Re: setProperty("headless","true") weirdness?

From:

"Daisy" <jeffrdrew@gmail.com>

Newsgroups:

comp.lang.java.programmer,comp.lang.java.gui

Date:

11 Aug 2006 04:43:57 -0700

Message-ID:

<1155296637.095544.18760@74g2000cwt.googlegroups.com>

Thanks everyone who gave advice!

Here's the revised code which resolved the problem:

System.setProperty( "java.awt.headless" , "true" );
        Toolkit tk = Toolkit.getDefaultToolkit( );

        try {
            // JFrame frame = new JFrame( );
            // frame.getContentPane( ).add( c );

            JPanel panel = new JPanel( );
            panel.add( c );
            panel.addNotify( );

In addition to setting the headless property, I had to swap from Frame
to Panel.

Thanks,

Jeff

Norman D. wrote:

Here is a link which might be helpful:

http://java.sun.com/developer/technicalArticles/J2SE/Desktop/headless/

--Norman

Daisy wrote:

Can anyone provide insight on System.setProperty( "java.awt.headless" ,
"true" )?

I've been struggling with a HeadlessException in the line:
    JFrame frame = new JFrame( );

So I added System.setProperty( "java.awt.headless" , "true" ) before
the JFrame call. However, JFrame still throws this error. Shouldn't
setting the property inform the JVM that it is headless?

System.setProperty( "java.awt.headless" , "true" );
try {
    JFrame frame = new JFrame( );
    frame.getContentPane( ).add( c );
    frame.addNotify( );
} catch ( HeadlessException e ) {
    printStackTrace( );
}

It is a Redhat computer running Hotspot 1.5.0_07 and Tomcat 5.5.17. It
is headless. The application is a servlet that runs fine on linux
machines with monitors. I tried the -Djava.awt.headless=true argument
long ago and still use it.

I'd really appreciate any insight on this problem,

Thanks!