c3p0运行失败，报错如下

package com.imooc.jdbc.sample;

import com.imooc.jdbc.common.DbUtils;
import com.mchange.v2.c3p0.ComboPooledDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class C3P0Sample {
    public static void main(String[] args) {
        // 1、加载配置文件
        // 2、创建DataSource数据源
        DataSource dataSource = new ComboPooledDataSource();
        // 3、得到数据库连接
        Connection conn = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        try {
            conn = dataSource.getConnection();
            pstmt = conn.prepareStatement("select * from employee limit 0,10");
            rs = pstmt.executeQuery();
            while (rs.next()) {
                Integer eno = rs.getInt("eno");
                String ename = rs.getString("ename");
                Float salary = rs.getFloat("salary");
                String dname = rs.getString("dname");
                System.out.println(eno + "-" + ename + "-" + salary + "-" + dname);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            DbUtils.closeConnection(rs, pstmt, conn);
        }

    }
}

警告: com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@607e5cf3 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:

java.sql.SQLException: No suitable driver

at java.sql.DriverManager.getDriver(DriverManager.java:315)

at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:285)

at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:161)

at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:161)

at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:147)

at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:202)

at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1176)

at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1163)

at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44)

at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1908)

at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)

八月 18, 2023 4:15:23 下午 com.mchange.v2.resourcepool.BasicResourcePool

警告: Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@b684286 is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests.

java.sql.SQLException: Connections could not be acquired from the underlying database!

at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:118)

at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:692)

at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:140)

at com.imooc.jdbc.sample.C3P0Sample.main(C3P0Sample.java:22)

Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.

at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1507)

at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:644)

at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:554)

at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:758)

at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:685)

... 2 more

Caused by: java.sql.SQLException: No suitable driver