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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 Coderanch by Ramakrishna Udupa, 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, 7 months ago
This exception has no message.
via Google Groups by Undeleterious, 8 months ago
via Java.net JIRA by exu, 2 years ago
via Oracle Community by 807589, 1 year ago
java.lang.NullPointerException: 	at java.io.Reader.(Unknown Source)	at java.io.InputStreamReader.(Unknown Source)	at org.java.ipAddrMain.readFromInputStream(ipAddrMain.java:55)	at org.java.ipAddrMain.start1(ipAddrMain.java:48)	at org.java.ipAddrMain.main(ipAddrMain.java:18)