code: public static void assertTrue(boolean expression, String messageFormat, Object... args) {
  		if (!expression)
  			throw (new KriptonProcessorException(String.format(messageFormat, args)));
  
  	}
docs: Assertion which generate an exception if expression is not true.
  
  @param expression
  the expression
  @param messageFormat
  the message format
  @param args
  the args