Hi, When I’m trying to execute the test “WireMockContainerExtensionTest -> testJSONBodyTransformer”, I get an error:

...
Caused by: org.testcontainers.containers.ContainerLaunchException: Could not create/start container
	at org.testcontainers.containers.GenericContainer.tryStart(GenericContainer.java:553)
	at org.testcontainers.containers.GenericContainer.lambda$doStart$0(GenericContainer.java:344)
	at org.rnorth.ducttape.unreliables.Unreliables.retryUntilSuccess(Unreliables.java:81)
	... 23 more
Caused by: java.lang.IllegalStateException: Wait strategy failed. Container exited with code 1
	at org.testcontainers.containers.GenericContainer.tryStart(GenericContainer.java:523)
	... 25 more
Caused by: org.testcontainers.containers.ContainerLaunchException: Timed out waiting for URL to be accessible (<http://localhost:49189/__admin/mappings> should return HTTP [200])
	at org.testcontainers.containers.wait.strategy.HttpWaitStrategy.waitUntilReady(HttpWaitStrategy.java:320)
	at org.testcontainers.containers.wait.strategy.AbstractWaitStrategy.waitUntilReady(AbstractWaitStrategy.java:52)
	at org.testcontainers.containers.GenericContainer.waitUntilContainerStarted(GenericContainer.java:964)
	at org.testcontainers.containers.GenericContainer.tryStart(GenericContainer.java:490)
	... 25 more
...

It seems that the container is failing. The container logs look like this:

Exception in thread "main" java.lang.ClassNotFoundException: com.ninecookies.wiremock.extensions.JsonBodyTransformer
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
	at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Unknown Source)
	at com.github.tomakehurst.wiremock.extension.ExtensionLoader$3.apply(ExtensionLoader.java:71)
	at com.github.tomakehurst.wiremock.extension.ExtensionLoader$3.apply(ExtensionLoader.java:67)
	at wiremock.com.google.common.collect.Iterators$6.transform(Iterators.java:829)
	at wiremock.com.google.common.collect.TransformedIterator.next(TransformedIterator.java:52)
	at wiremock.com.google.common.collect.TransformedIterator.next(TransformedIterator.java:52)
	at wiremock.com.google.common.collect.Maps.uniqueIndex(Maps.java:1391)
	at wiremock.com.google.common.collect.Maps.uniqueIndex(Maps.java:1353)
	at com.github.tomakehurst.wiremock.extension.ExtensionLoader.asMap(ExtensionLoader.java:40)
	at com.github.tomakehurst.wiremock.extension.ExtensionLoader.loadExtension(ExtensionLoader.java:32)
	at com.github.tomakehurst.wiremock.extension.ExtensionLoader.load(ExtensionLoader.java:36)
	at com.github.tomakehurst.wiremock.standalone.CommandLineOptions.buildExtensions(CommandLineOptions.java:378)
	at com.github.tomakehurst.wiremock.standalone.CommandLineOptions.<init>(CommandLineOptions.java:369)
	at com.github.tomakehurst.wiremock.standalone.WireMockServerRunner.run(WireMockServerRunner.java:49)
	at com.github.tomakehurst.wiremock.standalone.WireMockServerRunner.main(WireMockServerRunner.java:133)

Maybe I’m doing something wrong? To be honest, I’m not sure how this is working and what is expected…

Hi! Did you initialize the extension?

Ok, I see. Now all tests are running green. Thank you very much! I suspected all tests were running out of the box…

They will do so if you use maven. If you use IDEs like IDEA they don't always implement all Maven calls as needed