What's wrong with this reqHistoricalData() call?

This is preliminary and trying to send a hist data request and see what comes back.
It is not wrapped in a thread and no loop.

What's wrong with it? Is there something wrong with my request? The `historicalData()` callback is never entered.

Code:

import com.ib.client.*;
import java.util.concurrent.TimeUnit;

public class HistoricalDataDownloader implements EWrapper {
    
    private EJavaSignal javaSignal = new EJavaSignal();
    private EClientSocket mySocket = new EClientSocket(this, javaSignal); 

    private Contract contract = new Contract(); //Contract obj
    private String ticker = "MSFT"; //stock ticker
    private String reqEndDateTime = "20240617 16:00:00";  
    private String reqLookbackWindow = "1 D"; 
    private PriceDataType reqDataType = PriceDataType.TRADES; 
    private String reqBarSize = "2 hrs"; //data granularity 
    
     public static void main (String[] args) {

        HistoricalDataDownloader myDownloader = new HistoricalDataDownloader();
        myDownloader.openConnection();
        System.out.println( "Connected to TWS: " + myDownloader.mySocket.isConnected() );

        myDownloader.request();

        try { //pause a bit after request
            System.out.println("Am going to sleep");
            TimeUnit.SECONDS.sleep(8);
            System.out.println("bye");
        } catch (InterruptedException err) {
            System.out.println("interrupted");
        }

    }

    private enum PriceDataType {
        BID, 
        ASK,
        TRADES
    }

    /*
    @see: https://ibkrcampus.com/ibkr-api-page/twsapi-doc/#requesting-historical-bars
    */
    private void request() {
        this.setContract();
        this.mySocket.reqHistoricalData(1, this.contract, this.reqEndDateTime, this.reqLookbackWindow, this.reqBarSize, this.reqDataType.name(), 1, 1, false, null);
    }

    /*
    @see: https://ibkrcampus.com/ibkr-api-page/twsapi-ref/#ewrapper-pub-func
    */
    @Override
    public void historicalData(int reqId, Bar candlestick) {
        System.out.println("I am inside the receiver callback");
    }

    public void historicalDataEnd(int reqId, String startDateStr, String endDateStr) {
    }
    
    private void openConnection() { 
        this.mySocket.eConnect("127.0.0.1", 7496, 0);
    }

    private void closeConnection() { 
        this.mySocket.eDisconnect();
    }

    private void setContract() {
        this.contract.symbol(this.ticker);
        this.contract.secType("STK");
        this.contract.currency("USD");
        this.contract.exchange("SMART"); 
    }

 

It seems I completely missed this EReader thing

 

You need to define the historicalData() routine as the callback. I don't see this being done anywhere in the code.