java - BufferedImage isn't presented inside JPanel -

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i've tried test technique presented in ->this answer <-. 

    private void jbutton1mouseclicked(java.awt.event.mouseevent evt) {          bufferedimage img = new bufferedimage(plotpanel.getwidth(),plotpanel.getheight(),bufferedimage.type_4byte_abgr);         graphics2d g2d = img.creategraphics();          g2d.setcolor(color.red);                 g2d.drawline(0, 0, plotpanel.getwidth(), plotpanel.getheight());          jlabel piclabel = new jlabel(new imageicon( img ));          plotpanel.add(piclabel);         plotpanel.revalidate();         plotpanel.repaint();     }

why plotpanel still remains intact?

update

here well-anticipated sscce:

package javaapplication10;  import javax.swing.swingutilities;   public class javaapplication10 {      public static void main(string[] args) {        swingutilities.invokelater(new runnable()        {                public void run()                {                    new newjframe().setvisible(true);                }           });      } } 
package javaapplication10;  import java.awt.color; import java.awt.graphics2d; import java.awt.image.bufferedimage; import javax.swing.imageicon; import javax.swing.jlabel;   public class newjframe extends javax.swing.jframe {      /**      * creates new form newjframe      */     public newjframe() {         initcomponents();     }      /**      * 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() {          plotpanel = new javax.swing.jpanel();         jbutton1 = new javax.swing.jbutton();          setdefaultcloseoperation(javax.swing.windowconstants.exit_on_close);          plotpanel.setbackground(new java.awt.color(255, 255, 255));          javax.swing.grouplayout plotpanellayout = new javax.swing.grouplayout(plotpanel);         plotpanel.setlayout(plotpanellayout);         plotpanellayout.sethorizontalgroup(             plotpanellayout.createparallelgroup(javax.swing.grouplayout.alignment.leading)             .addgap(0, 0, short.max_value)         );         plotpanellayout.setverticalgroup(             plotpanellayout.createparallelgroup(javax.swing.grouplayout.alignment.leading)             .addgap(0, 379, short.max_value)         );          jbutton1.settext("jbutton1");         jbutton1.addmouselistener(new java.awt.event.mouseadapter() {             public void mouseclicked(java.awt.event.mouseevent evt) {                 jbutton1mouseclicked(evt);             }         });          javax.swing.grouplayout layout = new javax.swing.grouplayout(getcontentpane());         getcontentpane().setlayout(layout);         layout.sethorizontalgroup(             layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)             .addgroup(layout.createsequentialgroup()                 .addcontainergap()                 .addgroup(layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)                     .addcomponent(plotpanel, javax.swing.grouplayout.default_size, javax.swing.grouplayout.default_size, short.max_value)                     .addgroup(layout.createsequentialgroup()                         .addcomponent(jbutton1, javax.swing.grouplayout.preferred_size, 116, javax.swing.grouplayout.preferred_size)                         .addgap(0, 758, short.max_value)))                 .addcontainergap())         );         layout.setverticalgroup(             layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)             .addgroup(layout.createsequentialgroup()                 .addcontainergap()                 .addcomponent(plotpanel, javax.swing.grouplayout.preferred_size, javax.swing.grouplayout.default_size, javax.swing.grouplayout.preferred_size)                 .addpreferredgap(javax.swing.layoutstyle.componentplacement.related)                 .addcomponent(jbutton1)                 .addcontainergap(124, short.max_value))         );          plotpanel.getaccessiblecontext().setaccessiblename("plotpanel");         plotpanel.getaccessiblecontext().setaccessibledescription("");          pack();     }// </editor-fold>      private void jbutton1mouseclicked(java.awt.event.mouseevent evt) {            bufferedimage img = new bufferedimage(plotpanel.getwidth(),plotpanel.getheight(),bufferedimage.type_4byte_abgr);         graphics2d g2d = img.creategraphics();          g2d.setcolor(color.red);                 g2d.drawline(0, 0, plotpanel.getwidth(), plotpanel.getheight());          jlabel piclabel = new jlabel(new imageicon( img ));          plotpanel.add(piclabel);         plotpanel.revalidate();         plotpanel.repaint();      }      /**      * @param args command line arguments      */     public static void main(string args[]) {         /* set nimbus , feel */         //<editor-fold defaultstate="collapsed" desc=" , feel setting code (optional) ">         /* if nimbus (introduced in java se 6) not available, stay default , feel.          * details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html           */         try {             (javax.swing.uimanager.lookandfeelinfo info : javax.swing.uimanager.getinstalledlookandfeels()) {                 if ("nimbus".equals(info.getname())) {                     javax.swing.uimanager.setlookandfeel(info.getclassname());                     break;                 }             }         } catch (classnotfoundexception ex) {             java.util.logging.logger.getlogger(newjframe.class.getname()).log(java.util.logging.level.severe, null, ex);         } catch (instantiationexception ex) {             java.util.logging.logger.getlogger(newjframe.class.getname()).log(java.util.logging.level.severe, null, ex);         } catch (illegalaccessexception ex) {             java.util.logging.logger.getlogger(newjframe.class.getname()).log(java.util.logging.level.severe, null, ex);         } catch (javax.swing.unsupportedlookandfeelexception ex) {             java.util.logging.logger.getlogger(newjframe.class.getname()).log(java.util.logging.level.severe, null, ex);         }           java.awt.eventqueue.invokelater(new runnable() {             public void run() {                 new newjframe().setvisible(true);             }         });     }      private javax.swing.jbutton jbutton1;     private javax.swing.jpanel plotpanel;  }

make sure call revalidate after adding jlabel piclabel:

plotpanel.revalidate();

also, you're using grouplayout requires both horizontal , vertical sequential groups added layout new component visible. layout not easy code hand , produces lot of boiler-plate code. use more conventional layout managers become familiar code. see a visual guide layout managers


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