🚀 go-pugleaf

Hi Rich,
    I found the bug in the 1.2 JDK that is responsible for my frustrating
attempts at loading a custom LookAndFeel :

http://developer.java.sun.com/developer/bugParade/bugs/4257902.html

    The first workaround given in the bug database does not work, the whole
area of class loading is a horrible mess. Ever heard of the -Xbootclasspath:
runtime option ?  Also the workarounds given won't work for Applets, the
only way to do this is to use the setUI( ) method on each JComponent with
your own custom ComponentUI.
    My advice, don't even go near the javax.swing.plaf classes.
    Thanks !


"Rich Wilkman" <richw@formlessvoid.com> wrote in message
news:396F1E50.F14D988B@formlessvoid.com...
> Gus:
>
> I can tell you that, for an Applet, it absolutly has to be done in the
> static initializer (you can see how JBuilder loads it by running the
> Applet Wizard).  L&F loading is runtime, which means that compiler-like
> tools such as the Deployment Wizard will not find the classes for you.
> Are you sure that the classes are in your archive (and that the archive
> statement is in the applet html)?
>
> What's the full error in the Java Console (after you switch back to the
> static initializer)?
>
> -Rich
>
> Gus Bellingham wrote:
> >
> > Hi,
> >     this is about plugging in a custom LookAndFeel in Swing - newbies
> > beware!
> >     I've been trying to install a custom LookAndFeel class (source shown
at
> > bottom), and crazy things are going on. I've tried everything I can
think
> > of.  You are supposed to be able to call
> > UIManager.setLookAndFeel("com.spiritone.gus.swing.ShadowLookAndFeel");
> > with the full qualified class name, but it just fails with a
> > ClassNotFoundException,  which is crazy because, I know for a fact the
class
> > files are in the right place (relative to the CLASSPATH), I can load
them ok
> > with Class.forName() in the very code block.
> >     I've tried the other form of the UIManager.setLookAndFeel( ) method,
> > passing in an instance of the LookAndFeel, and that works UNTIL you try
to
> > instantiate a Swing component, then the getUI( ) method fails, with a
> > ClassNotFoundException on the ShadowButtonUI class,  which is also
there, in
> > the correct place, and which I can instantiate and test, without going
> > through UIManager !
> >     I've tried this in a static { } initializer, in the init( ) method,
in
> > the main( ) method of an Application, they all fail in the same way.
Its
> > driving me nuts !    Any bright ideas are very gratefully accepted
> > mailto:gus@spiritone.com     Thanks !
> >
> > Here's the Swing JApplet :
> > package JButton;
> >
> > import java.awt.*;
> > import java.awt.event.*;
> > import java.applet.*;
> > import javax.swing.*;
> > import javax.swing.plaf.*;
> > import com.spiritone.gus.swing.*;
> >
> > public class Applet2 extends JApplet {
> >   boolean isStandalone = false;
> >   JPanel jPanel1 = new JPanel();
> >   JButton jButton1;
> >   file://Pluggable LookAndFeel classes and ComponentUI
> >   ButtonUI ui;
> >   private static Class lnfClass, uiClass;
> >
> >   FlowLayout flowLayout1 = new FlowLayout();
> >
> >   file://Initialize the applet
> >   public void init() {
> >     try {
> >       System.out.println("Applet2 Setting Look & Feel:");
> >
file://UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
> >
> >
file://UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassNa
me())
> > ;
> >
> >       /* I get a ClassNotFound Exception here !
> >        * This sucks, because I've successfully loaded the class already
with
> > Class.forName() above ?
