jodd-core/src/main/java/jodd/io/upload/MultipartStreamParser.java
public String getParameter(final String paramName) {
		if (requestParameters == null) {
			return null;
		}
		String[] values = requestParameters.get(paramName);
		if ((values != null) && (values.length > 0)) {
			return values[0];
		}
		return null;
	}
public String getParameter(final String paramName) {
		if (requestParameters == null) {
			return null;
		}
		String[] values = requestParameters.get(paramName);
		if ((values != null) && (values.length > 0)) {
			return values[0];
		}
		return null;
	}
Returns single value of a parameter. If parameter name is used for
more then one parameter, only the first one will be returned.

@return parameter value, or <code>null</code> if not found