java - Why JScrollBar doesn't respond to arrow keystrokes when coexist with editable component? -

(things clear in code after description)

i have program contains jscrollbar, jtextarea, jtextfields, jbuttons , other things. (i added sscce codes)

ok, added key bindings left , right jbuttons of jscrollbar , used getinputmap, , getactionmap achieve that.

if have jscrollbar in gui program without editable components such jtextfield or jtextarea, keystrokes keyevent.vk_left , keyevent.vk_right work ok (as expected)

but if have editable component jscrollbar not respond keyevent.vk_left , keyevent.vk_right (not expected) why happen!?
more strange thing if chose different keystrokes bind such keyevent.vk_s left , keyevent.vk_f right, work!! why?

how fix, how make key bindings of left , right arrows jscrollbar jbuttons while editable component coexist?

these 2 working codes in sscce style. first contains jscrollbar without editable components, second contains jscrollbar jtextarea.

the first work ok respond left , right arrows of keyboard. (it doesn't contain editable components)

import java.awt.*; import java.awt.event.*; import javax.swing.*;  public class scrolltest extends jpanel {     jpanel panel;    jscrollbar scrollbar;    jbutton sliderleftbutton;    jbutton sliderrightbutton;     public scrolltest()    {       scrollbar = new jscrollbar(jscrollbar.horizontal, 0, 6, 0, 300);        sliderleftbutton = (jbutton) scrollbar.getaccessiblecontext().getaccessiblechild(1);       sliderleftbutton.getinputmap(jcomponent.when_in_focused_window).put(keystroke.getkeystroke(keyevent.vk_left, 0), "leftmove");       sliderleftbutton.getactionmap().put("leftmove", leftmove);        sliderrightbutton = (jbutton) scrollbar.getaccessiblecontext().getaccessiblechild(0);       sliderrightbutton.getinputmap(jcomponent.when_in_focused_window).put(keystroke.getkeystroke(keyevent.vk_right, 0), "rightmove");       sliderrightbutton.getactionmap().put("rightmove", rightmove);        panel = new jpanel(new gridlayout(2, 0));       panel.add(scrollbar);        this.setlayout(new borderlayout());       this.add(panel, borderlayout.north);    }    abstractaction leftmove = new abstractaction()    {       @override       public void actionperformed(actionevent ae)       {          int increment = scrollbar.getblockincrement();          int current = scrollbar.getvalue();          current -= increment;          scrollbar.setvalue(current);          system.out.println("left");       }    };    abstractaction rightmove = new abstractaction()    {       @override       public void actionperformed(actionevent ae)       {          int increment = scrollbar.getblockincrement();          int current = scrollbar.getvalue();          current += increment;          scrollbar.setvalue(current);          system.out.println("right");       }    };     private static void createandshowgui()    {       jframe frame;       frame = new jframe("scroll test");       frame.setdefaultcloseoperation(jframe.exit_on_close);       frame.setsize(880, 100);       frame.add(new scrolltest(), borderlayout.center);       frame.setvisible(true);    }     public static void main(string[] args)    {       swingutilities.invokelater(new runnable()       {          public void run()          {             uimanager.put("swing.boldmetal", boolean.false);             createandshowgui();          }       });    } } 

the second not work not respond left , right arrows of keyboard. (it contain editable components - 1 jtextarea)

the more strange thing
replace keyevent.vk_left keyevent.vk_s , replace keyevent.vk_right keyevent.vk_f. s work left , f work right! why didn't work left , right arrows.

import java.awt.*; import java.awt.event.*; import javax.swing.*;  public class scrolltest extends jpanel {     jpanel panel;    jpanel panel2;    jscrollbar scrollbar;    jbutton sliderleftbutton;    jbutton sliderrightbutton;     public scrolltest()    {       scrollbar = new jscrollbar(jscrollbar.horizontal, 0, 6, 0, 300);        sliderleftbutton = (jbutton) scrollbar.getaccessiblecontext().getaccessiblechild(1);       sliderleftbutton.getinputmap(jcomponent.when_in_focused_window).put(keystroke.getkeystroke(keyevent.vk_left, 0), "leftmove");       sliderleftbutton.getactionmap().put("leftmove", leftmove);        sliderrightbutton = (jbutton) scrollbar.getaccessiblecontext().getaccessiblechild(0);       sliderrightbutton.getinputmap(jcomponent.when_in_focused_window).put(keystroke.getkeystroke(keyevent.vk_right, 0), "rightmove");       sliderrightbutton.getactionmap().put("rightmove", rightmove);        panel = new jpanel(new gridlayout(2, 0));       panel.add(scrollbar);        panel2 = new jpanel(new gridlayout(1, 0));       panel2.add(new jtextarea(50, 10));        this.setlayout(new borderlayout());       this.add(panel, borderlayout.north);       this.add(panel2, borderlayout.south);    }    abstractaction leftmove = new abstractaction()    {       @override       public void actionperformed(actionevent ae)       {          int increment = scrollbar.getblockincrement();          int current = scrollbar.getvalue();          current -= increment;          scrollbar.setvalue(current);          system.out.println("left");       }    };    abstractaction rightmove = new abstractaction()    {       @override       public void actionperformed(actionevent ae)       {          int increment = scrollbar.getblockincrement();          int current = scrollbar.getvalue();          current += increment;          scrollbar.setvalue(current);          system.out.println("right");       }    };     private static void createandshowgui()    {       jframe frame;       frame = new jframe("scroll test");       frame.setdefaultcloseoperation(jframe.exit_on_close);       frame.setsize(880, 100);       frame.add(new scrolltest(), borderlayout.center);       frame.setvisible(true);    }     public static void main(string[] args)    {       swingutilities.invokelater(new runnable()       {          public void run()          {             uimanager.put("swing.boldmetal", boolean.false);             createandshowgui();          }       });    } } 

this because jtextarea stealing key strokes:

    textpane.getinputmap().put(keystroke.getkeystroke(keyevent.vk_right, 0), "pressed right");     textpane.getactionmap().put("pressed right", rightmove); 

have @ basictextui.installkeyboardactions()