Exception when using "logging feature": "java.lang.IllegalStateException: Failed to find HttpClientEngineContainer in classpath via ServiceLoader"

[Karl O]

As erroneously opened in ktorio/ktor:867

Ktor Version

1.1.1

Ktor Engine Used(client or server and name)

io.ktor.server.netty.EngineMain

JVM Version, Operating System and Relevant Context

   openjdk version "1.8.0_192"
   OpenJDK Runtime Environment (build 1.8.0_192-b26)
   OpenJDK 64-Bit Server VM (build 25.192-b26, mixed mode)

OS: Linux 4.14.90-1-MANJARO

Feedback

I have created a completely fresh project using the IntelliJ Ktor-plugin's starter, only choosing "Logging feature" as additional features.

Starting the server without doing any changes gives me the following stack trace:

2019-01-13 16:51:11.390 [main] INFO  Application - No ktor.deployment.watch patterns specified, automatic reload is not active
Exception in thread "main" java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at kotlin.reflect.jvm.internal.calls.CallerImpl$Method.callMethod(CallerImpl.kt:71)
	at kotlin.reflect.jvm.internal.calls.CallerImpl$Method$Static.call(CallerImpl.kt:80)
	at kotlin.reflect.jvm.internal.KCallableImpl.callDefaultMethod$kotlin_reflect_api(KCallableImpl.kt:166)
	at kotlin.reflect.jvm.internal.KCallableImpl.callBy(KCallableImpl.kt:110)
	at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.callFunctionWithInjection(ApplicationEngineEnvironmentReloading.kt:347)
	at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.executeModuleFunction(ApplicationEngineEnvironmentReloading.kt:297)
	at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.instantiateAndConfigureApplication(ApplicationEngineEnvironmentReloading.kt:273)
	at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.createApplication(ApplicationEngineEnvironmentReloading.kt:126)
	at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.start(ApplicationEngineEnvironmentReloading.kt:245)
	at io.ktor.server.netty.NettyApplicationEngine.start(NettyApplicationEngine.kt:106)
	at io.ktor.server.netty.NettyApplicationEngine.start(NettyApplicationEngine.kt:18)
	at io.ktor.server.engine.ApplicationEngine$DefaultImpls.start$default(ApplicationEngine.kt:46)
	at io.ktor.server.netty.EngineMain.main(EngineMain.kt:17)
	at com.example.ApplicationKt.main(Application.kt:12)
Caused by: java.lang.ExceptionInInitializerError
	at com.example.ApplicationKt.module(Application.kt:27)
	at com.example.ApplicationKt.module$default(Application.kt:16)
	... 18 more
Caused by: java.lang.IllegalStateException: Failed to find HttpClientEngineContainer in classpath via ServiceLoader
	at io.ktor.client.HttpClientJvmKt.<clinit>(HttpClientJvm.kt:28)
	... 20 more

Removing this section in Application.kt:

val client = HttpClient() {
    install(Logging) {
        level = LogLevel.HEADERS
    }
}

Allows me to start the server successfully.

[Karl O]

Checking "Apache" in the wizard creates a runnable application. Which makes sense to me now that I understand the signature of io.ktor.client.HttpClient. But, it could probably be made more obvious in the wizard, same way that that the base-HttpClient is automatically selected when you select any of the features.

Feel free to close this as "user error".

[Sergey Mashkov]

For sure this is usability problem that need to be resolved somehow