I created Runtime Content in ArcMap of a simple feature layer that just had a few points in it and added attributes. The file created is points.geodatabase and it is relatively small 106 KB. The GeoProcessing result was successful and there were no warnings. I used the following code below to open the geodatabase.
String gdbPath = "/ArcGIS/TEC/PointTest/data/points.geodatabase"
Geodatabase geodatabase = new Geodatabase(gdbPath);
I received the error java.io.FileNotFoundException: "/ArcGIS/TEC/PointTest/data/points.geodatabase does not exist.