diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/BaseGradleIT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/BaseGradleIT.kt
index 28b03b25a4a..d2801e1d2b5 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/BaseGradleIT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/BaseGradleIT.kt
@@ -375,7 +375,7 @@ abstract class BaseGradleIT {
 
     fun CompiledProject.assertTasksExecuted(tasks: Iterable<String>) {
         for (task in tasks) {
-            assertContains("Executing task '$task'")
+            assertContainsRegex("(Executing actions for task|Executing task) '$task'".toRegex())
         }
     }
 
@@ -440,6 +440,26 @@ abstract class BaseGradleIT {
             else
                 assertSameFiles(sources, compiledJavaSources.projectRelativePaths(this.project), "Compiled Java files differ:\n  ")
 
+    fun Project.resourcesDir(subproject: String? = null, sourceSet: String = "main") =
+            (subproject?.plus("/") ?: "") + "build/" +
+            (if (GradleVersion.version(chooseWrapperVersionOrFinishTest()) < GradleVersion.version("4.0"))
+                "classes/"
+            else "resources/") +
+            sourceSet + "/"
+
+    fun Project.classesDir(subproject: String? = null, sourceSet: String = "main", language: String = "kotlin") =
+            (subproject?.plus("/") ?: "") + "build/classes/" +
+            (if (GradleVersion.version(chooseWrapperVersionOrFinishTest()) >= GradleVersion.version("4.0"))
+                "$language/"
+            else "") +
+            sourceSet + "/"
+
+    fun CompiledProject.kotlinClassesDir(subproject: String? = null, sourceSet: String = "main") =
+            project.classesDir(subproject, sourceSet, language = "kotlin")
+
+    fun CompiledProject.javaClassesDir(subproject: String? = null, sourceSet: String = "main") =
+            project.classesDir(subproject, sourceSet, language = "java")
+
     private fun Project.createBuildCommand(wrapperDir: File, params: Array<out String>, options: BuildOptions): List<String> =
             createGradleCommand(wrapperDir, createGradleTailParameters(options, params))
 
@@ -476,6 +496,10 @@ abstract class BaseGradleIT {
                 if (options.withBuildCache) {
                     add("--build-cache")
                 }
+
+                // Workaround: override a console type set in the user machine gradle.properties (since Gradle 4.3):
+                add("--console=plain")
+
                 addAll(options.freeCommandLineArgs)
             }
 
diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/ExecutionStrategyIT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/ExecutionStrategyIT.kt
index b88f705e7a5..d5f5e678fd8 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/ExecutionStrategyIT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/ExecutionStrategyIT.kt
@@ -69,6 +69,6 @@ open class ExecutionStrategyIT : BaseGradleIT() {
     }
 
     protected open fun CompiledProject.checkOutput() {
-        assertFileExists("app/build/classes/kotlin/main/foo/MainKt.class")
+        assertFileExists(kotlinClassesDir(subproject = "app") + "foo/MainKt.class")
     }
 }
\ No newline at end of file
diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kapt3IT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kapt3IT.kt
index f5ab608da42..20ede01437d 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kapt3IT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kapt3IT.kt
@@ -49,8 +49,9 @@ open class Kapt3IT : Kapt3BaseIT() {
             assertContains(":compileKotlin")
             assertContains(":compileJava")
             assertFileExists("build/generated/source/kapt/main/example/TestClassGenerated.java")
-            assertFileExists("build/classes/main/example/TestClass.class")
-            assertFileExists("build/classes/main/example/TestClassGenerated.class")
+            val javaClassesDir = javaClassesDir()
+            assertFileExists(javaClassesDir + "example/TestClass.class")
+            assertFileExists(javaClassesDir + "example/TestClassGenerated.class")
         }
     }
 
