NotNull

java/java-impl/src/com/intellij/psi/impl/java/stubs/index/JavaAnnotationIndex.java

@@ -36,6 +36,7 @@ public class JavaAnnotationIndex extends StringStubIndexExtension<PsiAnnotation>
     return ourInstance;
   }
 
+  @NotNull
   @Override
   public StubIndexKey<String, PsiAnnotation> getKey() {
     return JavaStubIndexKeys.ANNOTATIONS;

java/java-impl/src/com/intellij/psi/impl/java/stubs/index/JavaAnonymousClassBaseRefOccurenceIndex.java

@@ -37,6 +37,7 @@ public class JavaAnonymousClassBaseRefOccurenceIndex extends StringStubIndexExte
   }
 
 
+  @NotNull
   @Override
   public StubIndexKey<String, PsiAnonymousClass> getKey() {
     return JavaStubIndexKeys.ANONYMOUS_BASEREF;

java/java-impl/src/com/intellij/psi/impl/java/stubs/index/JavaFieldNameIndex.java

@@ -36,6 +36,7 @@ public class JavaFieldNameIndex extends StringStubIndexExtension<PsiField> {
     return ourInstance;
   }
 
+  @NotNull
   @Override
   public StubIndexKey<String, PsiField> getKey() {
     return JavaStubIndexKeys.FIELDS;

java/java-impl/src/com/intellij/psi/impl/java/stubs/index/JavaFullClassNameIndex.java

@@ -36,6 +36,7 @@ public class JavaFullClassNameIndex extends IntStubIndexExtension<PsiClass> {
     return ourInstance;
   }
 
+  @NotNull
   @Override
   public StubIndexKey<Integer, PsiClass> getKey() {
     return JavaStubIndexKeys.CLASS_FQN;

java/java-impl/src/com/intellij/psi/impl/java/stubs/index/JavaMethodNameIndex.java

@@ -36,6 +36,7 @@ public class JavaMethodNameIndex extends StringStubIndexExtension<PsiMethod> {
     return ourInstance;
   }
 
+  @NotNull
   @Override
   public StubIndexKey<String, PsiMethod> getKey() {
     return JavaStubIndexKeys.METHODS;

java/java-impl/src/com/intellij/psi/impl/java/stubs/index/JavaShortClassNameIndex.java

@@ -36,6 +36,7 @@ public class JavaShortClassNameIndex extends StringStubIndexExtension<PsiClass>
     return ourInstance;
   }
 
+  @NotNull
   @Override
   public StubIndexKey<String, PsiClass> getKey() {
     return JavaStubIndexKeys.CLASS_SHORT_NAMES;

java/java-impl/src/com/intellij/psi/impl/java/stubs/index/JavaSuperClassNameOccurenceIndex.java

@@ -37,6 +37,7 @@ public class JavaSuperClassNameOccurenceIndex extends StringStubIndexExtension<P
     return ourInstance;
   }
 
+  @NotNull
   @Override
   public StubIndexKey<String, PsiReferenceList> getKey() {
     return JavaStubIndexKeys.SUPER_CLASSES;