Continuing the discussion from Creating one Histogram of multiple ROIs:
Can you paste the warning? The proper fix would, ideally, be to address whatever is emitting it, to not do so.
OK, I’ll tell you a secret: there is a way to turn off the console window: you can pass
-Dscijava.noConsole=true to the JVM on startup, and a console window will not be created. But it is for local use only, because I do not want to receive bug reports from users where “nothing happens” because an error was silently discarded. Please do not ship any functionality with your update sites to automate this!