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

        // What is this ??
        urls.add(new File(clctxt.getRealPath("/")).getCanonicalFile().toURL());


        URL urlsA[]=new URL[urls.size()];
        urls.toArray(urlsA);
        loader = new URLClassLoader(urlsA, this.getClass().getClassLoader());


    }

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        urls.add(new File(
                clctxt.getRealPath("/")).getCanonicalFile().toURI().toURL());


        URL urlsA[]=new URL[urls.size()];
        urls.toArray(urlsA);
        loader = new URLClassLoader(urlsA, this.getClass().getClassLoader());


    }

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          // HACK for now
          compileClassPath = compileClassPath.replace("jre", "jdk");
          compileClassPath += "/lib/tools.jar";
          info.append("    checking default compiler in " + compileClassPath + "\n");
          try {
            javaCompiler = Class.forName(compiler, true, new URLClassLoader(new URL[] { new URL("file",
                "localhost", compileClassPath) }));
          } catch (Error er) {
            log.error("Setting up Java compiler error ", er);
          } catch (Exception ex) {
            log.error("Setting up Java compiler exception ", ex);

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        // What is this ??
        urls.add(new File(clctxt.getRealPath("/")).getCanonicalFile().toURL());


        URL urlsA[]=new URL[urls.size()];
        urls.toArray(urlsA);
        loader = new URLClassLoader(urlsA, this.getClass().getClassLoader());


    }

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                    try {
                        //
                        // we need to pass context classloader here, so the jsps can reference /WEB-INF/classes and
                        // /WEB-INF/lib. JspCompilationContext would only take URLClassLoader, so we fake it
                        //
                        URLClassLoader classLoader = new URLClassLoader(new URL[]{}, context.getLoader().getClassLoader());
                        for (Iterator it = names.iterator(); it.hasNext();) {
                            String name = (String) it.next();
                            long time = System.currentTimeMillis();
                            JspCompilationContext jcctx = createJspCompilationContext(name, false, opt, sctx, jrctx, classLoader);
                            ClassLoader prevCl = ClassUtils.overrideThreadContextClassLoader(classLoader);

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                    //
                    // we need to pass context classloader here, so the jsps can reference /WEB-INF/classes and
                    // /WEB-INF/lib. JspCompilationContext would only take URLClassLoader, so we fake it
                    //
                    compileItem("/", opt, context, jrctx, summary,
                            new URLClassLoader(new URL[]{}, context.getLoader().getClassLoader()), 0, compile);
                } finally {
                    jrctx.destroy();
                }
            }

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//            catch (IOException e) {
//                Plugin.getDefault().logError("Unable to locate java library location for code completion.", e);
//            }                       
//        }
        
        return new URLClassLoader(jarURLs.toArray(new URL[0]));
    }

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      this.obj = obj;
    }
  }
  
  @Test public void testDeserializationUnknownException() throws Exception {
    ClassLoader cl = new URLClassLoader(new URL[] {UnitTestUtil.getTestDataFile("test.jar").toURI().toURL()}); //$NON-NLS-1$
    Object obj = ReflectionHelper.create("test.Test", null, cl); //$NON-NLS-1$
    
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(new ExceptionHolder(new BadException(obj)));

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        assertTrue(e instanceof SQLException);
        assertEquals("Remote java.sql.SQLException: something bad happended", e.getMessage()); //$NON-NLS-1$
  }  
  
  @Test public void testDeserializationUnknownChildException2() throws Exception {
    ClassLoader cl = new URLClassLoader(new URL[] {UnitTestUtil.getTestDataFile("test.jar").toURI().toURL()}); //$NON-NLS-1$
    ArrayList<String> args = new ArrayList<String>();
    args.add("Unknown Exception"); //$NON-NLS-1$
    Exception obj = (Exception)ReflectionHelper.create("test.UnknownException", args, cl); //$NON-NLS-1$ 
    
    ByteArrayOutputStream baos = new ByteArrayOutputStream();

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        m.invoke(serverOld);
    }


    private static ClassLoader getClassLoader(String jarFile) throws Exception {
        URL[] urls = { new URL(jarFile) };
        return new URLClassLoader(urls, null);
    }

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