> >        *
> > UIManager.setLookAndFeel("com.spiritone.gus.swing.ShadowLookAndFeel");
> >        */
> >
> >       /* This one works, until a JButton is instantiated, it fails to
load
> > the ButtonUI class:
> >        * UIDefaults.getUI() failed: no ComponentUI class for:
> > javax.swing.JButton (see below)
> >        */
> >       UIManager.setLookAndFeel((LookAndFeel)(lnfClass.newInstance()));
> >       System.out.println("UIManager L&F=" +
> > UIManager.getLookAndFeel().getDescription());
> >       uiClass =
> > Class.forName(UIManager.getDefaults().getString("ButtonUI"));
> >       System.out.println("ButtonUI Class loaded OK =" +
uiClass.getName());
> >
> >     }
> >     catch (ClassNotFoundException e1) {
> >       System.out.println("LookAndFeel : class notfound");
> >       e1.printStackTrace(System.out);
> >     }
> >     catch (Exception e2) {
> >       System.out.println("LookAndFeel : unavailable");
> >       e2.printStackTrace(System.out);
> >     }
> >
> >     try  {
> >       jbInit();
> >     }
> >     catch(Exception e3)  {
> >       e3.printStackTrace();
> >     }
> >   }
> >
> >   file://Component initialization
> >   private void jbInit() throws Exception {
> >     System.out.println("Applet2 CodeBase=" + getCodeBase());
> >     file://this.setSize(new Dimension(300, 100));
> >     System.out.println("About to create JButton");
> >     jButton1 = new JButton();
> >     jButton1.setText("Shadow JButton");
> >     System.out.println("UIDefaults getUI for JButton=" +
> > UIManager.getDefaults().getUI(jButton1));
> >     /* Test the ShadowButtonUI without loading the whole LookAndFeel -
works
> > fine!
> >      * ui = (ButtonUI)ShadowButtonUI.createUI(jButton1);
> >      * jButton1.setUI(ui);
> >      */
> >
> >     jPanel1.setLayout(flowLayout1);
> >     jPanel1.setBackground(Color.white);
> >     this.getContentPane().add(jPanel1, BorderLayout.CENTER);
> >     jPanel1.add(jButton1, null);
> >   }
> >
> >   file://Get Applet information
> >   public String getAppletInfo() {
> >     return "ShadowLookAndFeel Button Applet";
> >   }
> >
> >   file://static initializer for setting look & feel
> >   static {
> >     // LookAndFeel Class Loaded OK here
> >     try {
> >       lnfClass =
Class.forName("com.spiritone.gus.swing.ShadowLookAndFeel");
> >       if (lnfClass != null) {
> >         System.out.println("L&F Class loaded OK =" +
lnfClass.getName());
> >       }
> >     }
> >     catch (ClassNotFoundException e1) {
> >       System.out.println("LookAndFeel : class notfound");
> >       e1.printStackTrace(System.out);
> >     }
> >     catch (Exception e2) {
> >       System.out.println("LookAndFeel : unavailable");
> >       e2.printStackTrace(System.out);
> >     }
> >   }
> > }
> >
> > Here's the problem (this is running under Appletviewer and JDK 1.2):
> >
> >
C:\JBUILDER3\java\bin\AppletViewer.exe -J-Djava.security.policy=C:\JBUILDER3
> >
\lib\appletviewer.policy -J-Djava.class.path=C:\JBuilder3\myclasses;C:\JBUIL
> >
DER3\lib\dx3.0.jar;C:\JBUILDER3\lib\dx3.0-res.jar;C:\JBUILDER3\lib\jbcl3.0.j
> >
ar;C:\JBUILDER3\lib\jbcl3.0-res.jar;C:\JBUILDER3\lib\jgl3.1.0.jar;C:\JBUILDE
> >
R3\lib\dbswing3.0.jar;C:\JBUILDER3\lib\dbswing3.0-res.jar;C:\JBUILDER3\java\
> >
lib\jdkdep.jar;C:\JBUILDER3\java\jre\lib\rt.jar;C:\JBUILDER3\java\lib\dt.jar
> > ;C:\JBUILDER3\java\jre\lib\i18n.jar;C:\JBUILDER3\java\lib\tools.jar
> > C:\JBuilder3\myclasses\JButton.Applet2.html
> > AppAccelerator(tm) 1.2.010 for Java (JDK 1.2), x86 version.
