hibernate和c3p0 PooledConnection在数据库重新启动后不续订连接

我正在将hibernate与c3p0一起使用,一旦数据库重新启动,应用程序就会因以下错误而中断:

[warn] [com.mchange.v2.c3p0.impl.NewPooledConnection] [c3p0] A PooledConnection that has already signalled a Connection error is still in use!
[warn] [com.mchange.v2.c3p0.impl.NewPooledConnection] [c3p0] Another error has occurred [ java.sql.SQLRecoverableException: Closed Connection ] which will not be reported to listeners!: java.sql.SQLRecoverableException: Closed Connection

在 TypedQuery.getSingleResult() .

我必须重新启动应用程序才能修复它。

然而 EntityManager 是这样创建的单例Bean:

LocalContainerEntityManagerFactoryBean entityManagerFactory = new LocalContainerEntityManagerFactoryBean();

ComboPooledDataSource cpds = new ComboPooledDataSource();
cpds.setDriverClass(driverClassName);
cpds.setJdbcUrl(url);
cpds.setUser(user);
cpds.setPassword(password);
cpds.setPreferredTestQuery("SELECT 1 FROM dual");
cpds.setIdleConnectionTestPeriod(20);
cpds.setInitialPoolSize(0);
cpds.setMinPoolSize(0);
cpds.setMaxPoolSize(20);
cpds.setTestConnectionOnCheckin(true);

entityManagerFactory.setDataSource(cpds);

我不明白为什么数据库重新启动后,连接从未被池替换。

有人知道我使用c3p0的方式有什么问题吗?