尝试使用 OSHI 中的 get() 方法时抛出 NoClassDefFoundError

Question

我正在使用 OSHI（操作系统硬件信息），一个 java 项目，旨在获取系统信息。

我正在使用 NetBeans IDE 并将每个依赖项的单独 jar 文件添加到项目库中。但是每当我尝试使用任何 get() 方法时，都会抛出一个 NoClassDefFoundError 。例如，这是我尝试获取 OS 信息的代码（我已经添加了所有必要的导入语句）；

SystemInfo si=new SystemInfo();
HardwareAbstractionLayer hal = si.getHardware();
Sensors sense=hal.getSensors();
System.out.println("Cpu Temperature" + sense.getCpuTemperature());

当我运行这段代码时，它显示以下错误；

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: com/sun/jna/platform/win32/Variant$VARIANT
at oshi.hardware.platform.windows.WindowsSensors.getCpuTemperature(WindowsSensors.java:54)
at pandorastress.PandoraUI.b1ActionPerformed(PandoraUI.java:168)
at pandorastress.PandoraUI.access[=11=]0(PandoraUI.java:55)
at pandorastress.PandoraUI.actionPerformed(PandoraUI.java:83)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
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.Component.processMouseEvent(Component.java:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access0(EventQueue.java:97)
at java.awt.EventQueue.run(EventQueue.java:709)
at java.awt.EventQueue.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue.run(EventQueue.java:731)
at java.awt.EventQueue.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.lang.ClassNotFoundException: 
com.sun.jna.platform.win32.Variant$VARIANT
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 40 more

有什么办法可以纠正这个问题吗？

Answer 1

基于，您需要Java Native Access (JNA) 库和一个实现 slf4j 的日志系统。

要添加 JNA 支持，您可以从此 link 下载合适的（基于您的系统）包。

此外，您可以尝试直接通过downloading the jar添加JNA-bundle并将其添加到您的项目中。

否则，您可以将您的项目更改为maven 项目，然后使用maven 来构建您的项目。这将下载所有依赖项。

尝试使用 OSHI 中的 get() 方法时抛出 NoClassDefFoundError

NoClassDefFoundError thrown when trying to use get() methods from OSHI

java

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