diff --git a/java/compiler/tests/com/intellij/compiler/UnloadedModulesCompilationTest.java b/java/compiler/tests/com/intellij/compiler/UnloadedModulesCompilationTest.kt
similarity index 100%
rename from java/compiler/tests/com/intellij/compiler/UnloadedModulesCompilationTest.java
rename to java/compiler/tests/com/intellij/compiler/UnloadedModulesCompilationTest.kt
diff --git a/java/java-tests/testSrc/com/intellij/openapi/roots/impl/DirectoryIndexForUnloadedModuleTest.java b/java/java-tests/testSrc/com/intellij/openapi/roots/impl/DirectoryIndexForUnloadedModuleTest.kt
similarity index 100%
rename from java/java-tests/testSrc/com/intellij/openapi/roots/impl/DirectoryIndexForUnloadedModuleTest.java
rename to java/java-tests/testSrc/com/intellij/openapi/roots/impl/DirectoryIndexForUnloadedModuleTest.kt
diff --git a/platform/platform-impl/src/com/intellij/ide/lightEdit/project/LightEditProjectManager.java b/platform/platform-impl/src/com/intellij/ide/lightEdit/project/LightEditProjectManager.kt
similarity index 100%
rename from platform/platform-impl/src/com/intellij/ide/lightEdit/project/LightEditProjectManager.java
rename to platform/platform-impl/src/com/intellij/ide/lightEdit/project/LightEditProjectManager.kt
diff --git a/platform/projectModel-api/src/com/intellij/openapi/module/ModuleManager.java b/platform/projectModel-api/src/com/intellij/openapi/module/ModuleManager.kt
similarity index 100%
rename from platform/projectModel-api/src/com/intellij/openapi/module/ModuleManager.java
rename to platform/projectModel-api/src/com/intellij/openapi/module/ModuleManager.kt