I've to access to files on the software user and I don't know if it's better to use a full JS app with HTML5 File Api rules or use Java and communicate with it ?
HTML5 file API or Java bridge to acces to local Files?
java;javascript;html5;file systems
If you have the option to use the HTML file api and you are not worried about browser compatibility then you should avoid using 3rd party things like java as a far as possible and keep as close as possible to bare bones. Java requires a JRE to be installed on the client PC, which adds a deployment layer, however simple it may be.