Java项目中大批量数据查询导致OOM的解决

/**
 * 查询数据执行拨打
 **/
@Override
public void waitingCall() {
    List<CallTask> waitingTaskList = list(Wrappers.<CallTask>lambdaQuery()
            .eq(CallTask::getCallStatus, "WAITING")
            .le(CallTask::getReqTime, new Date())
    );
    if (CollUtil.isEmpty(waitingTaskList)) {
        return;
    }
    call(waitingTaskList);
}
/**
 * 模拟执行具体拨打数据
 **/
private void call(List<CallTask> waitingTaskList) {
    try {
        TimeUnit.SECONDS.sleep(5);
    } catch (InterruptedException e) {
        throw new RuntimeException(e);
    }
}

public void methodOne() {
    long page = 1;
    long limit = 500;
    long total;
    do {
        Page<CallTask> taskPage = new Page<>(page, limit);
        Page<CallTask> pagResult = page(taskPage,
                Wrappers.<CallTask>lambdaQuery()
                        .eq(CallTask::getCallStatus, "WAITING")
                        .le(CallTask::getReqTime, new Date()));
        total = pagResult.getTotal();
        List<CallTask> records = pagResult.getRecords();
        if (CollUtil.isEmpty(records)) {
            break;
        }
        call(records);
        page++;
    } while (page * limit < total);
}

public void methodTwo() {
    Date reqDate = new Date();
    LambdaQueryWrapper<CallTask> wrapper = Wrappers.<CallTask>lambdaQuery()
            .eq(CallTask::getCallStatus, "WAITING")
            .le(CallTask::getReqTime, reqDate);
    int batchSize = 1000;
    int offset = 0;
    while (true) {
        List<CallTask> taskList = list(wrapper.last("limit " + offset + "," + batchSize));
        if (CollUtil.isEmpty(taskList)) {
            break;
        }
        offset += batchSize;
        call(taskList);
    }
}