无法获取JDBC连接

Question

我有一个带有Hibernate和Hikari DataSource的Spring Boot项目。如果我有一些注入SessionFactory对象的功能来获取会话对象，那么在几天内我就会遇到与db操作相关的任何方法的异常（只有重启才能解决这个问题）：

org.springframework.transaction.CannotCreateTransactionException: 
Could not open JPA EntityManager for transaction; nested exception is 
javax.persistence.PersistenceException: 
org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection at
......
Caused by: java.sql.SQLTransientConnectionException: HikariPool-1 - 
Connection is not available, request timed out after 30001ms.

似乎手动使用会话使这个问题。 （我有相同的配置和功能的类似项目，但没有注入SessionFactory和Session ......我根本没有这样的问题）

application.yaml：

spring:
  jpa:
    properties:
      hibernate:
        dialect : org.hibernate.dialect.PostgreSQLDialect
        current_session_context_class: org.springframework.orm.hibernate5.SpringSessionContext

DataSourceConfig

@EnableJpaRepositories("com.my.project.config")
@Configuration
public class DataSourceConfig {

    @Inject
    private AppProperties properties;

    @Bean(name = "dataSource")
    public DataSource dataSource() {
        AppProperties.DatabaseProperties dbProps = properties.getDatabaseProperties();
        HikariDataSource dataSource = new HikariDataSource();
        dataSource.setDriverClassName(org.postgresql.Driver.class.getName());
        dataSource.setJdbcUrl(
            dbProps.getProtocol().concat("://")
                .concat(dbProps.getDbHost()).concat(":")
                .concat(dbProps.getDbPort()).concat("/")
                .concat(dbProps.getDbname())
        );
        dataSource.setUsername(dbProps.getUsername());
        dataSource.setPassword(dbProps.getPassword());
        dataSource.setMaximumPoolSize(30);
        dataSource.setMinimumIdle(30);

        return dataSource;
    }

    @Bean
    public SessionFactory sessionFactory(HibernateEntityManagerFactory hemf)   {
        return hemf.getSessionFactory();
    }
}

Log Repository Impl

@Repository
public class LogRepositoryImpl implements LogRepository {

    @Autowired
    private SessionFactory sessionFactory;

    @Override
    public List<Log> getLogs(int offset, int count) {
        Criteria criteria = getSession().createCriteria(Log.class);
        return criteria.setFirstResult(offset).setMaxResults(count).list();
    }

    @Override
    public void save(Log log) {
        getSession().save(log);
    }

    private Session getSession() {
        return sessionFactory.getCurrentSession();
    }
}

dataSource.setMaximumPoolSize（30），dataSource.setMinimumIdle（）;没有解决这个问题

Answer 1

听起来像是你的事务边界问题，而不是将连接释放回池。你能尝试把@Transactional放在你的LogRepositoryImpl课上吗？

@Repository
@Transactional
public class LogRepositoryImpl implements LogRepository {
    . . . 
}