code: public Collection<T> createAll(final Object... arguments) {
  		Collection<T> instances = new ArrayList<T>(classes.size());
  
  		for (String className : classes) {
  			T instance = createInstance(className, arguments);
  			if (instance != null) {
  				instances.add(instance);
  			}
  		}
  
  		return instances;
  	}
docs: Creates all registered service implementations.
  
  @param arguments
  Arguments for constructors of service implementations
  @return Instances of all service implementations