Java SE (Java Platform, Standard Edition)

Hi,

I am trying to make a JFrame that covers full screen, but the windows taskbar should remain visible. Just as a normal application like your browser.
I already have this:

//Prepare frame
	    frmMain = new JFrame ("Invoice main screen");		//Create frame	 
	    //frmMain.setSize(Toolkit.getDefaultToolkit().getScreenSize());
	    frmMain.setExtendedState(JFrame.MAXIMIZED_BOTH);	//maximize screen
	    frmMain.setVisible(true);
	    frmMain.setResizable(false);
	    frmMain.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

I tried the setSize and the setExtendedState, but it still covers my taskbar.
Any ideas?