diff --git a/platform/lang-impl/src/com/intellij/openapi/projectRoots/impl/SdkUsagesCollector.java b/platform/lang-impl/src/com/intellij/openapi/projectRoots/impl/SdkUsagesCollector.java
index 4f423879d7a8..2c0bcbad1d4a 100644
--- a/platform/lang-impl/src/com/intellij/openapi/projectRoots/impl/SdkUsagesCollector.java
+++ b/platform/lang-impl/src/com/intellij/openapi/projectRoots/impl/SdkUsagesCollector.java
@@ -64,8 +64,7 @@ public class SdkUsagesCollector {
     return usages;
   }
 
-  @SuppressWarnings("unused")
-  private static class ProjectSdkUsages implements SdkUsagesContributor {
+  public static class ProjectSdkUsages implements SdkUsagesContributor {
     @NotNull
     @Override
     public List<SdkUsage> contributeUsages(@NotNull Project project) {
@@ -80,8 +79,7 @@ public class SdkUsagesCollector {
     }
   }
 
-  @SuppressWarnings("unused")
-  private static class ModuleSdkUsages implements SdkUsagesContributor {
+  public static class ModuleSdkUsages implements SdkUsagesContributor {
     @NotNull
     @Override
     public List<SdkUsage> contributeUsages(@NotNull Project project) {
diff --git a/platform/lang-impl/src/com/intellij/openapi/projectRoots/impl/UnknownSdkTracker.java b/platform/lang-impl/src/com/intellij/openapi/projectRoots/impl/UnknownSdkTracker.java
index 6e59dee10878..568d7da8f18b 100644
--- a/platform/lang-impl/src/com/intellij/openapi/projectRoots/impl/UnknownSdkTracker.java
+++ b/platform/lang-impl/src/com/intellij/openapi/projectRoots/impl/UnknownSdkTracker.java
@@ -41,8 +41,7 @@ import static com.intellij.openapi.projectRoots.impl.UnknownSdkResolver.UnknownS
 public class UnknownSdkTracker {
   private static final Logger LOG = Logger.getInstance(UnknownSdkTracker.class);
 
-  //TODO: subscribe for a project reload!
-  private static class ActivityTracker implements StartupActivity.Background, StartupActivity.DumbAware {
+  public static class ActivityTracker implements StartupActivity.Background, StartupActivity.DumbAware {
     @Override
     public void runActivity(@NotNull Project project) {
       StartupManager.getInstance(project).runWhenProjectIsInitialized(() -> updateUnknownSdks(project));