Question

Applet GUI problems..

Asked by: ShawnCurry

You'd think I'd know a thing or three about GUI by now, but I'm stumped.  I've released a project on SourceForge:  JFCML - JFC/Swing XML Markup Language  http://meta-solutions.com/jfcml/index.html .

I'm creating a demo for the website:  http://meta-solutions.com/jfcml/demo/index.html .  I'm running into a little trouble setting the JRootPane more than once.

Basically, the demo lets the user edit a JFCML description file and see the results.  I use javascript to call the runDemo( String ) method defined in the demo class.  The base window container in my package is called JFCMLWindow.  It extends JRootPane and is basically the component that the JFCMLWindowFactory draws on based on the XML. (That's why I need to set the rootpane more than once).

It works the first time(when i call it from init()), but when you click on the button (and call it with javascript), it kills the window.

Here's my demo class (you'll need my jar if you're going to compile it):

import com.metasolutions.jfcml.JFCMLWindow;
import com.metasolutions.jfcml.JFCMLWindowFactory;

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import java.util.regex.MatchResult;

import javax.swing.JApplet;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

import java.io.File;

public class test extends JApplet
{
      private JFCMLWindowFactory factory;
      private JFCMLWindow jfcmlw;
      
      public void init()
      {
            factory = new JFCMLWindowFactory();
            runDemo( "<JFCML><JRootPane><ContentPane><JPanel><JLabel Text=\"Hello World\" Background=\"Color(0,255,0)\"/></JPanel></ContentPane></JRootPane></JFCML>");
      }
      
      
      private static final String HEADER =
            "<?xml version=\"1.0\" encoding=\"UTF-16\"?>\r\n\r\n" +
            "<!DOCTYPE JFCML SYSTEM \"http://meta-solutions.com/jfcml.dtd\">\r\n";
      
      public void runDemo( String input ) {
            final String s = HEADER + input;
            try {
                  SwingUtilities.invokeAndWait( new Runnable() {
                        public void run() {
                              createAndShowGUI( s );
                              System.out.println( "ALL DONE!" );
                              System.out.flush();
                        }
                  });
            } catch( Exception e ) {
                  throw new RuntimeException( "Failed to create GUI", e );
            }
            System.out.println( "returning from rundemo()" );
            System.out.flush();
      }
      
      private void createAndShowGUI( String s ) {
            if( jfcmlw != null )
                  remove( jfcmlw );
            invalidate();
            jfcmlw = new JFCMLWindow();
            factory.build( new java.io.CharArrayReader( s.toCharArray() ), jfcmlw );
            System.out.println( "returned from build" );
            System.out.flush();
            add( jfcmlw );
            repaint();
            System.out.println( "set root pane" );
            System.out.flush();
            
            setSize( 300,300 );
            setVisible( true );
      }
      
}

This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

  • Plus...
  • 30 Day FREE access, no risk, no obligation
  • Collaborate with the world's top tech experts
  • Unlimited access to our exclusive solution database
  • Never be left without tech help again

Subscribe Now

Asked On
2004-10-06 at 22:23:54ID21159057
Tags

applet

,

gui

Topics

Java Programming Language

,

Java AWT & Swing

,

New to Java Programming

Participating Experts
2
Points
200
Comments
10

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

  • "The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
  • "Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
  • "Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.

Screenshot of Experts Exchange Knowledgebase

Need individual assistance?

Our experts are ready to help.

If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.

Screenshot of Experts Exchange Knowledgebase

Want to learn from the best?

Read articles from industry experts.

Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.

Screenshot of an Article

Working on a long term project?

Store your work and research.

Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.

Screenshot of Experts Exchange Knowledgebase

Access the answers to your technology questions today.

Subscribe Now

30-day free trial. Register in 60 seconds.

What Makes Experts Exchange Unique?

Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.

Trusted by the world's most respected brands.

image of each brand's logo

Faithfully serving IT professionals since 1996.

