public static int parsePort(String port, Integer defaultPort) {
    try {
      return Integer.parseInt(trim(port));
    }
    catch (NumberFormatException cause) {
      return Optional.ofNullable(defaultPort)
        .orElseThrow(() -> newIllegalArgumentException(cause, "Port [%s] is not valid", port));
    }
  }
public static int parsePort ( String port , Integer defaultPort ) { try { return Integer . parseInt ( trim ( port ) ) ; } catch ( NumberFormatException cause ) { return Optional . ofNullable ( defaultPort ) . orElseThrow ( ( ) -> newIllegalArgumentException ( cause , "Port [%s] is not valid" , port ) ) ; } }
Parses the given {@link String} as a numeric port number.

@param port {@link String} to parse as a numeric port number.
@param defaultPort {@link Integer} value used as the default port number
if the {@link String} port number is not valid.
@return a numeric port number from the given {@link String}.
@throws IllegalArgumentException if the {@link String} port number is not valid
and {@code defaultPort} is {@literal null}.
@see java.lang.Integer#parseInt(String)