NonUniqueObjectException Hibernate

Question

我有两个实体：Client和RiskPerson。客户有价值可计算他添加的RiskPersons数量。我检查当前客户端是否添加了一个新的Person然后增加该值，否则只保存。在此过程中，当前Person已存在时，我收到错误：

  

org.springframework.web.util.NestedServletException：Request   处理失败;嵌套异常是   org.hibernate.NonUniqueObjectException：一个不同的对象   相同的标识符值已与会话关联：   [com.middle.fpdb.entities.RiskPerson＃14]

我会很乐意帮忙

RiskPersonServiceImpl

...
@Override
@Transactional
public void savePerson(RiskPerson riskPerson) {
    Date date = new Date();
    date = new Timestamp(System.currentTimeMillis());
    Client client = clientService.getClient(2); // EMULATION OF CLIENT
    riskPerson.setClient(client); // EMULATION OF CLIENT
    riskPerson.setTimestamp(date);
    if (!riskPersonDAO.personExists(riskPerson.getId()))
        clientService.incrementClientPeople(2);
    riskPersonDAO.saveRiskPerson(riskPerson);
}
            ...

RiskPersonDAO

...
 @Override
    @Transactional
    public boolean personExists(int id) {
        Session session = sessionFactory.getCurrentSession();
        RiskPerson person = session.get(RiskPerson.class, id);
        if (person == null)
            return false;
        else
            return true;
    }

...

ClientService和客户端DAO

//DAO METHOD
    @Override
    public void incrementClientPeople(int id) {
        Session session = sessionFactory.getCurrentSession();
        Client client = session.get(Client.class, id);
        client.setCountAddedPeople(client.getCountAddedPeople()+1);
    }

//Service method
        @Override
        @Transactional
        public void incrementClientPeople(int id) {
            clientDAO.incrementClientPeople(id);
        }