This problem has gone away after sorting the associated problem. See:
Why do I get a Java Exception when I use 'doc' command (2018b)
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Richard Stephens
am 10 Okt. 2018
Beantwortet: Richard Stephens
am 13 Nov. 2018
When using the 'doc' command with a string that is not a command, e.g.:
doc classes
I get a Java Exception event:
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$JsHelpPanelClientRunnable.getUrlToLoad(LightweightHelpPanel.java:224)
at com.mathworks.mlwidgets.help.LightweightHelpPanel$JsHelpPanelClientRunnable.run(LightweightHelpPanel.java:208)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
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.awt.EventQueue.dispatchEvent(EventQueue.java:726)
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)
It works if I use something that is a command, e.g.:
doc classdef
I'm on Linux Ubuntu 18.04. It was fine in R2018a.
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