Example usage for java.net URLClassLoader newInstance

Introduction

In this page you can find the example usage for java.net URLClassLoader newInstance.

Prototype

public static URLClassLoader newInstance(final URL[] urls, final ClassLoader parent) 

Source Link

Document

Creates a new instance of URLClassLoader for the specified URLs and parent class loader.

Usage

From source file:tvbrowser.core.PluginLoader.java

private Object loadJavaPlugin(File jarFile) throws TvBrowserException {
    Object plugin = null;/*from   w  w  w .j a v a2 s.c  o  m*/

    // Create a class loader for the plugin
    ClassLoader classLoader;
    ClassLoader classLoader2 = null;

    try {
        URL[] urls = new URL[] { jarFile.toURI().toURL() };
        classLoader = URLClassLoader.newInstance(urls, ClassLoader.getSystemClassLoader());

        try {
            if (!new File(PLUGIN_DIRECTORY).equals(jarFile.getParentFile())
                    && new File(PLUGIN_DIRECTORY, jarFile.getName()).isFile()) {
                urls = new URL[] { new File(PLUGIN_DIRECTORY, jarFile.getName()).toURI().toURL() };
                classLoader2 = URLClassLoader.newInstance(urls, ClassLoader.getSystemClassLoader());
            }
        } catch (MalformedURLException exc) {
        }
    } catch (MalformedURLException exc) {
        throw new TvBrowserException(getClass(), "error.1", "Loading Jar file of a plugin failed: {0}.",
                jarFile.getAbsolutePath(), exc);
    }

    // Get the plugin name
    String pluginName = jarFile.getName();
    if (pluginName.endsWith(".jar")) {
        pluginName = pluginName.substring(0, pluginName.length() - 4);
    }

    boolean isBlockedDataService = false;

    // Create a plugin instance
    try {
        Class pluginClass = classLoader.loadClass(pluginName.toLowerCase() + "." + pluginName);
        Method getVersion = pluginClass.getMethod("getVersion", new Class[0]);
        Version version1 = null;
        try {
            version1 = (Version) getVersion.invoke(pluginClass, new Object[0]);
        } catch (Exception e) {
        }
        if (version1 == null || version1.toString().equals("0.0.0.0")) {
            mLog.warning("Did not load plugin " + pluginName + ", version is too old.");
            return null;
        }

        if (pluginClass.getSuperclass().equals(devplugin.AbstractTvDataService.class) || classLoader2 != null) {
            getVersion = pluginClass.getMethod("getVersion", new Class[0]);
            version1 = (Version) getVersion.invoke(pluginClass, new Object[0]);

            if (pluginClass.getSuperclass().equals(devplugin.AbstractTvDataService.class)) {
                isBlockedDataService = Settings.propBlockedPluginArray
                        .isBlocked(pluginName.toLowerCase() + "." + pluginName, version1);
            }
        }

        if (classLoader2 != null) {
            try {
                Class pluginClass2 = classLoader2.loadClass(pluginName.toLowerCase() + "." + pluginName);
                Method getVersion2 = pluginClass2.getMethod("getVersion", new Class[0]);

                Version version2 = (Version) getVersion2.invoke(pluginClass2, new Object[0]);

                if (version2.compareTo(version1) > 0) {
                    return null;
                }
            } catch (Throwable t) {
            }
        }

        try {
            Method preInstancing = pluginClass.getMethod("preInstancing", new Class[0]);
            preInstancing.invoke(pluginClass, new Object[0]);
        } catch (Throwable ti) {
        }

        if (!isBlockedDataService) {
            plugin = pluginClass.newInstance();
        }
    } catch (Throwable thr) {
        throw new TvBrowserException(getClass(), "error.2", "Could not load plugin {0}.",
                jarFile.getAbsolutePath(), thr);
    }

    return plugin;
}

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From source file:org.apache.zeppelin.interpreter.InterpreterFactory.java

private Interpreter createRepl(String dirName, String className, Properties property)
        throws InterpreterException {
    logger.info("Create repl {} from {}", className, dirName);

    ClassLoader oldcl = Thread.currentThread().getContextClassLoader();
    try {//from w  ww .j a v  a  2 s .com

        URLClassLoader ccl = cleanCl.get(dirName);
        if (ccl == null) {
            // classloader fallback
            ccl = URLClassLoader.newInstance(new URL[] {}, oldcl);
        }

        boolean separateCL = true;
        try { // check if server's classloader has driver already.
            Class cls = this.getClass().forName(className);
            if (cls != null) {
                separateCL = false;
            }
        } catch (Exception e) {
            logger.error("exception checking server classloader driver", e);
        }

