The problem is that there are no extension of type HttpServerFactory.class found. Do I have to configure this extensions?

You are using the jetty 12 version of WireMock. Do you have jetty 12 on your classpath (via something like Spring 3.x.x or some other means) If not you could just try the jetty 11 version of WireMock:

<dependency>
   <groupId>org.wiremock</groupId>
   <artifactId>wiremock</artifactId>
   <version>3.10.0</version>
   <scope>test</scope>     
</dependency>

I was having the same issue, instead of using the

wiremock-3.10.0

use the

wiremock-jetty12:3.10.0

instead, that solved the issue for me.

Hi. I think your issue was the other way round. Andi was already using the jetty 12 jar so that must mean jetty 12 wasn’t on the classpath for them whereas is was for you.