> > Copyright (c) 1997-1999 Inprise Corporation. All Rights Reserved.
> > L&F Class loaded OK =com.spiritone.gus.swing.ShadowLookAndFeel
> > Applet2 Setting Look & Feel:
> > UIManager L&F=Components with offset shadows
> > ButtonUI Class loaded OK =com.spiritone.gus.swing.ShadowButtonUI
> > Applet2 CodeBase=file:/C:/JBuilder3/myclasses/
> > About to create JButton
> > UIDefaults.getUI() failed: no ComponentUI class for:
> >
javax.swing.JButton[,0,0,0x0,invalid,layout=javax.swing.OverlayLayout,alignm
> >
entX=null,alignmentY=null,border=,flags=0,maximumSize=,minimumSize=,preferre
> >
dSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=null,paintBor
> >
der=true,paintFocus=true,pressedIcon=,rolloverEnabled=false,rolloverIcon=,ro
> > lloverSelectedIcon=,selectedIcon=,text=,defaultCapable=true]
> > java.lang.Error
> >  at javax.swing.UIDefaults.getUIError(UIDefaults.java:351)
> >  at javax.swing.UIDefaults.getUI(Compiled Code)
> >  at javax.swing.UIManager.getUI(Compiled Code)
> >  at javax.swing.JButton.updateUI(JButton.java:115)
> >  at javax.swing.AbstractButton.init(AbstractButton.java:1196)
> >  at javax.swing.JButton.<init>(JButton.java:105)
> >  at javax.swing.JButton.<init>(JButton.java:73)
> >  at JButton.Applet2.jbInit(Applet2.java:71)
> >  at JButton.Applet2.init(Applet2.java:59)
> >  at sun.applet.AppletPanel.run(Compiled Code)
> >  at java.lang.Thread.run(Compiled Code)
> > UIDefaults getUI for JButton=null
> >
> > It's the same if I run it in a Browser IE5 with the JRE 1.3 plugin:
> > Java(TM) Plug-in: Version 1.3.0-C Using JRE version 1.3.0 Java
HotSpot(TM)
> > Client VM
> > User home directory = C:\WINDOWS Proxy Configuration: no proxy  JAR
cache
> > enabled.
> > L&F Class loaded OK =com.spiritone.gus.swing.ShadowLookAndFeel
> > Applet2 Setting Look & Feel:
> > UIManager L&F=Components with offset shadows
> > ButtonUI Class loaded OK =com.spiritone.gus.swing.ShadowButtonUI
> > Applet2 CodeBase=file:/C:/JBuilder3/myclasses/
> > About to create JButton
> > UIDefaults.getUI() failed: no ComponentUI class for:
> >
javax.swing.JButton[,0,0,0x0,invalid,layout=javax.swing.OverlayLayout,alignm
> >
entX=null,alignmentY=null,border=,flags=0,maximumSize=,minimumSize=,preferre
> >
dSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=null,paintBor
> >
der=true,paintFocus=true,pressedIcon=,rolloverEnabled=false,rolloverIcon=,ro
> > lloverSelectedIcon=,selectedIcon=,text=,defaultCapable=true]
> > java.lang.Error
> > at javax.swing.UIDefaults.getUIError(Unknown Source)
> > at javax.swing.UIDefaults.getUI(Unknown Source)
> > at javax.swing.UIManager.getUI(Unknown Source)
> > at javax.swing.JButton.updateUI(Unknown Source)
> > at javax.swing.AbstractButton.init(Unknown Source)
> > at javax.swing.JButton.<init>(Unknown Source)
> > at javax.swing.JButton.<init>(Unknown Source)
> > at JButton.Applet2.jbInit(Applet2.java:71)
> > at JButton.Applet2.init(Applet2.java:59)
> > at sun.applet.AppletPanel.run(Unknown Source)
> > at java.lang.Thread.run(Unknown Source)