Experts Exchange Logo

Try it out and discover for yourself.

Subscribe Now

30-day free trial. Register in 60 seconds.

Related Solutions

  1. Swing JPanel JFrame
    Alright...I'm having a bit of difficulty with this....Lets say I have a JFrame with 2 content panels. North and south. Inside of contentPaneN I have a JPanel. Inside the JPanel I have a picture being used a background w/: public class MyPanel extends JPanel { private I...

Free Tech Articles

  1. WARNING: 5 Reasons why you should NEVER fix a computer for free.
    It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
  2. SCCM OSD Basic troubleshooting
    SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
  3. Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
    This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
  4. Create a Win7 Gadget
    This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
  5. Outlook continually prompting for username and password
    There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
  6. Backup Exchange 2010 Information Store using Windows Backup
    There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...

Cloud Class Webinars

  1. Avoiding Bugs in Microsoft Access
    Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
  2. Top 10 Best New Features in Visio 2010
    Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
  3. IT Consultant Business Secrets Revealed
    Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
  4. Disaster Recovery and Business Continuity
    Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
  5. Organize Your Visio Diagrams with Containers and Lists
    Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
  6. How to Us Objects, Properties, Events and Methods in Microsoft Access
    Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...

Join the Community

Give a Little. Get a Lot.

Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.

Join the Community

Answers

 

by: Giant2Posted on 2004-10-06 at 23:03:13ID: 12245879

>It works the first time(when i call it from init()), but when you click on the button (and call it with javascript), it kills the window

Any error?

 

by: ShawnCurryPosted on 2004-10-06 at 23:11:32ID: 12245913

Nope - check it out:

http://www.meta-solutions.com/jfcml/demo/index.html

Open your Java console.

 

by: ShawnCurryPosted on 2004-10-06 at 23:15:47ID: 12245929

BTW - you need Java 1.4+ for the demo.

Here's what I have now:

import com.metasolutions.jfcml.JFCMLWindow;
import com.metasolutions.jfcml.JFCMLWindowFactory;

import javax.swing.JApplet;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

import java.io.File;

public class test extends JApplet
{
      private JFCMLWindowFactory factory;
      private JFCMLWindow jfcmlw;
      
      public void init()
      {
            factory = new JFCMLWindowFactory();
            runDemo( "<JFCML><JRootPane><JMenuBar><JMenu Text=\"Hello\" Mnemonic=\"H\"><JMenuItem Text=\"World\"/></JMenu></JMenuBar><ContentPane><JPanel Background=\"Color(255,0,0)\"><JLabel Text=\"Hello World\" Foreground=\"Color(0,255,0)\"/></JPanel></ContentPane></JRootPane></JFCML>");
      }
      
      
      private static final String HEADER =
            "<?xml version=\"1.0\" encoding=\"UTF-16\"?>\r\n\r\n" +
            "<!DOCTYPE JFCML SYSTEM \"http://meta-solutions.com/jfcml.dtd\">\r\n";
      
      public void runDemo( String input ) {
            System.out.println(input);
            final String s = HEADER + input;
            try {
                  SwingUtilities.invokeAndWait( new Runnable() {
                        public void run() {
                              createAndShowGUI( s );
                              System.out.println( "ALL DONE!" );
                              System.out.flush();
                        }
                  });
            } catch( Exception e ) {
                  throw new RuntimeException( "Failed to create GUI", e );
            }
            System.out.println( "returning from rundemo()" );
            System.out.flush();
      }
      
      private void createAndShowGUI( String s ) {
            if( jfcmlw != null )
                  this.removeAll();
            jfcmlw = new JFCMLWindow();
            factory.build( new java.io.CharArrayReader( s.toCharArray() ), jfcmlw );
            System.out.println( "returned from build" );
            System.out.flush();
            invalidate();
            add( jfcmlw );
            repaint();
            
            System.out.println( "set root pane" );
            System.out.flush();
            
            setSize( 300,300 );
            setVisible( true );
      }
      
}

 

by: Giant2Posted on 2004-10-06 at 23:16:58ID: 12245934

Mmm. I see an error on my console (1.4.2_05) about the use some swing component.

