Test.java

import java.net.URL;
import java.net.URLClassLoader;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.SQLException;
import java.util.Properties;

public class Test {

    private static void tryConnect(Properties props, String... libs) throws ClassNotFoundException, InstantiationException, IllegalAccessException, SQLException {
        URL[] cp = new URL[libs.length];
        ClassLoader threadClassLoader = Thread.currentThread().getContextClassLoader();
        for (int i = 0; i < cp.length; i++) {
            cp[i] = threadClassLoader.getClass().getResource(libs[i]);
        }
        URLClassLoader classLoader = new URLClassLoader(cp, threadClassLoader);

        Class driverClass = classLoader.loadClass(props.getProperty("driverClass"));
        Driver driver = (Driver) driverClass.newInstance();
        Connection conn = driver.connect(props.getProperty("url"), props);
        System.out.println(conn.getMetaData().getDatabaseProductVersion());
    }

    public static void main(String[] args) throws Exception {
        final int N = 10;
        Thread[] m8s = new Thread[N];
        Thread[] m5s = new Thread[N];

        for (int i = 0; i < N; i++) {
            m5s[i] = new Thread(() -> {
                try {
                    Properties props = new Properties();
                    props.setProperty("user", "root");
                    props.setProperty("password", "123");
                    props.setProperty("url", "jdbc:mysql://localhost:3305?autoReconnect=true&useSSL=false");
                    props.setProperty("driverClass", "com.mysql.jdbc.Driver");
                    tryConnect(props,
                            "/lib/mysql5/mysql-connector-java-5.1.34.jar");
                } catch (Exception ignored) {

                }
            });

            m8s[i] = new Thread(() -> {
                try {
                    Properties props = new Properties();
                    props.setProperty("user", "root");
                    props.setProperty("password", "123");
                    props.setProperty("url", "jdbc:mysql://localhost:3308?autoReconnect=true&useSSL=false");
                    props.setProperty("driverClass", "com.mysql.cj.jdbc.Driver");
                    tryConnect(props,
                            "/lib/mysql8/mysql-connector-java-8.0.11.jar",
                            "/lib/mysql8/protobug-java-2.6.0");
                } catch (Exception ignored) {

                }
            });
        }

        for (int i = 0; i < N; i++) {
            m8s[i].start();
            m5s[i].start();
        }

    }
}