Detecting launcher (java.exe vs javaw.exe)?

Question

I found myself wondering this morning if one could and how if one could one would detect if the launcher of a particular main(...) were java.exe or javaw.exe programatically. Or by extension could one detect if Swing interfaces were supported.
Consider that one had an application that could be launched from a command line or could be launched as a Swing windowed application. If there was a problem during startup the launcher (or if Swing was supported at the moment) might just be a relevant question when trying to give meaning full information back to the user. Trying to display information in (for example) a JOptionPane would be useless if the current environment didn't support it, and likewise if the launcher was javaw.exe sending the output to System.out or System.err would never be visible to the user.
Spitting out the System.properties yielded some interesting and useful information, but nothing that just screamed at me, "Use me to determine where to send the output."
Thoughts comments or suggestions?
Thanks in advance,
PS.

Answer 1

I thought headless was supposed to handle this?
http://java.sun.com/developer/technicalArticles/J2SE/Desktop/headless/
When your app was run in javaw or java on Windows,
either way your app IS allowed to open a graphical window.
So you cannot tell which way it is.
But if your app is run from the server, or via some nongraphical connection
to a UNIX machine, then supposedly headless would be true.
And you can test for that.