gistfile1.txt

 private static PreferencesFactory factory() {
        // 1. Try user-specified system property
        String factoryName = AccessController.doPrivileged(
            new PrivilegedAction<String>() {
                public String run() {
                    return System.getProperty(
                        "java.util.prefs.PreferencesFactory");}});
        if (factoryName != null) {
            // FIXME: This code should be run in a doPrivileged and
            // not use the context classloader, to avoid being
            // dependent on the invoking thread.
            // Checking AllPermission also seems wrong.
            try {
                return (PreferencesFactory)
                    Class.forName(factoryName, false,
                                  ClassLoader.getSystemClassLoader())
                    .newInstance();
            } catch (Exception ex) {
                try {
                    // workaround for javaws, plugin,
                    // load factory class using non-system classloader
                    SecurityManager sm = System.getSecurityManager();
                    if (sm != null) {
                        sm.checkPermission(new java.security.AllPermission());
                    }
                    return (PreferencesFactory)
                        Class.forName(factoryName, false,
                                      Thread.currentThread()
                                      .getContextClassLoader())
                        .newInstance();
                } catch (Exception e) {
                    throw new InternalError(
                        "Can't instantiate Preferences factory "
                        + factoryName, e);
                }
            }
        }

        return AccessController.doPrivileged(
            new PrivilegedAction<PreferencesFactory>() {
                public PreferencesFactory run() {
                    return factory1();}});
    }