@@ -64,11 +65,12 @@ open class Kapt3IT : Kapt3BaseIT() {
             assertContains(":compileKotlin")
             assertContains(":compileJava")
             assertFileExists("build/generated/source/kapt/main/example/TestClassGenerated.java")
-            assertFileExists("build/classes/main/example/TestClass.class")
-            assertFileExists("build/classes/main/example/TestClassGenerated.class")
-            assertFileExists("build/classes/main/example/SourceAnnotatedTestClassGenerated.class")
-            assertFileExists("build/classes/main/example/BinaryAnnotatedTestClassGenerated.class")
-            assertFileExists("build/classes/main/example/RuntimeAnnotatedTestClassGenerated.class")
+            assertFileExists(kotlinClassesDir() + "example/TestClass.class")
+            val javaClassesDir = javaClassesDir()
+            assertFileExists(javaClassesDir + "example/TestClassGenerated.class")
+            assertFileExists(javaClassesDir + "example/SourceAnnotatedTestClassGenerated.class")
+            assertFileExists(javaClassesDir + "example/BinaryAnnotatedTestClassGenerated.class")
+            assertFileExists(javaClassesDir + "example/RuntimeAnnotatedTestClassGenerated.class")
             assertContains("example.JavaTest PASSED")
             assertClassFilesNotContain(File(project.projectDir, "build/classes"), "ExampleSourceAnnotation")
             assertNotContains("warning: The following options were not recognized by any processor")
@@ -85,14 +87,14 @@ open class Kapt3IT : Kapt3BaseIT() {
     fun testSimpleWithIC() {
         val options = defaultBuildOptions().copy(incremental = true)
         val project = Project("simple", GRADLE_VERSION, directoryPrefix = "kapt2")
-        val classesDir = File(project.projectDir, "build/classes")
+        val javaClassesDir = File(project.projectDir, project.classesDir(language = "java"))
 
         project.build("clean", "build", options = options) {
             assertSuccessful()
             assertKaptSuccessful()
             assertContains(":compileKotlin")
             assertContains(":compileJava")
-            assertClassFilesNotContain(classesDir, "ExampleSourceAnnotation")
+            assertClassFilesNotContain(javaClassesDir, "ExampleSourceAnnotation")
         }
 
         project.projectDir.getFilesByNames("InternalDummy.kt", "test.kt").forEach { it.appendText(" ") }
@@ -101,18 +103,18 @@ open class Kapt3IT : Kapt3BaseIT() {
             assertKaptSuccessful()
             assertContains(":compileKotlin")
             assertContains(":compileJava")
-            assertClassFilesNotContain(classesDir, "ExampleSourceAnnotation")
+            assertClassFilesNotContain(javaClassesDir, "ExampleSourceAnnotation")
         }
 
         // emulating wipe by android plugin's IncrementalSafeguardTask
-        classesDir.deleteRecursively()
+        javaClassesDir.deleteRecursively()
         project.build("build", options = options) {
             assertSuccessful()
             assertContains(":compileKotlin UP-TO-DATE")
             assertContains(":kaptGenerateStubsKotlin UP-TO-DATE")
             assertContains(":kaptKotlin UP-TO-DATE")
-            assertFileExists("build/classes/main/example/TestClass.class")
-            assertClassFilesNotContain(classesDir, "ExampleSourceAnnotation")
+            assertFileExists(kotlinClassesDir() + "example/TestClass.class")
+            assertClassFilesNotContain(javaClassesDir, "ExampleSourceAnnotation")
         }
     }
 
@@ -136,8 +138,8 @@ open class Kapt3IT : Kapt3BaseIT() {
                     "endsWithEquals=a:, withSpace=a b c,")
             assertContains("-Xmaxerrs=500, -Xlint:all=-Xlint:all") // Javac options test
             assertFileExists("build/generated/source/kapt/main/example/TestClassCustomized.java")
-            assertFileExists("build/classes/main/example/TestClass.class")
-            assertFileExists("build/classes/main/example/TestClassCustomized.class")
+            assertFileExists(kotlinClassesDir() + "example/TestClass.class")
+            assertFileExists(javaClassesDir() + "example/TestClassCustomized.class")
         }
     }
 
@@ -148,8 +150,8 @@ open class Kapt3IT : Kapt3BaseIT() {
             assertKaptSuccessful()
             assertFileExists("build/generated/source/kapt/main/example/TestClassGenerated.java")
             assertFileExists("build/generated/source/kapt/main/example/AncestorClassGenerated.java")
-            assertFileExists("build/classes/main/example/TestClassGenerated.class")
-            assertFileExists("build/classes/main/example/AncestorClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/TestClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/AncestorClassGenerated.class")
         }
     }
 
@@ -162,17 +164,17 @@ open class Kapt3IT : Kapt3BaseIT() {
             assertKaptSuccessful()
             assertContains(":compileKotlin")
             assertContains(":compileJava")
-            assertFileExists("build/classes/main/example/TestClass.class")
+            assertFileExists(kotlinClassesDir() + "example/TestClass.class")
 
             assertFileExists("build/generated/source/kapt/main/example/TestClassGenerated.java")
             assertFileExists("build/generated/source/kapt/main/example/SourceAnnotatedTestClassGenerated.java")
             assertFileExists("build/generated/source/kapt/main/example/BinaryAnnotatedTestClassGenerated.java")
             assertFileExists("build/generated/source/kapt/main/example/RuntimeAnnotatedTestClassGenerated.java")
 
