Is there any way to turn off the dependency checker in JBuilder, so that it can compile just one class?
If started from the toolbar or menu, it applies to the whole project (active project). Hitting the Make button/menu will recompile all source files that the dependency checker deems modified. The rebuild button will recompile all files.
The same two functions that are found on the context menu of the project view or the context menu for the file tab will apply only to the selected file. So right click on the file you want to compile and hit Make or Rebuild and only the selected file will be compiled.