java.lang.​NoClassDef​FoundError

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YinSi Zhang
YinSi Zhang 2016-4-3
评论： Sudipta 2017-5-1
I'm a novice learning MATLAB. My MATLAB version is 2015a.I've learned from the guide book that by inputing demos in the command window, I can get help on how to use MATLAB with demonstration. I did as I was told and then the screen displays some error codes. The followings are the screenshot. What should I do. Hoping for solution.
Error using demo (line 21)
Java exception occurred:
java.lang.NoClassDefFoundError: Could not initialize class com.mathworks.mlwidgets.help.ProductFilterModel$InstalledState
at com.mathworks.mlwidgets.help.DocCenterProductPrefs.getSelectedProductsFromPref(DocCenterProductPrefs.java:47)
at com.mathworks.mlwidgets.help.DocCenterProductPrefs.getProductFilterModel(DocCenterProductPrefs.java:33)
at com.mathworks.mlwidgets.help.DocCenterDocConfigParams.<init>(DocCenterDocConfigParams.java:37)
at com.mathworks.mlwidgets.help.DocCenterDocConfig.getLocalConfig(DocCenterDocConfig.java:77)
at com.mathworks.mlwidgets.help.DocCenterDocConfig.getInstance(DocCenterDocConfig.java:65)
at com.mathworks.mlwidgets.help.DocCenterUtils$DefaultDependencyProvider.getDocConfig(DocCenterUtils.java:310)
at com.mathworks.mlwidgets.help.DocCenterUtils.getDocConfig(DocCenterUtils.java:166)
at com.mathworks.mlwidgets.help.DocCenterUtils.getExamplesUrlForDemoCommand(DocCenterUtils.java:157)
at com.mathworks.mde.help.DocCenterBrowserHandler.showDemos(DocCenterBrowserHandler.java:595)
at com.mathworks.mde.help.DocCenterBrowserHandler.showDemos(DocCenterBrowserHandler.java:574)
at com.mathworks.mde.help.HelpBrowserBridge.showDemos(HelpBrowserBridge.java:182)
at com.mathworks.mlservices.MLHelpServices.showDemos(MLHelpServices.java:217)
  1 个评论
Sudipta
Sudipta 2017-5-1
Hi, I am also experiencing the same error message while trying to read a ros bag file. Can anyone tell me why is this? Thanks in advance.

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回答（1 个）

MBD4FUN
MBD4FUN 2016-4-3
If the problem persist even if you restart Matlab, try to do a fresh re-install of Matlab. Hope it helps!
Cheers,
MBD4FUN

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