测试代码

public void acquireItem(Long uid, Long itemId, IdempotentEnum idempotentEnum, String businessId) {
    doAcquireItem(uid, itemId, idempotent);
}

@Transactional
public void doAcquireItem(Long uid, Long itemId, String idempotent) {
    UserBackpack insert = UserBackpack.builder()
            .uid(uid)
            .itemId(itemId)
            .status(YesOrNoEnum.NO.getStatus())
            .idempotent(idempotent)
            .build();
    userBackpackDao.save(insert);
    int i=1/0;
}

测试结果：数据库插入了数据，证明@Transactional在同类中调用失效

原因参考：https://www.cnblogs.com/ynyhl/articles/12066530.html

常用解决方案：

• 获取本对象的代理对象，再进行调用
  • ((UserBackpackServiceImpl)AopContext.currentProxy()).doAcquireItem(uid, itemId, idempotent);
• 用@Autowired 注入自己 然后在用注入的bean调用自己的方法，要加@Lazy防止循环依赖

@Lazy
@Autowired
UserBackpackServiceImpl userBackpackServiceImpl;

public void acquireItem(Long uid, Long itemId, IdempotentEnum idempotentEnum, String businessId) {
    userBackpackServiceImpl.doAcquireItem(uid, itemId, idempotent);
}

@Transactional
public void doAcquireItem(Long uid, Long itemId, String idempotent) {
    UserBackpack insert = UserBackpack.builder()
            .uid(uid)
            .itemId(itemId)
            .status(YesOrNoEnum.NO.getStatus())
            .idempotent(idempotent)
            .build();
    userBackpackDao.save(insert);
    int i=1/0;
}

经测试，以上两种都可以解决