Oracle JDBC PoolDataSource不发布DB游标？

Question

我正在使用从Connection获得的oracle.ucp.jdbc.PoolDataSource执行查询。当关闭数据库资源时，只有当池重用连接或JVM退出时，似乎这些查询打开的数据库游标才会关闭。

我正在通过运行以下查询来检查打开的游标。

select SQL_TEXT, v$open_cursor .* from v$open_cursor 
where 
user_name = 'ME'
AND 
CURSOR_TYPE = 'OPEN'

当代码到达第一次休眠时，查询在第二次休息时返回select 1 from dual a，select 1 from dual b等等......一旦JVM退出我的查询，就不会返回任何结果。

因此，在执行另一个查询或JVM退出之前，游标似乎保持打开状态。关闭statement / connection / resultSet时，我如何确保游标可靠关闭？

    pooledDataSource.setConnectionFactoryClassName("oracle.jdbc.pool.OracleDataSource");
    pooledDataSource.setURL("jdbc:oracle:thin:@//" + host + ":1521/" + service);
    pooledDataSource.setUser(user);
    pooledDataSource.setPassword(pw);
    pooledDataSource.setInitialPoolSize(1);
    pooledDataSource.setMinPoolSize(1);
    pooledDataSource.setMaxPoolSize(1);
    pooledDataSource.setAbandonedConnectionTimeout(60);
    pooledDataSource.setConnectionWaitTimeout(60);
    pooledDataSource.setInactiveConnectionTimeout(60);


    try (Connection con = pooledDataSource.getConnection();
            PreparedStatement statement = con.prepareStatement("select 1 from dual a");
            ResultSet rs = statement.executeQuery()) {
        System.out.println();
    }

    System.out.println("opened a");
    Thread.sleep(5000);

    try (Connection con = pooledDataSource.getConnection();
            PreparedStatement statement = con.prepareStatement("select 1 from dual b");
            ResultSet rs = statement.executeQuery()) {
        System.out.println();
    }

    System.out.println("opened b");
    Thread.sleep(5000);

    try (Connection con = pooledDataSource.getConnection();
            PreparedStatement statement = con.prepareStatement("select 1 from dual c");
            ResultSet rs = statement.executeQuery()) {
        System.out.println();
    }

    System.out.println("opened c");
    Thread.sleep(5000);