code: private void startContainer() throws DockerException {
          final long startTime = System.currentTimeMillis();
          try {
              LOGGER.info("Starting container {} with id {}", containerConfig.image(), containerId);
              client.startContainer(containerId);
          } catch (DockerException | InterruptedException e) {
              throw new DockerException(
                      "Unable to start container " + containerConfig.image() + " with id " + containerId, e);
          } finally {
              final long elapsedMillis = System.currentTimeMillis() - startTime;
              LOGGER.info("Container {} started in {}ms", containerConfig.image(), elapsedMillis);
          }
      }
docs: Instructs Docker to start the container
  
  @throws DockerException
  if docker cannot start the container