.swing.SwingUtilities; import javax.swing.UIManager; public class LookAndFeel extends javax.swing.JFrame { public static Color FormColor = new Color(140,205,250); public static Color lblFontColor = new Color(0,0,0); public static String UIMANAGER_STRING = "de.javasoft.plaf.synthetica.SyntheticaSkyMetallicLookAndFeel"; public LookAndFeel() { changeLookandFeel(); initComponents(); } @SuppressWarnings("unchecked") // //GEN-BEGIN:initComponents private void initComponents() { pnl_main = new javax.swing.JPanel(); jButton1 = new javax.swing.JButton(); jComboBox1 = new javax.swing.JComboBox(); jCheckBox1 = new javax.swing.JCheckBox(); jTextField1 = new javax.swing.JTextField(); jScrollPane1 = new javax.swing.JScrollPane(); jTextArea1 = new javax.swing.JTextArea(); jLabel1 = new javax.swing.JLabel(); jRadioButton1 = new javax.swing.JRadioButton(); jButton2 = new javax.swing.JButton(); jMenuBar1 = new javax.swing.JMenuBar(); jMenu1 = new javax.swing.JMenu(); jMenu2 = new javax.swing.JMenu(); jMenuItem1 = new javax.swing.JMenuItem(); jMenuItem2 = new javax.swing.JMenuItem(); jMenuItem3 = new javax.swing.JMenuItem(); jMenuItem4 = new javax.swing.JMenuItem(); jMenuItem5 = new javax.swing.JMenuItem(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); setUndecorated(true); pnl_main.setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout()); jButton1.setText("Button"); pnl_main.add(jButton1, new org.netbeans.lib.awtextra.AbsoluteConstraints(60, 70, 70, 30)); jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" })); pnl_main.add(jComboBox1, new org.netbeans.lib.awtextra.AbsoluteConstraints(160, 80, 110, -1)); jCheckBox1.setText("jCheckBox1"); pnl_main.add(jCheckBox1, new org.netbeans.lib.awtextra.AbsoluteConstraints(310, 80, 90, -1)); jTextField1.setText("jTextField1"); pnl_main.add(jTextField1, new org.netbeans.lib.awtextra.AbsoluteConstraints(60, 140, 140, -1)); jTextArea1.setColumns(20); jTextArea1.setRows(5); jScrollPane1.setViewportView(jTextArea1); pnl_main.add(jScrollPane1, new org.netbeans.lib.awtextra.AbsoluteConstraints(220, 140, 180, 60)); jLabel1.setFont(new java.awt.Font("Tahoma", 1, 14)); jLabel1.setText("Look And Feel"); pnl_main.add(jLabel1, new org.netbeans.lib.awtextra.AbsoluteConstraints(30, 20, 130, 20)); jRadioButton1.setText("jRadioButton1"); pnl_main.add(jRadioButton1, new org.netbeans.lib.awtextra.AbsoluteConstraints(310, 40, -1, -1)); jButton2.setText("Exit"); jButton2.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton2ActionPerformed(evt); } }); pnl_main.add(jButton2, new org.netbeans.lib.awtextra.AbsoluteConstraints(60, 220, 90, 30)); jMenuBar1.setMinimumSize(new java.awt.Dimension(60, 30)); jMenuBar1.setPreferredSize(new java.awt.Dimension(60, 30)); jMenu1.setText("File"); jMenuBar1.add(jMenu1); jMenu2.setText("Look And Feel"); jMenuItem1.setFont(new java.awt.Font("Tahoma", 0, 12)); jMenuItem1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/Issue.png"))); // NOI18N jMenuItem1.setText("Skye Metal"); jMenuItem1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jMenuItem1ActionPerformed(evt); } }); jMenu2.add(jMenuItem1); jMenuItem2.setFont(new java.awt.Font("Tahoma", 0, 12)); jMenuItem2.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/ItemMaster.png"))); // NOI18N jMenuItem2.setText("Blue Moon"); jMenuItem2.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jMenuItem2ActionPerformed(evt); } }); jMenu2.add(jMenuItem2); jMenuItem3.setFont(new java.awt.Font("Tahoma", 0, 12)); jMenuItem3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/ItemType.png"))); // NOI18N jMenuItem3.setText("Classy"); jMenuItem3.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jMenuItem3ActionPerformed(evt); } }); jMenu2.add(jMenuItem3); jMenuItem4.setFont(new java.awt.Font("Tahoma", 0, 12)); jMenuItem4.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/look.png"))); // NOI18N jMenuItem4.setText("White Vision"); jMenuItem4.