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  Plugin and JWS  (Read 1398 times)
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Offline Bonbon-Chan

JGO Coder


Medals: 12



« Posted 2008-05-16 13:56:22 »

I want to do a plugin system for a sprite sheet editor. I found a solution with :

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protected void loadPlugin() throws MalformedURLException
    {
      File rep = new File(repPlugin);
      URL url = rep.toURI().toURL();
      URL[] urls = new URL[]{url};
     
      try
      {
        this.getClass().getClassLoader().loadClass("net.bonbonchan.tools.spriteanim.plugin.Plugin");
      }
      catch(Exception ex) { System.err.println("Class not found for Plugin !!! O_o"); }
     
      URLClassLoader loader = new URLClassLoader(urls);
     
      plugins.removeAllElements();
     
      File fic[] = rep.listFiles();
      for(int i=0;i<fic.length;i++)
      {
        if (fic[i].getName().endsWith(".class"))
        {
          try
          {
            System.out.println("Loading class : "+fic[i].getAbsolutePath());
             
            String fileName = fic[i].getName();
            String className = fileName.substring(0,fileName.indexOf("."));
            Class fileClass = loader.loadClass(className);
            Object fileObject = fileClass.newInstance();
           
            if (fileObject instanceof Plugin)
            {
              Plugin plugin = (Plugin)fileObject;
              plugins.add(plugin);
            }
          }
          catch(Exception ex)
          {
            System.out.println(ex.toString());
          }
        }
      }
     
      pluginListModel.setPlugins(plugins);
    }


So plugins are subclass of net.bonbonchan.tools.spriteanim.plugin.Plugin in the default package.
In netbean, it work fine. With the jar, it work fine. With JavaWebStart, it doesn't work  Huh

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Java Web Start 1.6.0_05
Utilisation de la version JRE 1.6.0_05 Java HotSpot(TM) Client VM

...

Loading class : E:\ ... \classes\JSAPacker$1.class
Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: net/bonbonchan/tools/spriteanim/plugin/Plugin
   at java.lang.ClassLoader.defineClass1(Native Method)
   at java.lang.ClassLoader.defineClass(Unknown Source)
   
...

   at java.lang.Class.newInstance(Unknown Source)
   at net.bonbonchan.tools.spriteanim.JMain.loadPlugin(JMain.java:236)

...  

Caused by: java.lang.ClassNotFoundException: net.bonbonchan.tools.spriteanim.plugin.Plugin
   
...


The line 236 is : Object fileObject = fileClass.newInstance();

I really don't get it.
Why it is thrown at line 236 and not at this.getClass().getClassLoader().loadClass("net.bonbonchan.tools.spriteanim.plugin.Plugin"); ??
Why it is thrown and NOT CATCH by catch(Exception ex) Huh

It is the first time that I do a plugin system, so if someone can help me  Wink
Offline Bonbon-Chan

JGO Coder


Medals: 12



« Reply #1 - Posted 2008-05-19 12:56:59 »

SOLVE : see this post
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