java - NetBeans Swing GUI builder keeps loading -

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i'm trying learn use swing gui , i'm using netbeans arrange controls. however, when come "design" tab, keeps saying "loading ..." forever, can't use builder.

problem screenshot

this default netbeans template, here's code:

/*  * change template, choose tools | templates  * , open template in editor.  */  /*  * newjdialog.java  *  * created on may 29, 2015, 5:29:06 pm  */ package gui;  /**  *  * @author nacho  */ public class newjdialog extends javax.swing.jdialog {      /** creates new form newjdialog */     public newjdialog(java.awt.frame parent, boolean modal) {         super(parent, modal);         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() {          setdefaultcloseoperation(javax.swing.windowconstants.dispose_on_close);         org.jdesktop.layout.grouplayout layout = new org.jdesktop.layout.grouplayout(getcontentpane());         getcontentpane().setlayout(layout);         layout.sethorizontalgroup(             layout.createparallelgroup(org.jdesktop.layout.grouplayout.leading)             .add(0, 400, short.max_value)         );         layout.setverticalgroup(             layout.createparallelgroup(org.jdesktop.layout.grouplayout.leading)             .add(0, 300, short.max_value)         );         pack();     }     // </editor-fold>                              /**      * @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(newjdialog.class.getname()).log(java.util.logging.level.severe, null, ex);         } catch (instantiationexception ex) {             java.util.logging.logger.getlogger(newjdialog.class.getname()).log(java.util.logging.level.severe, null, ex);         } catch (illegalaccessexception ex) {             java.util.logging.logger.getlogger(newjdialog.class.getname()).log(java.util.logging.level.severe, null, ex);         } catch (javax.swing.unsupportedlookandfeelexception ex) {             java.util.logging.logger.getlogger(newjdialog.class.getname()).log(java.util.logging.level.severe, null, ex);         }         //</editor-fold>          /* create , display dialog */         java.awt.eventqueue.invokelater(new runnable() {              public void run() {                 newjdialog dialog = new newjdialog(new javax.swing.jframe(), true);                 dialog.addwindowlistener(new java.awt.event.windowadapter() {                      @override                     public void windowclosing(java.awt.event.windowevent e) {                         system.exit(0);                     }                 });                 dialog.setvisible(true);             }         });     }     // variables declaration - not modify                          // end of variables declaration                    }

this netbeans 7.0.1 in elementary os luna 0.2.1 (ubuntu 12.04).

so, there library/package need install render this? don't know problem might come from. appreciated. in advance.


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