when open the matlab, it will appear many mistakes about Exception in thread "Startup Class Loader" in command window.

when i open it will apear:

Exception in thread "Startup Class Loader": java.lang.NoClassDefFoundError: Could not initialize class com.mathworks.instutil.InstutilResourceKeys

at com.mathworks.mlwidgets.help.DocCenterRoot.initDocRelease(DocCenterRoot.java:44)

at com.mathworks.mlwidgets.help.DocCenterRoot.<clinit>(DocCenterRoot.java:26)

at com.mathworks.mlwidgets.help.HelpPrefs.<clinit>(HelpPrefs.java:57)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:264)

at com.mathworks.mlservices.MLHelpServices.getDocRoot(MLHelpServices.java:522)

at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.getDocrootDirectory(ProductInfoUtils.java:698)

at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.getAbsolutePath(ProductInfoUtils.java:685)

at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.parseFile(ProductInfoUtils.java:250)

at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.parseFiles(ProductInfoUtils.java:310)

at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.pathChanged(ProductInfoUtils.java:154)

at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.<init>(ProductInfoUtils.java:80)

at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.getAllProductsInfo(ProductInfoUtils.java:891)

at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.<clinit>(ProductInfoUtils.java:66)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:264)

at com.mathworks.mde.desk.StartupClassLoader$LoadInfo.<init>(StartupClassLoader.java:112)

at com.mathworks.mde.desk.StartupClassLoader.createLoadInfos(StartupClassLoader.java:202)

at com.mathworks.mde.desk.StartupClassLoader.access$500(StartupClassLoader.java:25)

at com.mathworks.mde.desk.StartupClassLoader$2.run(StartupClassLoader.java:223)

at java.lang.Thread.run(Thread.java:748)

if I write code in command window it will be more frightening:

Exception in thread "AWT-EventQueue-0": java.lang.NoClassDefFoundError: Could not initialize class com.mathworks.mlwidgets.help.HelpPrefs

at com.mathworks.mlwidgets.help.HelpUtils.isDocInstalled(HelpUtils.java:454)

at com.mathworks.mde.functionhints.FunctionHints.openFunctionHints(FunctionHints.java:110)

at com.mathworks.mde.cmdwin.CmdWinEditorKit.maybeOpenFunctionHints(CmdWinEditorKit.java:1705)

at com.mathworks.mde.cmdwin.CmdWinEditorKit.access$1000(CmdWinEditorKit.java:87)

at com.mathworks.mde.cmdwin.CmdWinEditorKit$CWDefaultKeyTypedAction.actionPerformed(CmdWinEditorKit.java:2225)

at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1668)

at javax.swing.JComponent.processKeyBinding(JComponent.java:2882)

at javax.swing.JComponent.processKeyBindings(JComponent.java:2929)

at javax.swing.JComponent.processKeyEvent(JComponent.java:2845)

at com.mathworks.mde.cmdwin.XCmdWndView.processKeyEvent(XCmdWndView.java:2486)

at javax.swing.text.JTextComponent.replaceInputMethodText(JTextComponent.java:4722)

at javax.swing.text.JTextComponent.processInputMethodEvent(JTextComponent.java:4483)

at java.awt.Component.processEvent(Component.java:6321)

at java.awt.Container.processEvent(Container.java:2239)

at com.mathworks.mde.cmdwin.XCmdWndView.processEvent(XCmdWndView.java:439)

at java.awt.Component.dispatchEventImpl(Component.java:4889)

at java.awt.Container.dispatchEventImpl(Container.java:2297)

at java.awt.Component.dispatchEvent(Component.java:4711)

at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)

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:74)

at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:84)

at java.awt.EventQueue$4.run(EventQueue.java:733)

at java.awt.EventQueue$4.run(EventQueue.java:731)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)

at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)

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)

[Athul Prakash]

Is it working when you specify -nojvm startup flag?

This doc may be useful:

https://www.mathworks.com/help/compiler/matlab-runtime-startup-options.html

[Athul Prakash]

The error may be due to a corrupted installation of MATLAB or some missing Java libraries. Reintstalling MATLAB is likely to fix this issue.

Answer 1

[Enas S.]

I have the same problem I Reintstalling MATLAB still not working

Answer 2

[Vaidik Patel]

same problem re-login and activation key couldnt help