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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 Stack Overflow by user2121
, 1 year ago
via mozilla.com by Unknown author, 1 year ago
via mozilla.com by Unknown author, 1 year ago
java.lang.NullPointerException: lock == null	at java.io.Reader.(Reader.java:64)	at java.io.BufferedReader.(BufferedReader.java:107)	at java.io.BufferedReader.(BufferedReader.java:95)	at com.example.com.ecoassistant_03.Populator.populate(Populator.java:38)	at com.example.com.ecoassistant_03.ActMain.onOptionsItemSelected(ActMain.java:1182)	at android.app.Activity.onMenuItemSelected(Activity.java:3205)