core/play/src/main/java/play/mvc/Results.java
public static Result notFound(Content content, String charset) {
    return status(NOT_FOUND, content, charset);
  }
public static Result notFound(Content content, String charset) {
    return status(NOT_FOUND, content, charset);
  }
Generates a 404 Not Found result.

@param content the HTTP response body
@param charset the charset into which the content should be encoded (e.g. "UTF-8")
@return the result