Question: I have a java application that reports on the up/down status of several websites and creates a .json file with the data. I have an HTML page that uses javascript to take a .json file and display a nice little grid with red or green lights telling you if a website is up or down. I have *no idea* how to make the java app tell the html page exactly what the .json file is named (i create a new timestamped .json file every app run). Is there any way to pass a parameter or something to the HTML page on load (currently using `Desktop.getDesktop().browse(URI.create("file://blah");`), or am I stuck to overwriting my .json file every time I run the app?

Answer: 
For me the best trick is to clean the project: 

At Eclipse:
Project -> Clean -> Select project and than OK.
Are you using your build over "Build automatically" ? Any changes of your code, after autosave your project is build again and the R-File is generated.