Examples of java.net.URLClassLoader

java.net.URLClassLoader
This class loader is used to load classes and resources from a search path of URLs referring to both JAR files and directories. Any URL that ends with a '/' is assumed to refer to a directory. Otherwise, the URL is assumed to refer to a JAR file which will be opened as needed.
The AccessControlContext of the thread that created the instance of URLClassLoader will be used when subsequently loading classes and resources.
The classes that are loaded are by default granted permission only to access the URLs specified when the URLClassLoader was created. @author David Connelly @version 1.91, 04/06/07 @since 1.2

        return cfg;
    }
    
    private URLClassLoader createSEIClassLoader(File classDir) {
        
        URLClassLoader loader = null;
        try {
            loader = URLClassLoader.newInstance(new URL[]{classDir.toURL()},
                                                Thread.currentThread().getContextClassLoader());
        } catch (MalformedURLException mue) {
            throw new WebServiceException("URLClassLoader creation failed", mue);

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        private Collection<Class<?>> find(Matcher matcher) throws MalformedURLException { 
            List<Class<?>> classes = new ArrayList<Class<?>>();
            
            File root = new File(rootPath);
            URL[] urls = {root.toURL()};
            URLClassLoader loader = new URLClassLoader(urls, parent);
            
            find(root, loader, classes, matcher);
            return classes;
        }

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        writer.write(RESOURCE_DATA);
        writer.write("\n");
        writer.close();


        URL[] urls = {resource.getParentFile().toURL()};
        ClassLoader loader = new URLClassLoader(urls); 
        assertNotNull(loader.getResourceAsStream(resourceName));
        assertNull(ClassLoader.getSystemResourceAsStream(resourceName));
        clr = new ClassLoaderResolver(loader);
    }

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                    getLog().debug("adding to classpath '" + file + "'");
                }
                classpathUrls[ctr] = file.toURI().toURL();
            }


            final URLClassLoader loader =
                new URLClassLoader(classpathUrls,
                    Thread.currentThread().getContextClassLoader());
            Thread.currentThread().setContextClassLoader(loader);
        }
    }

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     */
    protected void initializeClassLoaderWithJdbcDriver()
        throws MalformedURLException
    {
        Thread.currentThread().setContextClassLoader(
            new URLClassLoader(
                new URL[] {new File(this.jdbcDriverJar).toURI().toURL()},
                Thread.currentThread().getContextClassLoader()));
    }

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        final String jdbcDriverJar = this.getRequiredProperty(
                options,
                "jdbcDriverJar");
        if (jdbcDriverJarLoader == null)
        {
            jdbcDriverJarLoader = new URLClassLoader(new URL[] {new File(jdbcDriverJar).toURI().toURL()});
        }
        return jdbcDriverJarLoader;
    }

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   /*
    * Start the server
    */
   public void run() {
      ClassLoaderFactory factory = glob.getClassLoaderFactory();
      URLClassLoader cl = null;


      try {
         cl = factory.getXmlBlasterClassLoader();
         if( log.isLoggable(Level.FINE)) log.fine("Get first instance of org.xmlBlaster.Main via own class loader.");


         this.xmlBlasterMain = (I_Main)cl.loadClass("org.xmlBlaster.Main").newInstance();
         // java.util.Properties props = glob.getProperty().getProperties();
         // this.xmlBlasterMain.init(props);
         this.xmlBlasterMain.init(glob);
         /*
         Class[] paramClasses = { glob.getArgs().getClass() };
         Object[] params = { glob.getArgs() };
         java.lang.reflect.Constructor constructor = mainClass.getDeclaredConstructor( paramClasses );
         mainObject = constructor.newInstance( params );
         if ( mainObject instanceof org.xmlBlaster.Main ) {
         }
         else {
            log.error( ME, "Error in constructing org.xmlBlaster.Main!");
            System.exit(-1);
         }
         */
         log.info("Successfully loaded org.xmlBlaster.Main instance with specific classloader");
      } catch(Throwable e) {
         if (cl != null)
            log.severe("Problems loading org.xmlBlaster.Main with ClassLoader "+cl.getClass().getName()+": " + e.toString() + " -> using default classloader");
         else
            log.severe("Problems loading org.xmlBlaster.Main (classloader = 'null' ???): " + e.toString() + " -> using default classloader");
         this.xmlBlasterMain = new org.xmlBlaster.Main(glob);
         log.info("Successfully loaded org.xmlBlaster.Main instance with default classloader");
      }

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            }
        }


        // 2: If URLClassLoader implements Closeable, use that.
        if (Closeable.class.isAssignableFrom(URLClassLoader.class))
            return new URLClassLoader(urls, thisClassLoader);


        // 3: Try using private reflection-based CloseableURLClassLoader
        try {
            return new CloseableURLClassLoader(urls, thisClassLoader);
        } catch (Throwable t) {
            // ignore errors loading workaround class loader, fall through
        }


        // 4: If all else fails, use plain old standard URLClassLoader
        return new URLClassLoader(urls, thisClassLoader);
    }

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   }
   
   
   public void testVersionTransformerCache() {
      try {
         URLClassLoader cl = (URLClassLoader)getClass().getClassLoader();
         URL[] urls = cl.getURLs();
         String url = null;
         for (int i=0; i < urls.length; i++) {
            int pos = urls[i].getFile().indexOf(File.separator + "xmlBlaster" + File.separator + "lib" + File.separator); 
            if (pos > -1) {
               url = urls[i].getFile().substring(0, pos);
               break;
            }
         }
         if (url == null)
            url = "";
         log.info("The found xmlBlaster url is '" + url + "'");
         StringBuffer buf = new StringBuffer();
         buf.append(File.separator).append("xmlBlaster");
         buf.append(File.separator).append("testsuite");
         buf.append(File.separator).append("data");
         buf.append(File.separator).append("xsl").append(File.separator);
         String name = "file:" + url + buf.toString();
         URL[] tmpUrls = new URL[] { new URL(name) };
         URLClassLoader subLoader = URLClassLoader.newInstance(tmpUrls, cl);
         
         // Object obj = subLoader.loadClass(TestHelperClasses.class.getName()).newInstance();
         // Method method = obj.getClass().getMethod("testVersionTransformerCacheInternal", null);
         // method.invoke(obj, null);

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      try {
         ClassLoaderFactory factory = glob.getClassLoaderFactory();
         if (factory != null) {
            if (log.isLoggable(Level.FINE)) log.fine("useXmlBlasterClassloader=true: Trying Class.forName('" + pluginName + "') ...");


            URLClassLoader myLoader = factory.getPluginClassLoader(pluginInfo);
            if (log.isLoggable(Level.FINE)) log.fine("Found " + myLoader.getURLs().length + " plugin specific jar files for '" + pluginName + "' preferenced by xmlBlaster classLoader");


            plugin = (I_Plugin)myLoader.loadClass(pluginName).newInstance();
            if (log.isLoggable(Level.FINE)) log.fine("Found I_Plugin '" + pluginName + "', loaded by PluginClassLoader");
         }
         else { // Use JVM default class loader:
           Class cl = java.lang.Class.forName(pluginName);
           plugin = (I_Plugin)cl.newInstance();

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