java - How to scroll a JScrollPane containing JPanels to top when starting program? -

i have problem jscrollpane can't start @ top when program launched. hoping wizard in here might have answers :p

here's working code example:

public class jscrollpaneexample extends jpanel{  public jscrollpaneexample(int rowcount){      setlayout(new borderlayout());      jscrollpane scrollpane = makescrollpane(rowcount);     add(scrollpane, borderlayout.page_start);     setpreferredsize(new dimension(300,300)); }  private jscrollpane makescrollpane(int rowcount) {     jscrollpane scrollpane = new jscrollpane();      jpanel pane = new jpanel();     pane.setlayout(new gridlayout(rowcount, 0));      for(int = 0; < rowcount; i++){         if(i != 4)             pane.add(maketestfield("test " + (i+1), "test description: " + (i+1), i));         else {             pane.add(maketestfield("this test",                                         "this test see if field line break. "                                        + "this test see if field line break. "                                        + "something else entirely different...",                                         i));         }     }      scrollpane.getviewport().add(pane);     scrollpane.setpreferredsize(new dimension(200, 400));        return scrollpane; }  protected static jpanel maketestfield(string header, string description, int rowcount){      jpanel testfield = new jpanel();      testfield.setlayout(new borderlayout());     testfield.setborder(borderfactory.createemptyborder(5,5,5,5));      jlabel label = new jlabel(header);     font font = new font("serif", font.bold, 18);     label.setfont(font);      jbutton btn = new jbutton("start");      jtextarea textarea = new jtextarea(description);     textarea.seteditable(false);     textarea.setbackground(label.getbackground());     textarea.setlinewrap(true);     textarea.setwrapstyleword(true);     textarea.setborder(borderfactory.createemptyborder(0,0,0,5));      testfield.add(label, borderlayout.page_start);     testfield.add(textarea, borderlayout.center);     testfield.add(btn, borderlayout.line_end);      return testfield; }  public static void main(string[] args) {      swingutilities.invokelater(new runnable() {         public void run() {             // turn off metal's use of bold fonts             uimanager.put("swing.boldmetal", boolean.false);              jframe frame = new jframe();             jpanel scrollpane = new jscrollpaneexample(8);             frame.add(scrollpane);             frame.setvisible(true);             frame.setlocationrelativeto(null);             frame.setdefaultcloseoperation(jframe.exit_on_close);             frame.setpreferredsize(new dimension(500,500));             frame.pack();         }     }); } } 

i have tried quit lot of different methods found while browsing interwebz, such setting viewport of scrollpanel , lot of other stuff, none of success.

to need set value of vertical scroll bar. here code.

public class jscrollpaneexample extends jpanel{      public jscrollpaneexample(int rowcount){          setlayout(new borderlayout());          final jscrollpane scrollpane = makescrollpane(rowcount);         swingutilities.invokelater(new runnable() {              @override             public void run() {                 scrollpane.getverticalscrollbar().setvalue(0);              }         });         add(scrollpane, borderlayout.page_start);         setpreferredsize(new dimension(300,300));     }      private jscrollpane makescrollpane(int rowcount) {         final jscrollpane scrollpane = new jscrollpane();          final jpanel pane = new jpanel();         pane.setlayout(new gridlayout(rowcount, 0));          for(int = 0; < rowcount; i++){             if(i != 4)                 pane.add(maketestfield("test " + (i+1), "test description: " + (i+1), i));             else {                 pane.add(maketestfield("this test",                          "this test see if field line break. "                                 + "this test see if field line break. "                                 + "something else entirely different...",                                  i));             }         }          scrollpane.getviewport().add(pane);         scrollpane.setpreferredsize(new dimension(200, 400));            return scrollpane;     }      protected static jpanel maketestfield(string header, string description, int rowcount){          final jpanel testfield = new jpanel();          testfield.setlayout(new borderlayout());         testfield.setborder(borderfactory.createemptyborder(5,5,5,5));          final jlabel label = new jlabel(header);         final font font = new font("serif", font.bold, 18);         label.setfont(font);          final jbutton btn = new jbutton("start");          final jtextarea textarea = new jtextarea(description);         textarea.seteditable(false);         textarea.setbackground(label.getbackground());         textarea.setlinewrap(true);         textarea.setwrapstyleword(true);         textarea.setborder(borderfactory.createemptyborder(0,0,0,5));          testfield.add(label, borderlayout.page_start);         testfield.add(textarea, borderlayout.center);         testfield.add(btn, borderlayout.line_end);          return testfield;     }      public static void main(string[] args) {          swingutilities.invokelater(new runnable() {             @override             public void run() {                 // turn off metal's use of bold fonts                 uimanager.put("swing.boldmetal", boolean.false);                  final jframe frame = new jframe();                 final jpanel scrollpane = new jscrollpaneexample(8);                 frame.add(scrollpane);                 frame.setvisible(true);                 frame.setlocationrelativeto(null);                 frame.setdefaultcloseoperation(jframe.exit_on_close);                 frame.setpreferredsize(new dimension(500,500));                 frame.pack();             }         });     } }