如何解决测试Akka actor时,我收到错误消息:MyActor上找不到匹配的构造函数
我正在为Akka演员创建测试,由于某种原因,它不允许我创建演员。它引发一条消息,提示no matching constructor found on class SimpleActor
。在基于Akka版本2.4.x的on this issue上,这似乎是一个错误,但是我使用的是更新版本。我正在使用以下build.sbt
:
name := """explore-akka"""
version := "1.1"
scalaVersion := "2.12.7"
val akkaVersion = "2.6.10"
val scalaBinVersion = "2.12"
val scalaTestVersion = "3.2.2"
libraryDependencies ++= Seq(
"com.typesafe.akka" %% "akka-actor" % akkaVersion,"com.typesafe.akka" %% "akka-testkit" % akkaVersion,"org.scalatest" %% "scalatest" % scalaTestVersion
)
mainClass in Compile := Some("org.github.felipegutierrez.explore.akka.MainClass")
enablePlugins(JavaAppPackaging)
enablePlugins(DockerPlugin)
dockerUsername := Some("felipeogutierrez")
和Scala中的以下测试类:
package org.github.felipegutierrez.explore.akka.tests
import akka.actor.{Actor,ActorSystem,Props}
import akka.testkit.{ImplicitSender,TestKit}
import org.scalatest.BeforeAndAfterall
import org.scalatest.wordspec.AnyWordSpecLike
class BasicSpec extends TestKit(ActorSystem())
with ImplicitSender with AnyWordSpecLike with BeforeAndAfterall {
override def afterall(): Unit = {
TestKit.shutdownActorSystem(system)
}
import BasicSpec._
"a simple actor" should {
"send back the same message" in {
val echoActor = system.actorOf(Props[SimpleActor])
val message = "hello,test"
echoActor ! message
expectMsg(message)
}
}
object BasicSpec {
class SimpleActor extends Actor {
override def receive: Receive = {
case message => sender() ! message
}
}
}
}
我也尝试了val echoActor = system.actorOf(Props[SimpleActor],name = "SimpleActor")
和val echoActor = TestActorRef(Props[SimpleActor])
,但是我一直收到此错误:
no matching constructor found on class org.github.felipegutierrez.explore.akka.tests.BasicSpec$BasicSpec$SimpleActor for arguments []
java.lang.IllegalArgumentException: no matching constructor found on class org.github.felipegutierrez.explore.akka.tests.BasicSpec$BasicSpec$SimpleActor for arguments []
at akka.util.Reflect$.error$1(Reflect.scala:89)
at akka.util.Reflect$.findConstructor(Reflect.scala:113)
at akka.actor.NoArgsReflectConstructor.<init>(IndirectActorProducer.scala:108)
at akka.actor.IndirectActorProducer$.apply(IndirectActorProducer.scala:63)
at akka.actor.Props.producer(Props.scala:131)
at akka.actor.Props.<init>(Props.scala:144)
at akka.actor.Props$.apply(Props.scala:62)
at org.github.felipegutierrez.explore.akka.tests.BasicSpec.$anonfun$new$2(BasicSpec.scala:20)
at org.scalatest.OutcomeOf.outcomeOf(OutcomeOf.scala:85)
at org.scalatest.OutcomeOf.outcomeOf$(OutcomeOf.scala:83)
at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
at org.scalatest.Transformer.apply(Transformer.scala:22)
at org.scalatest.Transformer.apply(Transformer.scala:20)
at org.scalatest.wordspec.AnyWordSpecLike$$anon$3.apply(AnyWordSpecLike.scala:1076)
at org.scalatest.TestSuite.withFixture(TestSuite.scala:196)
at org.scalatest.TestSuite.withFixture$(TestSuite.scala:195)
at org.github.felipegutierrez.explore.akka.tests.BasicSpec.withFixture(BasicSpec.scala:8)
at org.scalatest.wordspec.AnyWordSpecLike.invokeWithFixture$1(AnyWordSpecLike.scala:1074)
at org.scalatest.wordspec.AnyWordSpecLike.$anonfun$runTest$1(AnyWordSpecLike.scala:1086)
at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306)
at org.scalatest.wordspec.AnyWordSpecLike.runTest(AnyWordSpecLike.scala:1086)
at org.scalatest.wordspec.AnyWordSpecLike.runTest$(AnyWordSpecLike.scala:1068)
at org.github.felipegutierrez.explore.akka.tests.BasicSpec.runTest(BasicSpec.scala:8)
at org.scalatest.wordspec.AnyWordSpecLike.$anonfun$runTests$1(AnyWordSpecLike.scala:1145)
at org.scalatest.SuperEngine.$anonfun$runTestsInBranch$1(Engine.scala:413)