 

by: ShawnCurryPosted on 2004-10-06 at 23:25:40ID: 12245955

I've noticed, so long as I call it from init(), it works.  I can call it more than once from init.  BUT, I'll bet when I call it twice from init(), HotSpot is optimizing out the repeated calls.

When you refresh the whole page it comes back.

Oh well.  Give it a shot tomarrow.

Thanks,

Shawn

 

by: ShawnCurryPosted on 2004-10-06 at 23:28:55ID: 12245985

What does it say??  I made it on 1.5-beta2.  It's not an endorsed version.  I set my compile target to 1.4..  Dang.

 

by: RuadRauFlessaPosted on 2004-10-07 at 02:57:37ID: 12247039

I use JDK1.5 and it doesn't wanna load the applet at all

-- Opera Java Console --

Java vendor: Sun Microsystems Inc.
Java version: 1.5.0-beta

type 'h' for help

--
java.lang.ClassNotFoundException: test
      at java.net.URLClassLoader+1.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.net.URLClassLoader.findClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at java.lang.ClassLoader.loadClass(Unknown Source)
      at com.opera.PluginPanel.run(PluginPanel.java:424)
      at java.lang.Thread.run(Unknown Source)

 

by: RuadRauFlessaPosted on 2004-10-07 at 02:59:52ID: 12247045

Sorry that was a browser problem

Hmmm see what you mean

 

by: RuadRauFlessaPosted on 2004-10-07 at 03:18:53ID: 12247125

Looks to me like you have a redraw problem there pal

          ninvalidate();
          add( jfcmlw );
          repaint();

try adding a validate() call just after the add( jfcmlw ) call. That should force the applet to do it's layout and redraw itself

 

by: ShawnCurryPosted on 2004-10-07 at 19:08:52ID: 12255565

Thanks.  There were actually two problems:  I did need the validate() call, and, I needed to setRootPaneCheckingEnabled(false).  I cracked open the source for JApplet, and it turns out setRootPane() (what I tried first) actually handles this automatically.  The method additionally handles removing the existing rootPane, if there is one.

So, I changed back to setRootPane(), and call validate() right after.  Turns out the invalidate() call is unneccessary, as this happens automatically in Container.remove().

So anyway it works now.  Check it out:

http://www.meta-solutions.com/jfcml/demo/index.html

JFCML so closely models the JComponent heirarchy you can probably figure it out from the simple example provided in the demo.  Otherwise, the javadocs and tutorials are a click away from the demo page! </cheap plug>

Thanks a mil,
Shawn

20120131-EE-VQP-002

3 Ways to Join

30-Day Free Trial

The Experts

98% positive feedback on 31,087 answers since March 2000. angeliii is a Microsoft Most Valuable Professional for his work with MS SQL Server & Develoment.

He has also proven his knowledge of Visual Basic Programming, PHP Scripting and Oracle Databases.

The Experts

97% positive feedback on 10,752 answers since July 2000. lrmoore has more than 18 years experience in the networking industry.

The six-time Mircosoft MVPs specialties include firewalls, virtual private networking, and network management.

Testimonials

"...and excellent source for support... Kind of like having your very own IT dept." Electriciansnet

Testimonials

"I was apprehensive at signing up at first. However... it has already made my life as an IT administrator much easier." JaCrews

Testimonials

"WOW! You guys have great, active, and knowledgeable people on here." moore50

Business Clients

Business Clients

In the Press

"If you’ve got a question... Experts Exchange can supply an answer.”

In the Press

"...an invaluable aid for both IT professionals and those who require tech support."

In the Press

"where IT professionals provide quick answers on just about any topic"

Business Account Plans

Loading Advertisement...