Java JNA 本机库调用 NoClassDefFoundError

Question

我想使用 Java 将文件放入 Windows 的回收站。以便用户能够恢复它。

因此我使用库 JNA from Github (jna-platform-4.2.2.jar) 来访问本机 Windows 函数。

我的代码：

public static boolean moveToTrashBin(File file){

    FileUtils fileUtils = FileUtils.getInstance();

    if(fileUtils.hasTrash()){   // returns true
        try{
            fileUtils.moveToTrash(new File[]{file});   // throws Exception
            return true;
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    return false;
}

没有编译时错误，但是当我尝试运行它时，行 fileUtils.moveToTrash(..) 抛出以下 NoClassDefFoundError 和一个ClassNotFoundExeption:

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: com/sun/jna/win32/StdCallLibrary at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:760) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:455) at java.net.URLClassLoader.access0(URLClassLoader.java:73) at java.net.URLClassLoader.run(URLClassLoader.java:367) at java.net.URLClassLoader.run(URLClassLoader.java:361) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:360) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:760) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:455) at java.net.URLClassLoader.access0(URLClassLoader.java:73) at java.net.URLClassLoader.run(URLClassLoader.java:367) at java.net.URLClassLoader.run(URLClassLoader.java:361) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:360) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at com.sun.jna.platform.win32.W32FileUtils.moveToTrash(W32FileUtils.java:28) at DropboxFix.Gui.Tools.moveToTrashBin(Tools.java:21) at DropboxFix.Gui.Gui.btnDeleteFoundOnClick(Gui.java:208) at DropboxFix.Gui.Gui.access00(Gui.java:34) at DropboxFix.Gui.Gui.actionPerformed(Gui.java:357) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289) at java.awt.Component.processMouseEvent(Component.java:6525) at javax.swing.JComponent.processMouseEvent(JComponent.java:3322) at java.awt.Component.processEvent(Component.java:6290) at java.awt.Container.processEvent(Container.java:2234) at java.awt.Component.dispatchEventImpl(Component.java:4881) at java.awt.Container.dispatchEventImpl(Container.java:2292) at java.awt.Component.dispatchEvent(Component.java:4703) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462) at java.awt.Container.dispatchEventImpl(Container.java:2278) at java.awt.Window.dispatchEventImpl(Window.java:2739) at java.awt.Component.dispatchEvent(Component.java:4703) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:751) at java.awt.EventQueue.access0(EventQueue.java:97) at java.awt.EventQueue.run(EventQueue.java:702) at java.awt.EventQueue.run(EventQueue.java:696) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain.doIntersectionPrivilege(ProtectionDomain.java:75) at java.security.ProtectionDomain.doIntersectionPrivilege(ProtectionDomain.java:86) at java.awt.EventQueue.run(EventQueue.java:724) at java.awt.EventQueue.run(EventQueue.java:722) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain.doIntersectionPrivilege(ProtectionDomain.java:75) at java.awt.EventQueue.dispatchEvent(EventQueue.java:721) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) Caused by: java.lang.ClassNotFoundException: com.sun.jna.win32.StdCallLibrary at java.net.URLClassLoader.run(URLClassLoader.java:372) at java.net.URLClassLoader.run(URLClassLoader.java:361) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:360) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 66 more

我将 IntelliJ 用作 IDE 并在 "Project Structure -> Libraries -> Add" 下添加了库。

我该如何解决这个问题？

Answer 1

我发现了错误，只需要将网站上的第二个库 jna-4.2.2.jar 添加到我的项目中..

我现在工作了！

Java JNA 本机库调用 NoClassDefFoundError

Java JNA Native Library Call NoClassDefFoundError

java

java-native-interface

native

jna

classnotfoundexception