        URLClassLoader cl;

        if (separateCL == true) {
            cl = URLClassLoader.newInstance(new URL[] {}, ccl);
        } else {
            cl = ccl;
        }
        Thread.currentThread().setContextClassLoader(cl);

        Class<Interpreter> replClass = (Class<Interpreter>) cl.loadClass(className);
        Constructor<Interpreter> constructor = replClass.getConstructor(new Class[] { Properties.class });
        Interpreter repl = constructor.newInstance(property);
        repl.setClassloaderUrls(ccl.getURLs());
        LazyOpenInterpreter intp = new LazyOpenInterpreter(new ClassloaderInterpreter(repl, cl));
        return intp;
    } catch (SecurityException e) {
        throw new InterpreterException(e);
    } catch (NoSuchMethodException e) {
        throw new InterpreterException(e);
    } catch (IllegalArgumentException e) {
        throw new InterpreterException(e);
    } catch (InstantiationException e) {
        throw new InterpreterException(e);
    } catch (IllegalAccessException e) {
        throw new InterpreterException(e);
    } catch (InvocationTargetException e) {
        throw new InterpreterException(e);
    } catch (ClassNotFoundException e) {
        throw new InterpreterException(e);
    } finally {
        Thread.currentThread().setContextClassLoader(oldcl);
    }
}

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From source file:tvbrowser.core.PluginLoader.java

private void getBaseInfoOfPlugins(File[] plugins, ArrayList<PluginBaseInfo> availablePlugins) {
    for (File plugin : plugins) {
        URL[] urls;/*from ww  w . ja  v a 2  s . co  m*/

        // Get the plugin name
        String pluginName = plugin.getName();
        pluginName = pluginName.substring(0, pluginName.length() - 4);
        Class pluginClass = null;

        try {
            urls = new URL[] { plugin.toURI().toURL() };
            ClassLoader classLoader = URLClassLoader.newInstance(urls, ClassLoader.getSystemClassLoader());

            pluginClass = classLoader.loadClass(pluginName.toLowerCase() + "." + pluginName);
            Method getVersion = pluginClass.getMethod("getVersion", new Class[0]);

            try {
                Version version = (Version) getVersion.invoke(pluginClass, new Object[0]);

                PluginBaseInfo baseInfo = new PluginBaseInfo("java." + pluginClass.getName(), version);

                if (!availablePlugins.contains(baseInfo)) {
                    availablePlugins.add(baseInfo);
                }
            } catch (Exception e) {
            }

        } catch (Throwable t) {
            urls = null;
            pluginClass = null;
            System.gc();

            PluginBaseInfo baseInfo = new PluginBaseInfo("java." + pluginName.toLowerCase() + "." + pluginName,
                    new Version(0, 0));

            if (!availablePlugins.contains(baseInfo)) {
                availablePlugins.add(baseInfo);
            }

            mLog.info("Could not load base info for plugin file '" + plugin.getAbsolutePath()
                    + "'. Use default version instead.");
        }
    }
}

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From source file:org.entando.entando.plugins.jpcomponentinstaller.aps.system.services.installer.DefaultComponentInstaller.java

private URLClassLoader getURLClassLoader(List<URL> urlList, File[] files, ServletContext servletContext) {
    for (File input : files) {
        try {//from  ww  w . j  a  v  a2 s . c  om
            if (!urlList.contains(input.toURI().toURL())) {
                urlList.add(input.toURI().toURL());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    URL[] urls = new URL[urlList.size()];
    for (int i = 0; i < urlList.size(); i++) {
        URL url = urlList.get(i);
        urls[i] = url;
    }

    URLClassLoader cl = URLClassLoader.newInstance(urls, Thread.currentThread().getContextClassLoader());
    return cl;
}

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From source file:net.sourceforge.sqlexplorer.service.SqlexplorerService.java

private Driver createGenericJDBC(String driverJars, String driverName) throws Exception {
    Driver driver = null;//from w w  w. j av a 2s. co  m
    String[] driverJarPath = driverJars.split(SEMICOLON_STRING);
    try {
        int driverCount = 0;
        URL[] driverUrl = new URL[driverJarPath.length];
        for (String dirverpath : driverJarPath) {
            driverUrl[driverCount++] = new File(dirverpath).toURL();
        }
        URLClassLoader cl = URLClassLoader.newInstance(driverUrl,
                Thread.currentThread().getContextClassLoader());
        Class c = cl.loadClass(driverName);
        driver = (Driver) c.newInstance();
    } catch (Exception ex) {
        log.error(ex, ex);
        throw ex;
    }
    return driver;
}

