Question

我在PostgreSQL上使用带有hibernate的spring boot。

DB：PostgreSQL版本：9.6.8

SPRING-boot版本：

我的问题：

在两个请求GET调用之后，连接不可用游泳池（或新游泳池）。

有人可以指出出了什么问题吗？所以抛出异常

    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课程：

    @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;
    }


}

控制器类：

public class MainController {
@GetMapping(path="/all")
    public @ResponseBody Iterable<NickName> getAllUsers() {
        // This returns a JSON or XML with the users
        return nickNameService.getUserDetails();
    }
}

服务类：

@Service
public class NickNameService {

    @Autowired
    private NickNameDAO nickNameDAO;

    public  List<NickName> getUserDetails() {
        return nickNameDAO.getUserDetails();

    }

}

会话创建者类

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);
    }

}

更新：1

使用session.getCurrentSession我面临异常

时

@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]

spring boot - 数据源不返回已使用的连接

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