-            assertFileExists("build/classes/main/example/TestClassGenerated.class")
-            assertFileExists("build/classes/main/example/SourceAnnotatedTestClassGenerated.class")
-            assertFileExists("build/classes/main/example/BinaryAnnotatedTestClassGenerated.class")
-            assertFileExists("build/classes/main/example/RuntimeAnnotatedTestClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/TestClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/SourceAnnotatedTestClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/BinaryAnnotatedTestClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/RuntimeAnnotatedTestClassGenerated.class")
         }
 
         val testKt = project.projectDir.getFileByName("test.kt")
@@ -182,17 +184,17 @@ open class Kapt3IT : Kapt3BaseIT() {
             assertSuccessful()
             assertContains(":compileKotlin")
             assertContains(":compileJava")
-            assertFileExists("build/classes/main/example/TestClass.class")
+            assertFileExists(kotlinClassesDir() + "example/TestClass.class")
 
             assertFileExists("build/generated/source/kapt/main/example/TestClassGenerated.java")
             assertFileExists("build/generated/source/kapt/main/example/SourceAnnotatedTestClassGenerated.java")
             /*!*/   assertNoSuchFile("build/generated/source/kapt/main/example/BinaryAnnotatedTestClassGenerated.java")
             assertFileExists("build/generated/source/kapt/main/example/RuntimeAnnotatedTestClassGenerated.java")
 
-            assertFileExists("build/classes/main/example/TestClassGenerated.class")
-            assertFileExists("build/classes/main/example/SourceAnnotatedTestClassGenerated.class")
-            /*!*/   assertNoSuchFile("build/classes/main/example/BinaryAnnotatedTestClassGenerated.class")
-            assertFileExists("build/classes/main/example/RuntimeAnnotatedTestClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/TestClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/SourceAnnotatedTestClassGenerated.class")
+            /*!*/   assertNoSuchFile(javaClassesDir() + "example/BinaryAnnotatedTestClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/RuntimeAnnotatedTestClassGenerated.class")
         }
     }
 
@@ -296,8 +298,8 @@ open class Kapt3IT : Kapt3BaseIT() {
             assertKaptSuccessful()
             assertFileExists("build/generated/source/kapt/main/example/TestClassCustomized.java")
             assertFileExists("build/generated/source/kaptKotlin/main/TestClass.kt")
-            assertFileExists("build/classes/main/example/TestClass.class")
-            assertFileExists("build/classes/main/example/TestClassCustomized.class")
+            assertFileExists(kotlinClassesDir() + "example/TestClass.class")
+            assertFileExists(javaClassesDir() + "example/TestClassCustomized.class")
         }
     }
 
diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KaptIT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KaptIT.kt
index 103907771bc..d92f78fcab6 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KaptIT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KaptIT.kt
@@ -24,14 +24,15 @@ class KaptIT: BaseGradleIT() {
             assertContains(":compileJava")
             assertFileExists("build/tmp/kapt/main/wrappers/annotations.main.txt")
             assertFileExists("build/generated/source/kapt/main/example/TestClassGenerated.java")
-            assertFileExists("build/classes/main/example/TestClass.class")
-            assertFileExists("build/classes/main/example/TestClassGenerated.class")
-            assertNoSuchFile("build/classes/main/example/SourceAnnotatedTestClassGenerated.class")
-            assertFileExists("build/classes/main/example/BinaryAnnotatedTestClassGenerated.class")
-            assertFileExists("build/classes/main/example/RuntimeAnnotatedTestClassGenerated.class")
+            assertFileExists(kotlinClassesDir() + "example/TestClass.class")
+            assertFileExists(javaClassesDir() + "example/TestClassGenerated.class")
+            assertNoSuchFile(javaClassesDir() + "example/SourceAnnotatedTestClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/BinaryAnnotatedTestClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/RuntimeAnnotatedTestClassGenerated.class")
             assertContains("example.JavaTest PASSED")
             assertContains("example.KotlinTest PASSED")
-            assertClassFilesNotContain(File(project.projectDir, "build/classes"), "ExampleSourceAnnotation")
+            assertClassFilesNotContain(File(project.projectDir, kotlinClassesDir()), "ExampleSourceAnnotation")
+            assertClassFilesNotContain(File(project.projectDir, javaClassesDir()), "ExampleSourceAnnotation")
         }
 
