code: public static <O extends Object> void notNull(O o) {
  		if(!validation) return;
  		if(o == null)
  			throw new ParameterException(ErrorCode.NULLPOINTER);
  	}
docs: Checks if the given object is <code>null</code>
  @param o The object to validate.
  @throws ParameterException if the given object is <code>null</code>.