Found multiple occurrences of org.json.JSONObject on the class path:
jar:file:/home/per/.m2/repository/org/json/json/20180130/json-20180130.jar!/org/json/JSONObject.class
jar:file:/home/per/.m2/repository/com/vaadin/external/google/android-json/0.0.20131108.vaadin1/android-json-0.0.20131108.vaadin1.jar!/org/json/JSONObject.class