         // clean build is important
@@ -70,11 +71,11 @@ class KaptIT: BaseGradleIT() {
             assertContains(":compileJava")
             assertFileExists("build/tmp/kapt/main/wrappers/annotations.main.txt")
             assertFileExists("build/generated/source/kapt/main/example/TestClassGenerated.java")
-            assertFileExists("build/classes/main/example/TestClass.class")
-            assertFileExists("build/classes/main/example/TestClassGenerated.class")
-            assertFileExists("build/classes/main/example/SourceAnnotatedTestClassGenerated.class")
-            assertFileExists("build/classes/main/example/BinaryAnnotatedTestClassGenerated.class")
-            assertFileExists("build/classes/main/example/RuntimeAnnotatedTestClassGenerated.class")
+            assertFileExists(kotlinClassesDir() + "example/TestClass.class")
+            assertFileExists(javaClassesDir() + "example/TestClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/SourceAnnotatedTestClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/BinaryAnnotatedTestClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/RuntimeAnnotatedTestClassGenerated.class")
             assertNotContains("w: Classpath entry points to a non-existent location")
             assertContains("example.JavaTest PASSED")
         }
@@ -95,8 +96,8 @@ class KaptIT: BaseGradleIT() {
             assertContains("kapt: Using class file stubs")
             assertContains(":compileKotlin")
             assertContains(":compileJava")
-            assertFileExists("build/classes/main/example/TestClass.class")
-            assertFileExists("build/classes/main/example/TestClassGenerated.class")
+            assertFileExists(kotlinClassesDir() + "example/TestClass.class")
+            assertFileExists(javaClassesDir() + "example/TestClassGenerated.class")
         }
     }
 
@@ -159,8 +160,8 @@ class KaptIT: BaseGradleIT() {
             assertContains(":compileJava")
             assertFileExists("build/tmp/kapt/main/wrappers/annotations.main.txt")
             assertFileExists("build/generated/source/kapt/main/example/TestClassCustomized.java")
-            assertFileExists("build/classes/main/example/TestClass.class")
-            assertFileExists("build/classes/main/example/TestClassCustomized.class")
+            assertFileExists(kotlinClassesDir() + "example/TestClass.class")
+            assertFileExists(javaClassesDir() + "example/TestClassCustomized.class")
         }
     }
 
@@ -173,8 +174,8 @@ class KaptIT: BaseGradleIT() {
             assertSuccessful()
             assertFileExists("build/generated/source/kapt/main/example/TestClassGenerated.java")
             assertFileExists("build/generated/source/kapt/main/example/AncestorClassGenerated.java")
-            assertFileExists("build/classes/main/example/TestClassGenerated.class")
-            assertFileExists("build/classes/main/example/AncestorClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/TestClassGenerated.class")
+            assertFileExists(javaClassesDir() + "example/AncestorClassGenerated.class")
         }
     }
 
@@ -191,8 +192,8 @@ class KaptIT: BaseGradleIT() {
             assertFileExists("build/tmp/kapt/main/wrappers/annotations.main.txt")
             assertFileExists("build/generated/source/kapt/main/example/TestClassCustomized.java")
             assertFileExists("build/tmp/kapt/main/kotlinGenerated/TestClass.kt")
-            assertFileExists("build/classes/main/example/TestClass.class")
-            assertFileExists("build/classes/main/example/TestClassCustomized.class")
+            assertFileExists(kotlinClassesDir() + "example/TestClass.class")
+            assertFileExists(javaClassesDir() + "example/TestClassCustomized.class")
         }
     }
 
diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt
index c422c48c0c4..c09e14269ef 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt
@@ -103,8 +103,8 @@ class Kotlin2JsGradlePluginIT : BaseGradleIT() {
 
         project.build("build") {
             assertSuccessful()
-            assertFileExists("build/classes/main/kotlin2JsNoOutputFileProject.js")
-            assertFileExists("build/classes/test/kotlin2JsNoOutputFileProject_test.js")
+            assertFileExists(kotlinClassesDir() + "kotlin2JsNoOutputFileProject.js")
+            assertFileExists(kotlinClassesDir(sourceSet = "test") + "kotlin2JsNoOutputFileProject_test.js")
         }
     }
 
diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinGradlePluginIT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinGradlePluginIT.kt
index 29b40fef25e..c817ebc3e70 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinGradlePluginIT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinGradlePluginIT.kt
@@ -75,7 +75,7 @@ class KotlinGradleIT: BaseGradleIT() {
 
         project.build("build") {
             assertSuccessful()
-            assertFileExists("build/classes/main/META-INF/kotlinProject.kotlin_module")
+            assertFileExists(kotlinClassesDir() + "META-INF/kotlinProject.kotlin_module")
             assertReportExists()
             assertContains(":compileKotlin", ":compileTestKotlin")
             assertNotContains("Forcing System.gc")
@@ -395,7 +395,7 @@ class KotlinGradleIT: BaseGradleIT() {
 
         project.build("build") {
             assertSuccessful()
-            assertFileExists("build/classes/main/META-INF/$customModuleName.kotlin_module")
+            assertFileExists(kotlinClassesDir() + "META-INF/$customModuleName.kotlin_module")
         }
     }
 
