java - 了解密码更改时的 tomcat-jdbc 池行为

Question

在以下代码中（根据 tomcat-jdbc 站点中给出的示例代码进行更改），我首先使用正确的用户名和密码创建连接池。一段时间后，我将用户名和密码更改为错误的，但仍然连接成功。我已经设置了testOnBorrow在true发出连接时应该测试连接的位置。有人可以解释为什么代码在发出连接时不检查密码吗？

我的代码

PoolProperties p = new PoolProperties();
    p.setUrl("myurl");
    p.setDriverClassName("oracle.jdbc.driver.OracleDriver");
    p.setUsername("test");
    p.setPassword("bsc");
    p.setJmxEnabled(true);
    p.setTestWhileIdle(false);
    p.setTestOnBorrow(true);
    p.setValidationQuery("SELECT 1");
    p.setTestOnReturn(true);
    p.setValidationInterval(30000);
    p.setTimeBetweenEvictionRunsMillis(30000);
    p.setMaxActive(100);
    p.setInitialSize(10);
    p.setMaxWait(1000);
    p.setRemoveAbandonedTimeout(60);
    p.setMinEvictableIdleTimeMillis(30000);
    p.setMinIdle(10);
    p.setLogAbandoned(true);
    p.setRemoveAbandoned(true);
    p.setJdbcInterceptors(
            "org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;" +
                    "org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer");
    DataSource datasource = new DataSource();
    datasource.setPoolProperties(p);
    datasource.getPoolProperties().setUsername("Correct");
    datasource.getPoolProperties().setPassword("Correct");

    for (int i = 0; i < 1000; i++) {

        if (i == 6) {
            System.out.println("Updating wrong user.");
            datasource.getPoolProperties().setUsername("Wrong");
            datasource.getPoolProperties().setPassword("Wrong");
        }
        Connection con = null;
        try {
            System.out.println("Creating connection - " + i);
            con = datasource.getConnection();
            System.out.println("Done. connection status is open " + con.isClosed());
            Statement st = con.createStatement();
            ResultSet rs = st.executeQuery(select);
            int cnt = 1;
            while (rs.next()) {
                System.out.println((cnt++) + ". Host:" + rs.getString(1));
            }
            rs.close();
            st.close();
            System.out.println("Done - \n");
        } finally {
            if (con != null) try {
                con.close();
            } catch (Exception ignore) {
            }
        }