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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 jimmyli97
, 1 year ago
via Google Groups by Jeremy Custenborder, 1 year ago
via Google Groups by ankit agarwal, 9 months ago
This exception has no message.
java.lang.NullPointerException at java.util.Hashtable.put( at java.util.Properties.setProperty( at de.tuberlin.dima.schubotz.fse.settings.Settings.setProperty( at de.tuberlin.dima.schubotz.fse.settings.Settings.loadOptions( at de.tuberlin.dima.schubotz.fse.client.ClientConsole.parseParameters( at de.tuberlin.dima.schubotz.fse.MainProgram.main( at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke( at sun.reflect.DelegatingMethodAccessorImpl.invoke( at java.lang.reflect.Method.invoke( at com.intellij.rt.execution.application.AppMain.main(