How to use

setRetainExistingValuesWhenParameterNotProvided

method

in

com.atlassian.jira.issue.IssueInputParameters

void buildForEdit(IssueUpdateBean request, Issue issue)
{
  build(request, getValidFieldsForEdit(issue),true);
  this.parameters.setRetainExistingValuesWhenParameterNotProvided(true, true);
  if (!errors.hasAnyErrors())
  {
    finalizeIssueInputParams(issue, issue);
  }
}

protected void doValidation()
{
  final IssueInputParameters issueInputParameters = issueService.newIssueInputParameters(ActionContext.getParameters());
  issueInputParameters.setRetainExistingValuesWhenParameterNotProvided(false);
  updateValidationResult = issueService.validateUpdate(getLoggedInUser(), getIssueObject().getId(), issueInputParameters);
  setIssueObject(updateValidationResult.getIssue());
  setFieldValuesHolder(updateValidationResult.getFieldValuesHolder());
  if (!updateValidationResult.isValid())
  {
    addErrorCollection(updateValidationResult.getErrorCollection());
  }
}

protected void doValidation()
{
  try
  {
    //just checking that the issue exists and that the user has permission to see it.
    getIssue();
  }
  catch (IssuePermissionException ipe)
  {
    return;
  }
  catch (IssueNotFoundException infe)
  {
    return;
  }
  final IssueInputParameters issueInputParameters = issueService.newIssueInputParameters(ActionContext.getParameters());
  issueInputParameters.setRetainExistingValuesWhenParameterNotProvided(false);
  transitionResult = issueService.validateTransition(getLoggedInUser(), getIssueObject().getId(), action, issueInputParameters);
  setFieldValuesHolder(transitionResult.getFieldValuesHolder());
  if (!transitionResult.isValid())
  {
    addErrorCollection(transitionResult.getErrorCollection());
  }
}