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# help
s
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s
Only thing I could think of is I'm using docker, and my imagine isn't finding the ResponeTranformerV2 implementation file I had
t
WireMock shows the extensions it has loaded in its startup info, so I suggest checking whether yours is listed.
s
So then would I add my class that implements ResponseTransformerV2 into extensions at start up. Or am I misunderstanding how transformers work and I need to be loading a different extension
Still having issues getting my wiremock docker image to find my custom class. Is there any documentation on how this process works I haven't been able to find anything that's gotten me out of this blocker online. My current understanding is I copy into the /extension_dir folder and then call --extension filename
t
The 
--extension
parameter takes the class name, rather than the filename. But if your extension has the 
META-INF/services
file you don’t need that parameter at all. I suggest doing it this way. Are you using the official WireMock Docker image as your base?
s
Yes currently using latest wiremock docker image
t
OK, so putting your JAR file under 
/var/wiremock/extensions
inside the container should be sufficient on its own provided you’ve added the service file.
I’m going to update the README I think…
❤️ 1
README updated, if that’s any help at this point
s
Let me give it a look real quick
So if I'm writing my own extension how do I add the meta-inf services file so that this workflow is recognized
t
That’s the version to use if your extension uses ExtensionFactory. If you want to use the extension class directly, name the file: 
com.github.tomakehurst.wiremock.extension.Extension
s
So I need to use this grpc extension to have wiremock recognize my implementation of ResponseTransformerV2?
t
No, I’m just using it as an example of how extensions declare themselves
Basically you need to create a file in your source project: 
src/main/resources/META-INF/services/com.github.tomakehurst.wiremock.extension.Extension
and in this file put the fully-qualified name of your extension class.
❤️ 1
s
So I'm getting a java.util.serviceconfigurationerror that my extension class is not a subtype any idea what my last thing I'm doing wrong is?
wiremock-test | Exception in thread "main" java.util.ServiceConfigurationError: com.github.tomakehurst.wiremock.extension.ExtensionFactory: com.SiteControllerWiremockTransformer not a subtype
t
Is it a subclass of 
Extension
? If so, use 
com.github.tomakehurst.wiremock.extension.Extension
as the filename
s
Ya it's a subclass of extension. And I have the filename set as that now still getting this subtype issue
Got it working. Thank you so much!
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