@@ -557,8 +557,8 @@ class KotlinGradleIT: BaseGradleIT() {
             assertSuccessful()
 
             // Check that the Kotlin classes are placed under directories following the guideline:
-            assertFileExists("build/classes/kotlin/main/demo/KotlinGreetingJoiner.class")
-            assertFileExists("build/classes/kotlin/deploy/demo/ExampleSource.class")
+            assertFileExists(kotlinClassesDir() + "demo/KotlinGreetingJoiner.class")
+            assertFileExists(kotlinClassesDir(sourceSet = "deploy") + "demo/ExampleSource.class")
 
             // Check that the resulting JAR contains the Kotlin classes, without duplicates:
             val jar = ZipFile(fileInWorkingDir("build/libs/${project.projectName}.jar"))
@@ -592,8 +592,8 @@ class KotlinGradleIT: BaseGradleIT() {
         project.build("build", "compileDeployKotlin") {
             assertSuccessful()
             // Main source set should have a *.kotlin_module file without '_main'
-            assertFileExists("build/classes/kotlin/main/META-INF/$archivesBaseName.kotlin_module")
-            assertFileExists("build/classes/kotlin/deploy/META-INF/${archivesBaseName}_deploy.kotlin_module")
+            assertFileExists(kotlinClassesDir() + "META-INF/$archivesBaseName.kotlin_module")
+            assertFileExists(kotlinClassesDir(sourceSet = "deploy") + "META-INF/${archivesBaseName}_deploy.kotlin_module")
         }
     }
 
@@ -612,12 +612,14 @@ class KotlinGradleIT: BaseGradleIT() {
 
     @Test
     fun testDisableSeparateClassesDirs() {
-        val separateDirPath = "build/classes/kotlin/main/demo/KotlinGreetingJoiner.class"
-        val singleDirPath = "build/classes/java/main/demo/KotlinGreetingJoiner.class"
 
         fun CompiledProject.check(copyClassesToJavaOutput: Boolean?,
                                   expectBuildCacheWarning: Boolean,
                                   expectGradleLowVersionWarning: Boolean) {
+
+            val separateDirPath = kotlinClassesDir() + "demo/KotlinGreetingJoiner.class"
+            val singleDirPath = javaClassesDir() + "demo/KotlinGreetingJoiner.class"
+
             assertSuccessful()
             when (copyClassesToJavaOutput) {
                 true -> {
diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/SimpleKotlinGradleIT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/SimpleKotlinGradleIT.kt
index 51d99856126..18ad42b055a 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/SimpleKotlinGradleIT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/SimpleKotlinGradleIT.kt
@@ -110,7 +110,7 @@ class SimpleKotlinGradleIT : BaseGradleIT() {
         Project("allOpenSimple", GRADLE_VERSION).build("build") {
             assertSuccessful()
 
-            val classesDir = File(project.projectDir, "build/classes/main")
+            val classesDir = File(project.projectDir, kotlinClassesDir())
             val openClass = File(classesDir, "test/OpenClass.class")
             val closedClass = File(classesDir, "test/ClosedClass.class")
             assertTrue(openClass.exists())
@@ -152,7 +152,7 @@ class SimpleKotlinGradleIT : BaseGradleIT() {
         Project("noArgJpa", GRADLE_VERSION).build("build") {
             assertSuccessful()
 
-            val classesDir = File(project.projectDir, "build/classes/main")
+            val classesDir = File(project.projectDir, kotlinClassesDir())
 
             fun checkClass(name: String) {
                 val testClass = File(classesDir, "test/$name.class")
diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/UpToDatenessIT.kt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/UpToDatenessIT.kt
index 7d2545c4c5a..79424432c71 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/UpToDatenessIT.kt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/UpToDatenessIT.kt
@@ -119,7 +119,7 @@ class UpToDateIT : BaseGradleIT() {
         lateinit var helloWorldKtClass: File
 
         override fun mutateProject(project: Project) = with(project) {
-            helloWorldKtClass = File(projectDir, "build/classes/kotlin/main/demo/KotlinGreetingJoiner.class")
+            helloWorldKtClass = File(projectDir, project.classesDir() + "demo/KotlinGreetingJoiner.class")
             Assume.assumeTrue(helloWorldKtClass.exists())
             helloWorldKtClass.delete(); Unit
         }