SOAPUI数据库连接错误[本地端口127.0.0.1:4321无法绑定]

Question

本地端口127.0.0.1:4321无法绑定，请参阅下面的代码了解详细信息，请注意我使用的是lport - 4321.我是否需要使用不同的东西？如果是，我怎么能找到一个？

package mypackage
import groovy.sql.Sql
import java.sql.*
import com.jcraft.jsch.JSch
import com.jcraft.jsch.Session


// ssh login
String sshHost = 'abc.com'
String sshUser = 'test'
String sshPass = 'test'
int sshPort = 22
String boundaddress ="0.0.0.0";
// database login
targetHost = 'localhost'
targetUser = 'test'
targetPass = 'test'
targetPort = 3306
lport = 4321

JSch jsch = new JSch();
Session session = jsch.getSession(sshUser, sshHost, sshPort);
session.setPassword(sshPass);
session.setConfig("StrictHostKeyChecking", "no");
System.out.println("Establishing Connection...");
session.connect();
int assinged_port=session.setPortForwardingL(lport, targetHost, targetPort);

Connection con = null;
String driver = "org.mariadb.jdbc.Driver";
String connectionString = "jdbc:mariadb://" + targetHost +":" + lport + "/";
con = DriverManager.getConnection(connectionString, targetUser, targetPass);
Statement st = con.createStatement();
String sql = "select * company "
st.execute(sql);