error: cannot find symbol in gradle compileTestJava

问题

I am getting lots of error: cannot find symbol errors when the compileTestJava task runs in my Gradle project.

My code is in src/main/java and my tests are in src/test/java and the test classes cannot resolve any classes in src/main/java

e.g.:

C:\q\src\test\java\q\MainTest.java:14: error: cannot find symbol
            Main.main(new String[0]);
            ^
  symbol:   variable Main
  location: class MainTest

But q\src\main\java\q\Main.java exists, compiles and is a public class in the same package.

build.gradle:

plugins {
    id 'java'
}

repositories {
    jcenter()
}

dependencies {
    implementation 'com.google.guava:guava:29.0-jre'

    testImplementation 'junit:junit:4.13'
}

I have been working around this by adding the following to build.gradle:

sourceSets {
       test {
               java.srcDirs = ['src/main/', 'src/test/']
       }
}

And that works, but it causes errors in IntelliJ.

来源：https://stackoverflow.com/questions/61707087/error-cannot-find-symbol-in-gradle-compiletestjava