Localhost connection refused when integrating WireMock and JMeter

I'm trying to integrate Wiremock into a Jmeter test plan so that every time I execute the test plan it will start up an instance of WireMock in the beginning and then run tests I have outlined. I followed this answer (https://stackoverflow.com/a/49130518/12912945) but the problem I am having is that I always get the error:

Response message:Non HTTP response message: Connect to localhost:8080 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect

From what I can see, the Wiremock server never starts even though I have the following code in a JSR223 Sampler at the beginning of the test plan:

import com.github.tomakehurst.wiremock.WireMockServer;
import com.github.tomakehurst.wiremock.stubbing.StubMapping;
import static com.github.tomakehurst.wiremock.client.WireMock.*;

public class WireMockTest {

    public static void main(String[] args) {
        WireMockServer wireMockServer = new WireMockServer();
        configureFor("127.0.0.1", 8080);
        wireMockServer.start();
        StubMapping foo = stubFor(get(urlEqualTo("/some/thing"))
                .willReturn(aResponse()
                        .withStatus(200)
                        .withBody("Hello World")));
        wireMockServer.addStubMapping(foo);
    }
}

Could anyone point me in the right direction of how to correctly integrate the two, I have tried adding to the classpath but I feel like I have not done this correctly or I'm missing something

Thank you!