> >  UIDefaults.getUI() failed: no ComponentUI class for:
> >
javax.swing.JButton[,0,0,0x0,invalid,layout=javax.swing.OverlayLayout,alignm
> >
entX=0.0,alignmentY=0.5,border=,flags=0,maximumSize=,minimumSize=,preferredS
> >
ize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=null,paintBorde
> >
r=true,paintFocus=true,pressedIcon=,rolloverEnabled=false,rolloverIcon=,roll
> > overSelectedIcon=,selectedIcon=,text=Shadow JButton,defaultCapable=true]
> > java.lang.Error  at javax.swing.UIDefaults.getUIError(Unknown Source)
at
> > javax.swing.UIDefaults.getUI(Unknown Source)  at
> > JButton.Applet2.jbInit(Applet2.java:73)  at
> > JButton.Applet2.init(Applet2.java:59)  at
sun.applet.AppletPanel.run(Unknown
> > Source)  at java.lang.Thread.run(Unknown Source)
> > UIDefaults getUI for JButton=null
> >
> > It's the same if I try it in the main( ) method of an Application:
> >
> > C:\JBUILDER3\java\bin\javaw.exe -classpath
> >
"C:\JBuilder3\myclasses;C:\JBUILDER3\lib\dx3.0.jar;C:\JBUILDER3\lib\dx3.0-re
> >
s.jar;C:\JBUILDER3\lib\jbcl3.0.jar;C:\JBUILDER3\lib\jbcl3.0-res.jar;C:\JBUIL
> >
DER3\lib\jgl3.1.0.jar;C:\JBUILDER3\lib\dbswing3.0.jar;C:\JBUILDER3\lib\dbswi
> >
ng3.0-res.jar;C:\JBUILDER3\java\lib\jdkdep.jar;C:\JBUILDER3\java\jre\lib\rt.
> >
jar;C:\JBUILDER3\java\lib\dt.jar;C:\JBUILDER3\java\jre\lib\i18n.jar;C:\JBUIL
> > DER3\java\lib\tools.jar" JButton.Application2
> > AppAccelerator(tm) 1.2.010 for Java (JDK 1.2), x86 version.
> > Copyright (c) 1997-1999 Inprise Corporation. All Rights Reserved.
> > Loading LookAndFeel com.spiritone.gus.swing.ShadowLookAndFeel
> > LookAndFeel Unavailable:
> > java.lang.ClassNotFoundException:
com/spiritone/gus/swing/ShadowLookAndFeel
> >  at java.lang.Class.forName0(Native Method)
> >  at java.lang.Class.forName(Class.java:124)
> >  at javax.swing.UIManager.setLookAndFeel(UIManager.java:365)
> >  at JButton.Application2.main(Application2.java:25)
> >
> > Here's my custom LookAndFeel class, it's real simple :
> >
> > package com.spiritone.gus.swing;
> >
> > import javax.swing.UIDefaults;
> > import javax.swing.plaf.metal.MetalLookAndFeel;
> > import java.io.Serializable;
> >
> > public class ShadowLookAndFeel extends MetalLookAndFeel implements
> > Serializable {
> >
> >   protected void initClassDefaults(UIDefaults table)  {
> >     super.initClassDefaults(table);
> >     table.put ("ButtonUI", "com.spiritone.gus.swing.ShadowButtonUI");
> >   }
> >
> >   public String getID() {
> >     return "Shadow";
> >   }
> >   public String getName() {
> >     return "Shadow L&F";
> >   }
> >   public String getDescription() {
> >     return "Components with offset shadows";
> >   }
> >
> >   public boolean isNativeLookAndFeel() {
> >     return false;
> >   };
> >
> >   public boolean isSupportedLookAndFeel() {
> >     return true;
> >   };
> >
> >   public void initialize() {
> >   }
> >   public void uninitialize() {
> >   }
> >   public String toString() {
> >    return getName() + " : " + getClass().getName();
> >   }
> > }