fix singelton issues when using multiple classloaders

singelton_classloader.java

private static Class getClass(String classname)  throws ClassNotFoundException {
      ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
      if(classLoader == null)
         classLoader = Singleton.class.getClassLoader();
      return (classLoader.loadClass(classname));
   }
}

//Source: http://snehaprashant.blogspot.com/2009/01/singleton-pattern-in-java.html
/** The preceding method tries to associate the classloader with the current thread; if that 
classloader is null, the method uses the same classloader that loaded a singleton base class. The 
preceding method can be used instead of Class.forName(). **/