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    Thrown when an application is trying to use or access an object whose reference equals to null but if you are getting no message, try using the option -XX:-OmitStackTraceInFastThrow.

Solutions on the web

via Google Groups by Konstantinos Fotiadis, 1 year ago
This exception has no message.
via GitHub by ex00
, 1 year ago
This exception has no message.
via Google Groups by Stefan Bielenberg, 9 months ago
This exception has no message.
via Google Groups by Undeleterious, 10 months ago
java.lang.NullPointerException at java.io.Reader.<init>(Unknown Source) at java.io.InputStreamReader.<init>(Unknown Source) at com.hellas.smoke.googleCalendar.CalendarSample.authorize(CalendarSample.java:87) at com.hellas.smoke.googleCalendar.CalendarSample.main(CalendarSample.java:111)