diff --git a/java/java-impl/src/com/intellij/codeInsight/completion/JavaClassNameCompletionContributor.java b/java/java-impl/src/com/intellij/codeInsight/completion/JavaClassNameCompletionContributor.java
index ed2b05deba3c..03eafb4c2d7a 100644
--- a/java/java-impl/src/com/intellij/codeInsight/completion/JavaClassNameCompletionContributor.java
+++ b/java/java-impl/src/com/intellij/codeInsight/completion/JavaClassNameCompletionContributor.java
@@ -275,7 +275,7 @@ public class JavaClassNameCompletionContributor extends CompletionContributor im
 
 
   @Override
-  public @NlsContexts.HintText String handleEmptyLookup(final @NotNull CompletionParameters parameters, final Editor editor) {
+  public @NlsContexts.HintText String handleEmptyLookup(final @NotNull CompletionParameters parameters, final @NotNull Editor editor) {
     if (!(parameters.getOriginalFile() instanceof PsiJavaFile)) return null;
 
     if (shouldShowSecondSmartCompletionHint(parameters)) {
diff --git a/java/java-impl/src/com/intellij/codeInsight/completion/JavaCompletionContributor.java b/java/java-impl/src/com/intellij/codeInsight/completion/JavaCompletionContributor.java
index 2bd8d608603d..149ead90832b 100644
--- a/java/java-impl/src/com/intellij/codeInsight/completion/JavaCompletionContributor.java
+++ b/java/java-impl/src/com/intellij/codeInsight/completion/JavaCompletionContributor.java
@@ -1212,7 +1212,7 @@ public final class JavaCompletionContributor extends CompletionContributor imple
   }
 
   @Override
-  public @NlsContexts.HintText String handleEmptyLookup(@NotNull CompletionParameters parameters, Editor editor) {
+  public @NlsContexts.HintText String handleEmptyLookup(@NotNull CompletionParameters parameters, @NotNull Editor editor) {
     if (!(parameters.getOriginalFile() instanceof PsiJavaFile)) return null;
 
     String ad = advertise(parameters);
diff --git a/platform/analysis-api/src/com/intellij/codeInsight/completion/CompletionContributor.java b/platform/analysis-api/src/com/intellij/codeInsight/completion/CompletionContributor.java
index 80343ceac1f9..79cf849cfa91 100644
--- a/platform/analysis-api/src/com/intellij/codeInsight/completion/CompletionContributor.java
+++ b/platform/analysis-api/src/com/intellij/codeInsight/completion/CompletionContributor.java
@@ -193,7 +193,7 @@ public abstract class CompletionContributor implements PossiblyDumbAware {
    *
    * @return hint text to be shown if no variants are found, typically "No suggestions"
    */
-  public @Nullable @NlsContexts.HintText String handleEmptyLookup(@NotNull CompletionParameters parameters, final Editor editor) {
+  public @Nullable @NlsContexts.HintText String handleEmptyLookup(@NotNull CompletionParameters parameters, @NotNull Editor editor) {
     return null;
   }