Re: "javaw.exe" does NOT prevent popup of black command prompt when starting GUI *.jar prgm

Eric Sosman <esosman@ieee-dot-org.invalid>
Mon, 28 Dec 2009 11:07:40 -0500
On 12/28/2009 8:17 AM, Lew wrote:

Please do not top-post.

Ulf Meinhardt wrote:

I read that when I start a GUI based java program with

javaw.exe -jar myprgm.jar

instead of

java.exe -jar myprgm.jar

then NO black command prompt console window is visible/poped up
(under WinXP).

This is not true!

javaw.exe shows the command prompt window as well (in addition to
the actual GUI window)!!!
Is there really no way of preventing the popup of the console?

Donkey Hottie wrote:

Is this javaw.exe invocation in a batch file (.bat, .cmd)? If so,
then the console window will show.

It should not show up if the javaw is called directly from the shortcut.

Ulf Meinhardt wrote:

Yes, you are right.
It's in a *.bat batch file

How can I prevent the popup in this case?

I don't think you can, but this is a Windows question, not a Java question.

Are you able to arrange things so that you don't need a .bat file? By
design, JAR files are standalone distribution vehicles for Java
applications and should not need to run from script files. Just invoke
javaw directly, as the Don suggested.

You can also set up an association between javaw and the .jar extension
so that Windows will run a JAR by double-clicking on it.

     Stepping back a bit, the console window you see is not Java's
window but the .bat file's window. You would see it even if the
..bat file ran something not involving Java at all. That's why this
is a Windows question, not a Java question.

Eric Sosman

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