为什么我会收到 NoClassDefFoundError: java/awt/Desktop？
我正在尝试使用 Swing 打开一个 URI ，但出现上述错误。
原因是什么以及如何解决？
当我在控制台中执行此操作时，一切正常，但当我在 GUI 中执行此操作时，出现此错误。 我应该说我使用Weblogic作为服务器。
代码
private static void open(URI uri) {
if (Desktop.isDesktopSupported()) {
try {
Desktop.getDesktop().browse(uri);
} catch (IOException e) { /* TODO: error handling */ }
} else { /* TODO: error handling */ }
}
堆栈跟踪：
Exception in thread "AWT-EventQueue-1" java.lang.NoClassDefFoundError: java/awt/Desktop
at be.azvub.ext.bcfidownloder.BcfiDownloadPanel.open(BcfiDownloadPanel.java:230)
at be.azvub.ext.bcfidownloder.BcfiDownloadPanel.access$000(BcfiDownloadPanel.java:37)
at be.azvub.ext.bcfidownloder.BcfiDownloadPanel$7.actionPerformed(BcfiDownloadPanel.java:147)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:5517)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3129)
at java.awt.Component.processEvent(Component.java:5282)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3984)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3819)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1791)
I'm trying to open an URI with Swing that I get above error.
What is the reason and how can I fix it?
When I do it in console everything is OK but when I do in GUI I get this error.
I should say that I use Weblogic as server.
Code
private static void open(URI uri) {
if (Desktop.isDesktopSupported()) {
try {
Desktop.getDesktop().browse(uri);
} catch (IOException e) { /* TODO: error handling */ }
} else { /* TODO: error handling */ }
}
Stack trace:
Exception in thread "AWT-EventQueue-1" java.lang.NoClassDefFoundError: java/awt/Desktop
at be.azvub.ext.bcfidownloder.BcfiDownloadPanel.open(BcfiDownloadPanel.java:230)
at be.azvub.ext.bcfidownloder.BcfiDownloadPanel.access$000(BcfiDownloadPanel.java:37)
at be.azvub.ext.bcfidownloder.BcfiDownloadPanel$7.actionPerformed(BcfiDownloadPanel.java:147)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:5517)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3129)
at java.awt.Component.processEvent(Component.java:5282)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3984)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3819)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1791)
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评论（3）
java.awt.Desktop已引入 在 Java 6 中。您很有可能在不同的 JRE 版本上运行代码。java.awt.Desktophas been introduced in Java 6. Chances are high you're running your code on different JRE versions.的文档
关于 NoClassDefFoundError 编译当前执行的类时，类定义已存在，但无法再找到该定义。
您确实发生了一些不正确的类加载。主要是由于错误的类加载器链接。
Doc on NoClassDefFoundError
The searched-for class definition existed when the currently executing class was compiled, but the definition can no longer be found.
You do have some incorrect classloading happening. Mostly due to wrong class loader chaining.
NoClassDefFoundError只能由类路径问题引起。由于
Desktop是 jre 的一部分，因此请确保您的类路径包含对 jre 库的引用。在Eclipse中，可以进入运行配置 --> 类路径并检查
更新：
正如Andrew建议的那样，您还可以检查您至少有java 1.6
NoClassDefFoundErrorcan only be caused by a classpath problem.Because
Desktopis part of jre, make sure that your classpath contains a reference to the jre library.In Eclipse, you can go to run configurations --> Classpath and check there
UPDATE:
As Andrew suggested, you can also check you have at least java 1.6