A snip for making underdecorated Swing Jframes movable

Move.java

    int xy,xx;
//replace sidepane with your control/container to which you want to move
    private void sidepaneMouseDragged(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_sidepaneMouseDragged
        // TODO add your handling code here:
        int x = evt.getXOnScreen();
        int y = evt.getYOnScreen();
        this.setLocation(x - xx, y - xy);  
    }//GEN-LAST:event_sidepaneMouseDragged

    private void sidepaneMousePressed(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_sidepaneMousePressed
        // TODO add your handling code here:
        xx = evt.getX();
        xy = evt.getY();
    }//GEN-LAST:event_sidepaneMousePressed