How to connent to Oracle database with SSH in IntelliJ IDEA

I'm trying to configure the data source using SSH to access the Database from IntelliJ off-campus. The configuration is as shown in the screenshots, and I got
>[08006][17002] IO Error: Got minus one from a read call, connect lapse 30003 ms., Authentication lapse 0 ms. oracle.net.ns.NetException: Got minus one from a read call.

In fact, I've succeeded to connect to the DB with the loginProxy() and loginDB() in a Java program. From running the code, I knew that the jdbcPort should be dynamic, and I assume that's also what should be filled in the "Port" blank in the "General" tab in "Data Source and Drivers" configuration window.

So here comes the problem, how can I configure it if the Port to be filled in is DYNAMIC? Or did I get anything wrong so that actually there should be another approach?

An additional question: String URL = "jdbc:oracle:thin:@" + jdbcHost + ":" + jdbcPort + "/" + database; What URL format is used here? It doesn't look like SID, Service Name, or TNS, but it does work... and it's funny that when I substitute the "/" with ":", which matches the SID format, it doesn't work anymore...

	/**
	 * Login the proxy. Do not change this function.
	 * 
	 * @return boolean
	 */
	public boolean loginProxy() {
		if (getYESorNO("Using ssh tunnel or not?")) { // if using ssh tunnel
			String[] namePwd = getUsernamePassword("Login cs lab computer");
			String sshUser = namePwd[0];
			String sshPwd = namePwd[1];
			try {
				proxySession = new JSch().getSession(sshUser, proxyHost, proxyPort);
				proxySession.setPassword(sshPwd);
				Properties config = new Properties();
				config.put("StrictHostKeyChecking", "no");
				proxySession.setConfig(config);
				proxySession.connect();
				proxySession.setPortForwardingL(forwardHost, 0, databaseHost, databasePort);
				forwardPort = Integer.parseInt(proxySession.getPortForwardingL()[0].split(":")[0]);
                // 👆 forwardPort is set here, seems to be dynamic...
			} catch (JSchException e) {
				e.printStackTrace();
				return false;
			}
			jdbcHost = forwardHost;  // 👈 this is used in case of SSH connection, which is "localhost"
			jdbcPort = forwardPort;  // 👈 this is used in case of SSH connection
		} else {
			jdbcHost = databaseHost;
			jdbcPort = databasePort;
		}
		return true;
	}

	/**
	 * Login the oracle system. Change this function under instruction.
	 * 
	 * @return boolean
	 */
	public boolean loginDB() {
		String username = "myDBUsername";
		String password = "myDBPassword";
		
		/* Do not change the code below */

		String URL = "jdbc:oracle:thin:@" + jdbcHost + ":" + jdbcPort + "/" + database;

		try {
			System.out.println("Logging " + URL + " ...");
			conn = DriverManager.getConnection(URL, username, password);
			return true;
		} catch (SQLException e) {
			e.printStackTrace();
			return false;
		}
	}

On general tab you need to specify real db server hostname and port, not localhost. With configured SSH tunnel on next tab all the things for connection will be done automatically.