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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

Solutions on the web

via GitHub by StFS
, 1 year ago
via GitHub by tazmaniax
, 10 months ago
This exception has no message.
via by Unknown author, 2 years ago
via Google Groups by Andreas Beckmann, 2 years ago
via JIRA by Jim Procter, 2 years ago
java.lang.NullPointerException at java.util.Hashtable.put( at java.util.Hashtable.putAll( at org.aeonbits.owner.PropertiesManager.merge( at org.aeonbits.owner.PropertiesManager.load( at org.aeonbits.owner.PropertiesManager.load( at org.aeonbits.owner.PropertiesInvocationHandler.<init>( at org.aeonbits.owner.DefaultFactory.create( at org.aeonbits.owner.ConfigFactory.create( at org.aeonbits.owner.issues.Issue184.before(