import javax.net.ssl.SSLParameters;
import java.net.http.HttpClient;

public class Reprod {
    public static void main(String[] args) {
        final var sslParams = new SSLParameters();
        sslParams.setNeedClientAuth(true);

        final var httpClient = HttpClient.newBuilder().sslParameters(sslParams).build();
        if (!httpClient.sslParameters().getNeedClientAuth()) {
            throw new RuntimeException();
        }
    }

}