IntelliJ 无法识别 Scala 中的 TypeTag

Question

I'm trying to compile these 2 lines of code in Scala (using Gradle):

import import scala.reflect.runtime.universe._
val typeInt = typeTag[Int]

It turns out somehow that IntelliJ mark the word runtime with the color red. and throw me this error: object runtime is not a member of package reflect one error found

Now, the weird thing for me, is when I'm using the Scala REPL, it finds this package without any issue .

scala> import scala.reflect.runtime.universe._
import scala.reflect.runtime.universe._

scala> val typeInt = typeTag[Int]
val typeInt: reflect.runtime.universe.TypeTag[Int] = TypeTag[Int]

---

Gradle's build.gradle file

plugins {
    id 'java-library'
    id 'scala'
    id 'com.github.maiflai.scalatest' version '0.26'
}

repositories {
    jcenter()
}

dependencies {
    implementation 'org.scala-lang:scala-library:2.13.3'
    implementation 'com.fasterxml.jackson.module:jackson-module-scala_2.13:2.9.9'
    implementation 'com.typesafe:config:1.4.0'
    testCompile 'org.scalamock:scalamock_2.13:4.4.0'
    testCompile 'org.scalatest:scalatest_2.13:3.1.2'
    testRuntimeOnly 'com.vladsch.flexmark:flexmark-all:0.35.10'
}

---

Versions

• IntelliJ IDEA - Community - Version 2020.2.3
• JDK - Version 14.0.1
• macOS Catalina - Version 10.15.7
• Scala - Version 2.13.3
• Gradle - Version 6.7

Answer 1

According to your build.gradle you didn't add scala-reflect dependency

https://mvnrepository.com/artifact/org.scala-lang/scala-reflect/2.13.3

scala-library is not enough if you want to use Scala reflection.

Try to add scala-reflect

implementation 'org.scala-lang:scala-reflect:2.13.3'