接收器 class 未定义或继承已解析方法的实现 'abstract boolean getDevelopmentMode()'

Question

我正在尝试运行使用 KTOR 的本地服务器并用测试覆盖它。我写了一些代码，在写了一些测试之后，测试成功地启动了本地服务器并通过了。但是，如果我尝试启动本地服务器，则会出现此错误

Exception in thread "main" java.lang.AbstractMethodError: Receiver class io.ktor.server.engine.ApplicationEngineEnvironmentReloading does not define or inherit an implementation of the resolved method 'abstract boolean getDevelopmentMode()' of interface io.ktor.application.ApplicationEnvironment.

我附上下面的代码和堆栈跟踪

server.kt

import io.ktor.application.*
import io.ktor.features.*
import io.ktor.gson.*
import io.ktor.http.*
import io.ktor.response.*
import io.ktor.routing.*
import kotlinx.serialization.SerialName
import kotlinx.serialization.Serializable


fun main(args: Array<String>): Unit = io.ktor.server.netty.EngineMain.main(args)

fun Application.module(testing: Boolean = false) {
    install(ContentNegotiation) {
        gson()
    }

    routing {
        val controller = Controller()

        get("/converter{from}{to}") {
            try {
                val fromCurrency = call.request.queryParameters["from"]
                val toCurrency = call.request.queryParameters["to"]
                val rate = controller.converter(fromCurrency, toCurrency)
                val response = Response(
                    "1 $fromCurrency = $rate $toCurrency",
                    null
                )
                call.respond(HttpStatusCode.OK, response)
            } catch (e: ControllerException) {
                val response = Response(
                    null,
                    e.message
                )
                call.respond(HttpStatusCode.BadRequest, response)
            }
        }

        get {
            call.respond(HttpStatusCode.NotFound, Response())
        }
    }
}

@Serializable
data class Response(
    @SerialName("converterResponse")
    val converterResponse: String? = null,
    @SerialName("errorMessage")
    val errorMessage: String? = null
)

converterTest.kt

import com.google.gson.Gson
import io.ktor.application.*
import io.ktor.http.*
import io.ktor.server.testing.*
import kotlin.test.Test
import kotlin.test.assertEquals

class ConverterTest {
    @Test
    fun `Identical Correct Currencies`() {
        withTestApplication(Application::module) {
            handleRequest(HttpMethod.Get, "/converter?from=USD&to=USD").apply {
                assertEquals(HttpStatusCode.OK, response.status())
                val expectedResponse = Response("1 USD = 1 USD")
                assertEquals(
                    Gson().toJson(expectedResponse),
                    response.content
                )
            }
        }
    }
}

堆栈跟踪

Exception in thread "main" java.lang.AbstractMethodError: Receiver class io.ktor.server.engine.ApplicationEngineEnvironmentReloading does not define or inherit an implementation of the resolved method 'abstract boolean getDevelopmentMode()' of interface io.ktor.application.ApplicationEnvironment.
at io.ktor.application.Application.<init>(Application.kt:20)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.instantiateAndConfigureApplication(ApplicationEngineEnvironmentReloading.kt:269)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.createApplication(ApplicationEngineEnvironmentReloading.kt:125)
at io.ktor.server.engine.ApplicationEngineEnvironmentReloading.start(ApplicationEngineEnvironmentReloading.kt:245)
at io.ktor.server.netty.NettyApplicationEngine.start(NettyApplicationEngine.kt:126)
at io.ktor.server.netty.EngineMain.main(EngineMain.kt:26)
at ServerKt.main(server.kt:11)

build.gradle

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    kotlin("jvm") version "1.5.30" // or kotlin("multiplatform") or any other kotlin plugin
    application
}

group = "me.admin"
version = "1.0-SNAPSHOT"

repositories {
    jcenter()
    mavenCentral()
    maven { url = uri("https://dl.bintray.com/kotlin/kotlinx") }
    maven { url = uri("https://dl.bintray.com/kotlin/ktor") }
}

dependencies {
    val kotlin_version = "1.5.30"
    val ktor_version = "1.6.3"

    implementation("io.ktor:ktor-server-netty:1.4.0")
    implementation("io.ktor:ktor-client-cio:1.4.0")
    implementation("io.ktor:ktor-html-builder:1.4.0")
    implementation("io.ktor:ktor-client-serialization:1.3.2-1.4-M2")
    implementation("org.jetbrains.kotlinx:kotlinx-html-jvm:0.7.2")
    implementation("org.slf4j:slf4j-api:2.0.0-alpha5")

    implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:1.0.0-RC")
    implementation(kotlin("stdlib-jdk8"))
    testImplementation("org.jetbrains.kotlin:kotlin-test:$kotlin_version")
    testImplementation("io.ktor:ktor-server-test-host:$ktor_version")
    implementation("io.ktor:ktor-gson:$ktor_version")
}

tasks.test {
    useJUnitPlatform()
}

tasks.withType<KotlinCompile> {
    kotlinOptions.jvmTarget = "1.8"
}

application {
    mainClassName = "ServerKt"
}
val compileKotlin: KotlinCompile by tasks
compileKotlin.kotlinOptions {
    jvmTarget = "1.8"
}
val compileTestKotlin: KotlinCompile by tasks
compileTestKotlin.kotlinOptions {
    jvmTarget = "1.8"
}

Answer 1

依赖项 io.ktor:ktor-server-netty:1.4.0 导致 AbstractMethodError。要修复它，只需对所有 Ktor 依赖项使用相同的版本：

implementation("io.ktor:ktor-server-netty:$ktor_version")
implementation("io.ktor:ktor-client-cio:$ktor_version")
implementation("io.ktor:ktor-html-builder:$ktor_version")
implementation("io.ktor:ktor-client-serialization:$ktor_version")

接收器 class 未定义或继承已解析方法的实现 'abstract boolean getDevelopmentMode()'

Receiver class does not define or inherit an implementation of the resolved method 'abstract boolean getDevelopmentMode()'

kotlin

testing

gradle

ktor

localserver

server.kt

converterTest.kt

堆栈跟踪

build.gradle