java.lang.NoClassDefFoundError：sun / swing / plaf / synth / SynthUI [英] java.lang.NoClassDefFoundError: sun/swing/plaf/synth/SynthUI

问题描述

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。

I am using Seaglass Look and Feel for my Java Swings code. But I keep getting this error.

    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.<init>(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不能与Java 7（我目前的版本）一起工作，因此也是问题。但我正在寻找一种方法使其工作，或者如果有人有任何与Java 7版本完美配合的演示，那将非常有用。

I did a bit of research and found that Seaglass does not work with Java 7 (my current version) and hence the issue. But I am looking a way to make it work or if anyone has any demo that works perfectly with Java 7 version, it would be very helpful.

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();
        }
    }

我使用的罐子
< a href =https://i.stack.imgur.com/UkkC4.png =nofollow noreferrer>

推荐答案

测试兼容性的最佳方法是检查代码是否为使用Java 6（如果您正在使用任何IDE，例如Intellij的eclipse，他们可以选择使用较低的Java版本编译文件）。

The best way to test the compatibility is to check whether the code is working with Java 6 (If you are using any IDE like eclipse of Intellij they have the option of compiling file with lower Java version).

从错误中可以看出运行时它无法找到Class或它所在的路径。您可以尝试 java -cp 来指定路径。

From the error it seems that at run-time it is not able to find the Class, or the path where it is located. You can try java -cp to specify the path.

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