Exception in thread "AWT-EventQueue-0": java.lang.NoClassDefFoundError on command window.

Question

Aayush Boliya 2022-3-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1663789-exception-in-thread-awt-eventqueue-0-java-lang-noclassdeffounderror-on-command-window

回答： Kautuk Raj 2025-1-2

I am new to Matlab, learning in Uni. I installed MATLAB from my University license. So, No matter what I type on Command window, the command does execute, but also this long error text in red. For example:

>> 1+1
ans =
     2
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:453)
	at com.mathworks.mde.functionhints.FunctionHints.openFunctionHints(FunctionHints.java:108)
	at com.mathworks.mde.cmdwin.CmdWinEditorKit.maybeOpenFunctionHints(CmdWinEditorKit.java:1706)
	at com.mathworks.mde.cmdwin.CmdWinEditorKit.access$1000(CmdWinEditorKit.java:88)
	at com.mathworks.mde.cmdwin.CmdWinEditorKit$CWDefaultKeyTypedAction.actionPerformed(CmdWinEditorKit.java:2175)
	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:2461)
	at java.awt.Component.processEvent(Component.java:6316)
	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.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1954)
	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:835)
	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1103)
	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:974)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:800)
	at java.awt.Component.dispatchEventImpl(Component.java:4760)
	at java.awt.Container.dispatchEventImpl(Container.java:2297)
	at java.awt.Window.dispatchEventImpl(Window.java:2746)
	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)