Question

I have an application which uses threads to run heavy tasks. When the thread ends its own task, it creates a file and sends a message using System.out.println().

In Eclipse works fine, but once compiled into a .jar and called from console, it does not display anything. However it creates correctly the files.

What happends is, when i call the application via console, a new console prompt appears inmediatly, although the program is not finish yet (I know it because no file is being generated yet).

Answer 1

I suspect the problem is how you’re executing the jar file. If you’re just running it from Windows, it’s probably being run with javaw.exe for example. Simply run it explicitly:

java -jar foo.jar

and all should be fine. This is unrelated to threads, by the way… it’s just how jar files are executed.