diff --git a/java/java-impl/src/com/intellij/psi/impl/search/JavaIndexPatternBuilder.java b/java/java-impl/src/com/intellij/psi/impl/search/JavaIndexPatternBuilder.java
index 18e35d262965..e8bf265a3bf3 100644
--- a/java/java-impl/src/com/intellij/psi/impl/search/JavaIndexPatternBuilder.java
+++ b/java/java-impl/src/com/intellij/psi/impl/search/JavaIndexPatternBuilder.java
@@ -51,7 +51,7 @@ public class JavaIndexPatternBuilder implements IndexPatternBuilder {
 
   @NotNull
   @Override
-  public String getCharsAllowedInContinuationPrefix(IElementType tokenType) {
+  public String getCharsAllowedInContinuationPrefix(@NotNull IElementType tokenType) {
     return tokenType == JavaTokenType.C_STYLE_COMMENT || tokenType == JavaDocElementType.DOC_COMMENT ? "*" : "";
   }
 }
diff --git a/platform/editor-ui-ex/src/com/intellij/psi/impl/search/IndexPatternOccurrenceImpl.java b/platform/editor-ui-ex/src/com/intellij/psi/impl/search/IndexPatternOccurrenceImpl.java
index b14741a7ecd8..5c19a8e3a362 100644
--- a/platform/editor-ui-ex/src/com/intellij/psi/impl/search/IndexPatternOccurrenceImpl.java
+++ b/platform/editor-ui-ex/src/com/intellij/psi/impl/search/IndexPatternOccurrenceImpl.java
@@ -20,7 +20,8 @@ class IndexPatternOccurrenceImpl implements IndexPatternOccurrence {
   private final IndexPattern myPattern;
   private final List<TextRange> myAdditionalRanges;
 
-  public IndexPatternOccurrenceImpl(PsiFile file, int startOffset, int endOffset, IndexPattern pattern, List<TextRange> additionalRanges) {
+  public IndexPatternOccurrenceImpl(@NotNull PsiFile file, int startOffset, int endOffset,
+                                    @NotNull IndexPattern pattern, @NotNull List<TextRange> additionalRanges) {
     myFile = file;
     myStartOffset = startOffset;
     myEndOffset = endOffset;
diff --git a/platform/indexing-impl/src/com/intellij/psi/impl/search/IndexPatternBuilder.java b/platform/indexing-impl/src/com/intellij/psi/impl/search/IndexPatternBuilder.java
index bac71d63156c..d52367c82c6b 100644
--- a/platform/indexing-impl/src/com/intellij/psi/impl/search/IndexPatternBuilder.java
+++ b/platform/indexing-impl/src/com/intellij/psi/impl/search/IndexPatternBuilder.java
@@ -30,7 +30,7 @@ public interface IndexPatternBuilder {
    * on subsequent line
    */
   @NotNull
-  default String getCharsAllowedInContinuationPrefix(IElementType tokenType) {
+  default String getCharsAllowedInContinuationPrefix(@NotNull IElementType tokenType) {
     return "";
   }
 }