I have several launch configurations in Eclipse each launching the same Java program but with different parameters.
Now is it possible to run all of these at once (with one mouse click) instead of selecting each of it separately and launching it?
Just install "C/C++ Development Tools" from the CDT (see eclipse.org/cdt/downloads.php ) - this single package is enough, no other CDT packages are needed. This won't disturb your Java environment ;-) Then you have "Launch Groups", for any kind of project, including Java projects. See the following screenshot:
You can run or debug the projects (also mixed mode), define delay times and so on. Have fun!