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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 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 807592, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at java.io.Reader.(Reader.java:61)	at java.io.InputStreamReader.(InputStreamReader.java:80)	at org.simpleframework.xml.core.Persister.read(Persister.java:471)	at org.simpleframework.xml.core.Persister.read(Persister.java:452)	at deviceContainer.DeviceCollectionXMLAO.readXML(DeviceCollectionXMLAO.java:15)	at testContainer.Temp.updateNode(Temp.java:44)	at testContainer.Temp.main(Temp.java:25)