I'm using OSHI (Operating System Hardware Information), a java project, intended to obtain system information.
I'm using NetBeans IDE and have added the individual jar files for each of the dependencies to the project library. But whenever I try to use any of the get() methods, a NoClassDefFoundError is thrown. For example, this is my code where I try to get the OS information (I've added all the necessary import statements);
SystemInfo si=new SystemInfo();
HardwareAbstractionLayer hal = si.getHardware();
Sensors sense=hal.getSensors();
System.out.println("Cpu Temperature" + sense.getCpuTemperature());
When I run this code, it shows the following error;
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$000(PandoraUI.java:55)
at pandorastress.PandoraUI$1.actionPerformed(PandoraUI.java:83)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$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.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$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
is there any way to rectify this?
Based on some previous answers, you need Java Native Access (JNA) library and a logging system that implements slf4j.
To add the JNA support you can download the appropriate (based on your system) bundle from this link.
Also, you can try to add the JNA-bundle directly by downloading the jar and adding it to your project.
Otherwise, you can change your project to a maven project and then use the maven to build your project. This will download all the dependencies.