java - JSpinner with SpinnerDateModel not spinning -

i'm developing java application using swing create gui. have problem jspinner, whih should allow user select time, in hh:mm format, specific range. created custom spinnerdatemodel , dateeditor , seems ok, when run application spinner shows proper value doesn't spinn.

import java.util.calendar; import java.util.date; import javax.swing.jspinner; import javax.swing.spinnerdatemodel;  public class spinnerexample extends javax.swing.jframe {  public static void main(string[] args) {     spinnerexample main = new spinnerexample();     main.setvisible(true); }  /**  * creates new form mainframe  */ public spinnerexample() {     initcomponents();      myspinner.setmodel(getmyspinnermodel());     myspinner.seteditor(new jspinner.dateeditor(myspinner, "hh:mm"));   }  public spinnerdatemodel getmyspinnermodel() {     spinnerdatemodel spinnermodel = new spinnerdatemodel();     calendar calendar = calendar.getinstance();     calendar.set(calendar.hour_of_day, 12);     calendar.set(calendar.minute, 0);     date selecteddate = calendar.gettime();     calendar.set(calendar.hour_of_day, 23);     date enddate = calendar.gettime();     calendar.set(calendar.hour_of_day, 1);     date startdate = calendar.gettime();     spinnermodel = new spinnerdatemodel(selecteddate, startdate, enddate, calendar.hour_of_day);      return spinnermodel; }  /**  * method called within constructor initialize form.  * warning: not modify code. content of method  * regenerated form editor.  */ @suppresswarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="generated code">                           private void initcomponents() {      myspinner = new javax.swing.jspinner();      setdefaultcloseoperation(javax.swing.windowconstants.exit_on_close);      javax.swing.grouplayout layout = new javax.swing.grouplayout(getcontentpane());     getcontentpane().setlayout(layout);     layout.sethorizontalgroup(         layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)         .addgroup(layout.createsequentialgroup()             .addgap(176, 176, 176)             .addcomponent(myspinner, javax.swing.grouplayout.preferred_size, javax.swing.grouplayout.default_size, javax.swing.grouplayout.preferred_size)             .addcontainergap(195, short.max_value))     );     layout.setverticalgroup(         layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)         .addgroup(layout.createsequentialgroup()             .addgap(106, 106, 106)             .addcomponent(myspinner, javax.swing.grouplayout.preferred_size, javax.swing.grouplayout.default_size, javax.swing.grouplayout.preferred_size)             .addcontainergap(174, short.max_value))     );      pack(); }// </editor-fold>                           // variables declaration - not modify                      private javax.swing.jspinner myspinner; // end of variables declaration                    } 

when put nulls "start" , "end" parameters while creating spinnermodel below:

spinnermodel = new spinnerdatemodel(selecteddate, null, null, calendar.hour_of_day); 

spinner works well.

what can wrong here?

i same strange behavior , can't find reasonable explanation. however, works using custom editor class below. solve problem?

import java.awt.event.actionevent; import java.text.simpledateformat; import java.util.calendar; import java.util.date; import javax.swing.jformattedtextfield; import javax.swing.jframe; import javax.swing.jspinner; import javax.swing.spinnerdatemodel; import javax.swing.event.changeevent; import javax.swing.event.changelistener; import javax.swing.text.dateformatter; import javax.swing.text.defaultformatterfactory;  public class spinnerexample extends jframe {      private final jspinner myspinner;      public static void main(string[] args) {         spinnerexample main = new spinnerexample();     }      public spinnerexample() {         super("spinnerexample");          myspinner = new jspinner();         myspinner.setmodel(getmyspinnermodel()); //        myspinner.seteditor(new jspinner.dateeditor(myspinner, "hh:mm"));         myspinner.seteditor(new customeditor(myspinner, "hh:mm"));          add(myspinner);          pack();         setvisible(true);         setdefaultcloseoperation(exit_on_close);     }      private spinnerdatemodel getmyspinnermodel() {         calendar calendar = calendar.getinstance();         calendar.set(calendar.hour_of_day, 10);         calendar.set(calendar.minute, 0);         calendar.set(calendar.second, 0);         date selecteddate = calendar.gettime();         calendar.set(calendar.hour_of_day, 23);         date enddate = calendar.gettime();         calendar.set(calendar.hour_of_day, 0);         date startdate = calendar.gettime();         return new spinnerdatemodel(selecteddate, startdate,                 enddate, calendar.hour);     } }  class customeditor extends jformattedtextfield implements changelistener {      private final jspinner spinner;      public customeditor(jspinner spinner, string pattern) {         super();         this.spinner = spinner;         dateformatter formatter                 = new dateformatter(new simpledateformat(pattern));         formatter.setallowsinvalid(false);         formatter.setoverwritemode(true);         setformatterfactory(new defaultformatterfactory(formatter));         updatevalue();         spinner.addchangelistener(this);         addactionlistener((actionevent e) -> {             this.spinner.getmodel().setvalue(this.getvalue());         });     }      @override     public void statechanged(changeevent e) {         updatevalue();     }      private void updatevalue() {         setvalue((date) spinner.getmodel().getvalue());     } }