Hi, I'm developing an application that needs to display several times the same data model, based on different imput files. This application creates a new instance of a class, let's call it VisADViewer, for each file. When the second instance of the class is created, the following exception is thrown: Visad.TypeException : ScalarType: name already used This happens in this section of my code: ... RealType xRT = new RealType("latitude", null, null); RealType yRT = new RealType("longitude", null, null); RealType zRT = new RealType("temperature", null, null); ... I have nothing declared static... in my code. Did anybody ever experience something like that ? Any idea to solve the problem ? (My first thought is that something may be declared static in the visad package...) Thanks for any help, Alex.