Java NullPointerException on opening documentation

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Tairan Li
Tairan Li 2021-1-29
回答： Anmol Dhiman 2021-1-31
Whenever I search the documentation or open a built-in function I get something like this:
java.lang.NullPointerException
at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:57)
at sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:36)
at java.lang.reflect.Field.get(Field.java:393)
at sun.lwawt.macosx.CAccessibility.getAccessibleRoleFor(CAccessibility.java:248)
at sun.lwawt.macosx.CAccessibility$12.call(CAccessibility.java:263)
at sun.lwawt.macosx.CAccessibility$12.call(CAccessibility.java:260)
at sun.lwawt.macosx.LWCToolkit$CallableWrapper.run(LWCToolkit.java:597)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:301)
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.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)
My matlab version is R2020a maci64, but I had this problem in older versions too.
The documentations can be opened normally, but the error log is quite annoying.

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回答（1 个）

Anmol Dhiman
Anmol Dhiman 2021-1-31
Hi Tairan,
Refer to similar question on the same topic as errors seems to match.
Hope it helps

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