code: public static StringBuilder createStackTrace(StringBuilder s, StackTraceElement[] stack) {
  		if (stack != null)
  			for (StackTraceElement e : stack) {
  				s.append("\n\tat ");
  				s.append(e.getClassName());
  				if (e.getMethodName() != null) {
  					s.append('.');
  					s.append(e.getMethodName());
  				}
  				if (e.getFileName() != null) {
  					s.append('(');
  					s.append(e.getFileName());
  					s.append(':');
  					s.append(e.getLineNumber());
  					s.append(')');
  				}
  			}
  		return s;
  	}
docs: Append a stack trace to a StringBuilder.