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Unable to load help page in MATLAB

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Alexander Wang
Alexander Wang on 26 Jul 2020
Hi,
The help page for most commands are either blank or in plain text without correct formatting. I tried to Sign In but the button gives no response.
For the blank page, following error codes are shown.
Exception in thread "AWT-EventQueue-0": java.lang.NullPointerException
at com.mathworks.help.helpui.DocRoot.buildDocPageUrl(DocRoot.java:44)
at com.mathworks.help.helpui.DocPageUrlBuilder.buildDocPageUrl(DocPageUrlBuilder.java:25)
at com.mathworks.help.helpui.DocPageUrlBuilder.buildFileUrl(DocPageUrlBuilder.java:21)
at com.mathworks.mlwidgets.help.LightweightHelpPanel$JsHelpPanelClientRunnable.getUrlToLoad(LightweightHelpPanel.java:258)
at com.mathworks.mlwidgets.help.LightweightHelpPanel$JsHelpPanelClientRunnable.run(LightweightHelpPanel.java:236)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
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:74)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
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)
For reference, my os version is fedora 32 and
>> version -java
ans =
'Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode'
Any idea? Thanks in advance.
  4 Comments
Alexander Wang
Alexander Wang on 27 Jul 2020
If possible plz try to upgrade to Matlab 2020a and see if problems persist. Though personally I don't think it should matter.

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