/**
   * Check validity of and populates defaults in a job configuration. This will return a deep copy
   * of the provided job configuration with default configuration values applied, and configuration
   * map values sanitized and applied to their respective struct fields.
   *
   * @param job Job to validate and populate.
   * @return A deep copy of {@code job} that has been populated.
   * @throws TaskDescriptionException If the job configuration is invalid.
   */
  public IJobConfiguration validateAndPopulate(IJobConfiguration job)
      throws TaskDescriptionException {

    requireNonNull(job);

    if (!job.isSetTaskConfig()) {
      throw new TaskDescriptionException("Job configuration must have taskConfig set.");
    }

    if (job.getInstanceCount() <= 0) {
      throw new TaskDescriptionException("Instance count must be positive.");
    }

    JobConfiguration builder = job.newBuilder();

    if (!JobKeys.isValid(job.getKey())) {
      throw new TaskDescriptionException("Job key " + job.getKey() + " is invalid.");
    }

    if (job.isSetOwner() && !UserProvidedStrings.isGoodIdentifier(job.getOwner().getUser())) {
      throw new TaskDescriptionException(
          "Job user contains illegal characters: " + job.getOwner().getUser());
    }

    builder.setTaskConfig(
        validateAndPopulate(ITaskConfig.build(builder.getTaskConfig())).newBuilder());

    // Only one of [service=true, cron_schedule] may be set.
    if (!Strings.isNullOrEmpty(job.getCronSchedule()) && builder.getTaskConfig().isIsService()) {
      throw new TaskDescriptionException(
          "A service task may not be run on a cron schedule: " + builder);
    }

    return IJobConfiguration.build(builder);
  }
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  /**
   * Check validity of and populates defaults in a job configuration. This will return a deep copy
   * of the provided job configuration with default configuration values applied, and configuration
   * map values sanitized and applied to their respective struct fields.
   *
   * @param job Job to validate and populate.
   * @return A deep copy of {@code job} that has been populated.
   * @throws TaskDescriptionException If the job configuration is invalid.
   */
  public static IJobConfiguration validateAndPopulate(IJobConfiguration job)
      throws TaskDescriptionException {

    Objects.requireNonNull(job);

    if (!job.isSetTaskConfig()) {
      throw new TaskDescriptionException("Job configuration must have taskConfig set.");
    }

    if (job.getInstanceCount() <= 0) {
      throw new TaskDescriptionException("Instance count must be positive.");
    }

    JobConfiguration builder = job.newBuilder();

    if (!JobKeys.isValid(job.getKey())) {
      throw new TaskDescriptionException("Job key " + job.getKey() + " is invalid.");
    }

    if (job.isSetOwner()) {
      assertOwnerValidity(job.getOwner());

      if (!job.getKey().getRole().equals(job.getOwner().getRole())) {
        throw new TaskDescriptionException("Role in job key must match job owner.");
      }
    }

    builder.setTaskConfig(
        validateAndPopulate(ITaskConfig.build(builder.getTaskConfig())).newBuilder());

    // Only one of [service=true, cron_schedule] may be set.
    if (!Strings.isNullOrEmpty(job.getCronSchedule()) && builder.getTaskConfig().isIsService()) {
      throw new TaskDescriptionException(
          "A service task may not be run on a cron schedule: " + builder);
    }

    return IJobConfiguration.build(builder);
  }