at scala.collection.immutable.List.foreach(List.scala:388)
at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401)
at org.scalatest.SuperEngine.runTestsInBranch(Engine.scala:390)
at org.scalatest.SuperEngine.$anonfun$runTestsInBranch$1(Engine.scala:427)
at scala.collection.immutable.List.foreach(List.scala:388)
at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:401)
at org.scalatest.SuperEngine.runTestsInBranch(Engine.scala:396)
at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:475)
at org.scalatest.wordspec.AnyWordSpecLike.runTests(AnyWordSpecLike.scala:1145)
at org.scalatest.wordspec.AnyWordSpecLike.runTests$(AnyWordSpecLike.scala:1144)
at org.github.felipegutierrez.explore.akka.tests.BasicSpec.runTests(BasicSpec.scala:8)
at org.scalatest.Suite.run(Suite.scala:1112)
at org.scalatest.Suite.run$(Suite.scala:1094)
at org.github.felipegutierrez.explore.akka.tests.BasicSpec.org$scalatest$wordspec$AnyWordSpecLike$$super$run(BasicSpec.scala:8)
at org.scalatest.wordspec.AnyWordSpecLike.$anonfun$run$1(AnyWordSpecLike.scala:1190)
at org.scalatest.SuperEngine.runImpl(Engine.scala:535)
at org.scalatest.wordspec.AnyWordSpecLike.run(AnyWordSpecLike.scala:1190)
at org.scalatest.wordspec.AnyWordSpecLike.run$(AnyWordSpecLike.scala:1188)
at org.github.felipegutierrez.explore.akka.tests.BasicSpec.org$scalatest$BeforeAndAfterall$$super$run(BasicSpec.scala:8)
at org.scalatest.BeforeAndAfterall.liftedTree1$1(BeforeAndAfterall.scala:213)
at org.scalatest.BeforeAndAfterall.run(BeforeAndAfterall.scala:210)
at org.scalatest.BeforeAndAfterall.run$(BeforeAndAfterall.scala:208)
at org.github.felipegutierrez.explore.akka.tests.BasicSpec.run(BasicSpec.scala:8)
at org.scalatest.tools.SuiteRunner.run(SuiteRunner.scala:45)
at org.scalatest.tools.Runner$.$anonfun$doRunRunRunDaDoRunRun$13(Runner.scala:1320)
at org.scalatest.tools.Runner$.$anonfun$doRunRunRunDaDoRunRun$13$adapted(Runner.scala:1314)
at scala.collection.immutable.List.foreach(List.scala:388)
at org.scalatest.tools.Runner$.doRunRunRunDaDoRunRun(Runner.scala:1314)
at org.scalatest.tools.Runner$.$anonfun$runoptionallyWithPassFailReporter$24(Runner.scala:993)
at org.scalatest.tools.Runner$.$anonfun$runoptionallyWithPassFailReporter$24$adapted(Runner.scala:971)
at org.scalatest.tools.Runner$.withClassLoaderAnddispatchReporter(Runner.scala:1480)
at org.scalatest.tools.Runner$.runoptionallyWithPassFailReporter(Runner.scala:971)
at org.scalatest.tools.Runner$.run(Runner.scala:798)
at org.scalatest.tools.Runner.run(Runner.scala)
at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.runScalaTest2or3(ScalaTestRunner.java:40)
at org.jetbrains.plugins.scala.testingSupport.scalaTest.ScalaTestRunner.main(ScalaTestRunner.java:27)
更新:更奇怪的是,当我使用the official doc中的以下测试时,它可以工作!但是,当我将相同的代码从TestActors.echoActorProps
复制到我的SimpleActor时,它不起作用。
"An Echo actor" must {
"send back messages unchanged" in {
val echo = system.actorOf(TestActors.echoActorProps)
echo ! "hello world"
expectMsg("hello world")
}
}
解决方法
我更改了library(tidyverse)
sample_points %>%
mutate(from = map2(from,to,seq,by = 'year')) %>%
unnest(from) %>%
group_by(point) %>%
mutate(to = lead(from)) %>%
filter(!is.na(to))
# point from to label
# <chr> <date> <date> <chr>
#1 1 2004-05-01 2005-05-01 cropland
#2 1 2005-05-01 2006-05-01 cropland
#3 1 2006-05-01 2007-05-01 cropland
#4 2 2009-05-01 2010-05-01 grassland
#5 2 2010-05-01 2011-05-01 grassland
#6 2 2011-05-01 2012-05-01 grassland
#7 3 2014-05-01 2015-05-01 forest
#8 3 2015-05-01 2016-05-01 forest
的实现,并且成功了。我不确定为什么即使我从official documentation实现了相同的代码也无法正常工作。完整的代码如下:
val propsSimpleActor = {Props(new SimpleActor)}
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。