Java spring启动-数据源不返回已使用的连接

我在PostgreSQL上使用带hibernate的spring boot

DB:PostgreSQL版本：9.6.8

SPRING启动版本：

我的问题：

两次请求GET调用后，无法从中使用连接 池（或新池）

有人能指出哪里出了问题吗？ 所以抛出下面的异常

    java.sql.SQLTransientConnectionException: SpringBootJPAHikariCP - Connection is not available, request timed out after 3000ms.
        at com.zaxxer.hikari.pool.HikariPool.createTimeoutException(HikariPool.java:667) ~[HikariCP-2.7.8.jar:na]
        at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:183) ~[HikariCP-2.7.8.jar:na]
        at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:148) ~[HikariCP-2.7.8.jar:na]
        at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:128) ~[HikariCP-2.7.8.jar:na]
        at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
    at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:48) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
Caused by: java.sql.SQLTransientConnectionException: SpringBootJPAHikariCP - Connection is not available, request timed out after 3000ms.
    at com.zaxxer.hikari.pool.HikariPool.createTimeoutException(HikariPool.java:667) ~[HikariCP-2.7.8.jar:na]
    at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:183) ~[HikariCP-2.7.8.jar:na]
    at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:148) ~[HikariCP-2.7.8.jar:na]
    at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:128) ~[HikariCP-2.7.8.jar:na]
    at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]

我已设置以下连接池属性

    spring.datasource.hikari.minimumIdle=250
spring.datasource.hikari.maximumPoolSize=5
spring.datasource.hikari.idleTimeout=3000
spring.datasource.hikari.poolName=SpringBootJPAHikariCP
spring.datasource.hikari.maxLifetime=500
spring.datasource.hikari.connectionTimeout=3000

DAO类：

    @Component
public class NickNameDAO {


    @Autowired
    private EntityManagerFactory entityManagerFactory;
    
    
    @Transactional
    public List<NickName> getUserDetails() {
        
        
        
        SessionFactory session = AutoWiringUtils.getSessionFactory(entityManagerFactory);
        
        Criteria criteria = session.openSession().createCriteria(NickName.class);
        List<NickName> returnValues = criteria.list();
        return returnValues;
    }
    
    
}

更新：1

使用

session.getCurrentSession

时，我面临以下异常

@Component
public class NickNameDAO {
    @Autowired
    private EntityManagerFactory entityManagerFactory;
    
    @Transactional
    public List<NickName> getUserDetails() {
        SessionFactory session = AutoWiringUtils.getSessionFactory(entityManagerFactory);
        Criteria criteria = session.getCurrentSession().createCriteria(NickName.class);
        List<NickName> returnValues = criteria.list();
        return returnValues;
    }
}
javax.persistence.TransactionRequiredException: no transaction is in progress
    at org.hibernate.internal.SessionImpl.checkTransactionNeeded(SessionImpl.java:3466) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1426) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1422) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.springframework.orm.hibernate5.SessionFactoryUtils.flush(SessionFactoryUtils.java:147) ~[spring-orm-5.0.5.RELEASE.jar:5.0.5.RELEASE]

@组件
公共类别名{
@自动连线
私人实体管理工厂实体管理工厂；
@交易的
公共列表getUserDetails（）{
SessionFactory session=AutoWiringUtils.getSessionFactory（entityManagerFactory）；
Criteria=session.getCurrentSession（）.createCriteria（昵称.class）；
List returnValues=criteria.List（）；
返回值；
}
}
javax.persistence.TransactionRequiredException:没有正在进行的事务
在org.hibernate.internal.SessionImpl.checkTransactionRequired（SessionImpl.java:3466）~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
在org.hibernate.internal.SessionImpl.doFlush（SessionImpl.java:1426）~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
在org.hibernate.internal.SessionImpl.flush（SessionImpl.java:1422）~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
在org.springframework.orm.hibernate5.SessionFactoryUtils.flush（SessionFactoryUtils.java:147）~[spring-orm-5.0.5.RELEASE.jar:5.0.5.RELEASE]

真是一团糟！您正在使用@Transactional注释打开entityManager的事务，然后打开打开entityManager工厂的会话！只需选择一个就可以了。如果您想使用标准，只需删除@Transactional（即spring数据jpa），根本不创建实体管理器（jpa），只需从emfok中打开会话（特定于hibernate），那么您可以帮助如何在不创建实体管理器的情况下获取SessionFactory.SessionFactory Session=AutoWiringUtils.getSessionFactory吗（entityManagerFactory）；很好，只是不要获取EntityManager或使用它开始TrasAction em.getTransaction（）.begin（），这表示您的配置中缺少设置。但是为什么您首先要使用普通的Hibernate API。而只需使用普通的JPA即可。

@Service
public class NickNameService {
    
    @Autowired
    private NickNameDAO nickNameDAO;
    
    public  List<NickName> getUserDetails() {
        return nickNameDAO.getUserDetails();

    }

}

public class AutoWiringUtils {
    public static SessionFactory getSessionFactory(EntityManagerFactory entityManagerFactory) {
        
        
         
        if (entityManagerFactory.unwrap(SessionFactory.class) == null) {
            throw new NullPointerException("factory is not a hibernate factory");
        }
        return entityManagerFactory.unwrap(SessionFactory.class);
    }

}

@Component
public class NickNameDAO {
    @Autowired
    private EntityManagerFactory entityManagerFactory;
    
    @Transactional
    public List<NickName> getUserDetails() {
        SessionFactory session = AutoWiringUtils.getSessionFactory(entityManagerFactory);
        Criteria criteria = session.getCurrentSession().createCriteria(NickName.class);
        List<NickName> returnValues = criteria.list();
        return returnValues;
    }
}
javax.persistence.TransactionRequiredException: no transaction is in progress
    at org.hibernate.internal.SessionImpl.checkTransactionNeeded(SessionImpl.java:3466) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1426) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1422) ~[hibernate-core-5.2.16.Final.jar:5.2.16.Final]
    at org.springframework.orm.hibernate5.SessionFactoryUtils.flush(SessionFactoryUtils.java:147) ~[spring-orm-5.0.5.RELEASE.jar:5.0.5.RELEASE]