How to use

processInstanceId

method

in

org.flowable.content.api.ContentItemQuery

public ResultListDataRepresentation getContentItemsForProcessInstance(String processInstanceId) {
  // TODO: check if process exists
  if (!permissionService.hasReadPermissionOnProcessInstance(SecurityUtils.getCurrentUserObject(), processInstanceId)) {
    throw new NotPermittedException("You are not allowed to read the process with id: " + processInstanceId);
  }
  return createResultRepresentation(contentService.createContentItemQuery().processInstanceId(processInstanceId).list());
}

contentItemQuery.processInstanceId(request.getProcessInstanceId());