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  1. ,

    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.

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)