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jMenuItem4ActionPerformed(evt); } }); jMenu2.add(jMenuItem4); jMenuItem5.setFont(new java.awt.Font("Tahoma", 0, 12)); jMenuItem5.setIcon(new javax.swing.ImageIcon(getClass().getResource("/images/inv1.png"))); // NOI18N jMenuItem5.setText("System Look&Feel"); jMenuItem5.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jMenuItem5ActionPerformed(evt); } }); jMenu2.add(jMenuItem5); jMenuBar1.add(jMenu2); setJMenuBar(jMenuBar1); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(pnl_main, javax.swing.GroupLayout.PREFERRED_SIZE, 457, javax.swing.GroupLayout.PREFERRED_SIZE) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(pnl_main, javax.swing.GroupLayout.DEFAULT_SIZE, 270, Short.MAX_VALUE) ); java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize(); setBounds((screenSize.width-457)/2, (screenSize.height-300)/2, 457, 300); }// //GEN-END:initComponents private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem1ActionPerformed UIMANAGER_STRING = "de.javasoft.plaf.synthetica.SyntheticaSkyMetallicLookAndFeel"; changeLookandFeel(); }//GEN-LAST:event_jMenuItem1ActionPerformed private void jMenuItem2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem2ActionPerformed UIMANAGER_STRING = "de.javasoft.plaf.synthetica.SyntheticaBlueMoonLookAndFeel"; changeLookandFeel(); }//GEN-LAST:event_jMenuItem2ActionPerformed private void jMenuItem3ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem3ActionPerformed UIMANAGER_STRING = "de.javasoft.plaf.synthetica.SyntheticaBlueIceLookAndFeel"; changeLookandFeel(); }//GEN-LAST:event_jMenuItem3ActionPerformed private void jMenuItem4ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem4ActionPerformed UIMANAGER_STRING = "de.javasoft.plaf.synthetica.SyntheticaWhiteVisionLookAndFeel"; changeLookandFeel(); }//GEN-LAST:event_jMenuItem4ActionPerformed private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton2ActionPerformed System.exit(0); }//GEN-LAST:event_jButton2ActionPerformed private void jMenuItem5ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem5ActionPerformed try { UIManager.removeAuxiliaryLookAndFeel(UIManager.getLookAndFeel()); UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); for (int i = 0; i < LookAndFeel.getFrames().length; ++i) { SwingUtilities.updateComponentTreeUI(LookAndFeel.getFrames()[i]); } } catch (Exception ex) { ex.printStackTrace(); } }//GEN-LAST:event_jMenuItem5ActionPerformed /** * @param args the command line arguments */ // public static void main(String args[]) { // java.awt.EventQueue.invokeLater(new Runnable() { // public void run() { // new LookAndFeel().setVisible(true); // } // }); // } // Variables declaration - do not modify//GEN-BEGIN:variables private javax.swing.JButton jButton1; private javax.swing.JButton jButton2; private javax.swing.JCheckBox jCheckBox1; private javax.swing.JComboBox jComboBox1; private javax.swing.JLabel jLabel1; private javax.swing.JMenu jMenu1; private javax.swing.JMenu jMenu2; private javax.swing.JMenuBar jMenuBar1; private javax.swing.JMenuItem jMenuItem1; private javax.swing.JMenuItem jMenuItem2; private javax.swing.JMenuItem jMenuItem3; private javax.swing.JMenuItem jMenuItem4; private javax.swing.JMenuItem jMenuItem5; private javax.swing.JRadioButton jRadioButton1; private javax.swing.JScrollPane jScrollPane1; private javax.swing.JTextArea jTextArea1; private javax.swing.JTextField jTextField1; private javax.swing.JPanel pnl_main; // End of variables declaration//GEN-END:variables private void changeLookandFeel() { try { UIManager.removeAuxiliaryLookAndFeel(UIManager.getLookAndFeel()); SyntheticaLookAndFeel.setWindowsDecorated(false); UIManager.setLookAndFeel(UIMANAGER_STRING); // for (int i = 0; i < LookAndFeel.getFrames().length; ++i) { // SwingUtilities.updateComponentTreeUI(LookAndFeel.getFrames()[i]); // SwingUtilities.updateComponentTreeUI(this); // } SwingUtilities.updateComponentTreeUI(this); } catch (Exception ex) { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (Exception e) { e.printStackTrace(); } } } }
MainClass
package jsupport.lookandfeel; public class Main { public static void main(String[] args) { new LookAndFeel().setVisible(true); } }