public virtual object execute(CommandContext commandContext)
{
ensureNotNull("taskId", taskId);
TaskManager taskManager = commandContext.TaskManager;
TaskEntity task = taskManager.findTaskById(taskId);
ensureNotNull("Cannot find task with id " + taskId, "task", task);
checkDelegateTask(task, commandContext);
task.@delegate(userId);
task.createHistoricTaskDetails(org.camunda.bpm.engine.history.UserOperationLogEntry_Fields.OPERATION_TYPE_DELEGATE);
return(null);
}