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From source file:tvbrowser.ui.mainframe.MainFrame.java

@Override
public void drop(DropTargetDropEvent dtde) {
    dtde.acceptDrop(dtde.getDropAction());
    File[] files = getDragDropPlugins(dtde.getCurrentDataFlavors(), dtde.getTransferable());

    try {// w w  w .ja v  a 2  s.  c  o m
        File tmpFile = File.createTempFile("plugins", ".txt");
        StringBuilder alreadyInstalled = new StringBuilder();
        StringBuilder notCompatiblePlugins = new StringBuilder();

        for (File jarFile : files) {
            ClassLoader classLoader = null;

            try {
                URL[] urls = new URL[] { jarFile.toURI().toURL() };
                classLoader = URLClassLoader.newInstance(urls, ClassLoader.getSystemClassLoader());
            } catch (MalformedURLException exc) {

            }

            if (classLoader != null) {
                // Get the plugin name
                String pluginName = jarFile.getName();
                pluginName = pluginName.substring(0, pluginName.length() - 4);

                try {
                    String pluginId = "java." + pluginName.toLowerCase() + "." + pluginName;

                    PluginProxy installedPlugin = PluginProxyManager.getInstance().getPluginForId(pluginId);
                    TvDataServiceProxy service = TvDataServiceProxyManager.getInstance()
                            .findDataServiceById(pluginName.toLowerCase() + '.' + pluginName);

                    Class<?> pluginClass = classLoader.loadClass(pluginName.toLowerCase() + '.' + pluginName);

                    Method getVersion = pluginClass.getMethod("getVersion", new Class[0]);

                    Version version1 = null;
                    try {
                        version1 = (Version) getVersion.invoke(pluginClass, new Object[0]);
                    } catch (Throwable t1) {
                        t1.printStackTrace();
                    }

                    if (installedPlugin != null
                            && (installedPlugin.getInfo().getVersion().compareTo(version1) > 0
                                    || (installedPlugin.getInfo().getVersion().compareTo(version1) == 0
                                            && version1.isStable()))) {
                        alreadyInstalled.append(installedPlugin.getInfo().getName()).append('\n');
                    } else if (service != null && (service.getInfo().getVersion().compareTo(version1) > 0
                            || (service.getInfo().getVersion().compareTo(version1) == 0
                                    && version1.isStable()))) {
                        alreadyInstalled.append(service.getInfo().getName()).append('\n');
                    } else {
                        RandomAccessFile write = new RandomAccessFile(tmpFile, "rw");

                        String versionString = Integer.toString(version1.getMajor()) + '.'
                                + (version1.getMinor() / 10) + (version1.getMinor() % 10) + '.'
                                + version1.getSubMinor();

                        write.seek(write.length());

                        write.writeBytes("[plugin:" + pluginName + "]\n");
                        write.writeBytes("name_en=" + pluginName + "\n");
                        write.writeBytes("filename=" + jarFile.getName() + "\n");
                        write.writeBytes("version=" + versionString + "\n");
                        write.writeBytes("stable=" + version1.isStable() + "\n");
                        write.writeBytes("download=" + jarFile.toURI().toURL() + "\n");
                        write.writeBytes("category=unknown\n");

                        write.close();

                    }
                } catch (Exception e) {
                    notCompatiblePlugins.append(jarFile.getName()).append("\n");
                }
            }
        }

        if (alreadyInstalled.length() > 0) {
            showInfoTextMessage(
                    mLocalizer.msg("update.alreadyInstalled",
                            "The following Plugin in current version are already installed:"),
                    alreadyInstalled.toString(), 400);
        }

        if (notCompatiblePlugins.length() > 0) {
            showInfoTextMessage(
                    mLocalizer.msg("update.noTVBPlugin", "This following files are not TV-Browser Plugins:"),
                    notCompatiblePlugins.toString(), 400);
        }

        if (tmpFile.length() > 0) {
            java.net.URL url = tmpFile.toURI().toURL();
            SoftwareUpdater softwareUpdater = new SoftwareUpdater(url, false, true);
            mSoftwareUpdateItems = softwareUpdater.getAvailableSoftwareUpdateItems();
            dtde.dropComplete(true);

            SoftwareUpdateDlg updateDlg = new SoftwareUpdateDlg(this, false, mSoftwareUpdateItems);
            updateDlg.setVisible(true);
        } else {
            dtde.rejectDrop();
            dtde.dropComplete(false);
        }

        if (!tmpFile.delete()) {
            tmpFile.deleteOnExit();
        }
    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

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