Before I send my query I should just say how much I like ECJ13; thanks for all the work you put in. It makes many things easier for me. I am now considering deploying my ECJ app using web start. The first problem I have is with the parameter files as I would like to open a default file without prompting the user. As I understand it I need to use something like this.getClass().getClassLoader().getResourceAsStream.... to open a text file from within the jar. But ParameterDatabase is expecting java File. I am sure there must be an easy way to do this but my java skills are lacking. Also, can you envisage any other problems with deploying ECJ using web start, Thanks Laurie