diff --git a/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/base/MutablyNamedIntention.java b/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/base/MutablyNamedIntention.java
index b740d1f8bc87..6e020224e712 100644
--- a/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/base/MutablyNamedIntention.java
+++ b/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/base/MutablyNamedIntention.java
@@ -9,9 +9,10 @@ import com.intellij.psi.PsiFile;
 import org.jetbrains.annotations.NotNull;
 
 public abstract class MutablyNamedIntention extends Intention {
-  private @IntentionName String text = null;
+  private @IntentionName String text;
 
-  protected abstract @IntentionName String getTextForElement(PsiElement element);
+  @NotNull
+  protected abstract @IntentionName String getTextForElement(@NotNull PsiElement element);
 
   @Override
   @NotNull
diff --git a/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/DemorgansLawIntention.java b/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/DemorgansLawIntention.java
index 1f2559851290..7b1df16ac649 100644
--- a/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/DemorgansLawIntention.java
+++ b/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/DemorgansLawIntention.java
@@ -21,7 +21,7 @@ import org.jetbrains.plugins.groovy.lang.psi.impl.utils.ParenthesesUtils;
 public class DemorgansLawIntention extends MutablyNamedIntention {
 
   @Override
-  protected @IntentionName String getTextForElement(PsiElement element) {
+  protected @IntentionName @NotNull String getTextForElement(@NotNull PsiElement element) {
     final GrBinaryExpression binaryExpression = (GrBinaryExpression)element;
     final IElementType tokenType = binaryExpression.getOperationTokenType();
     if (GroovyTokenTypes.mLAND.equals(tokenType)) {
diff --git a/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/FlipComparisonIntention.java b/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/FlipComparisonIntention.java
index d07cd79de604..f0d4676ba562 100644
--- a/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/FlipComparisonIntention.java
+++ b/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/FlipComparisonIntention.java
@@ -18,7 +18,7 @@ import org.jetbrains.plugins.groovy.lang.psi.impl.utils.ComparisonUtils;
 
 public class FlipComparisonIntention extends MutablyNamedIntention {
   @Override
-  protected @IntentionName String getTextForElement(PsiElement element) {
+  protected @IntentionName @NotNull String getTextForElement(@NotNull PsiElement element) {
     final GrBinaryExpression binaryExpression = (GrBinaryExpression) element;
     final IElementType tokenType = binaryExpression.getOperationTokenType();
     final String comparison = ComparisonUtils.getStringForComparison(tokenType);
diff --git a/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/FlipConjunctionIntention.java b/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/FlipConjunctionIntention.java
index 1ce757569b22..73f835de9e94 100644
--- a/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/FlipConjunctionIntention.java
+++ b/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/FlipConjunctionIntention.java
@@ -18,7 +18,7 @@ import org.jetbrains.plugins.groovy.lang.psi.impl.PsiImplUtil;
 
 public class FlipConjunctionIntention extends MutablyNamedIntention {
   @Override
-  protected @IntentionName String getTextForElement(PsiElement element) {
+  protected @IntentionName @NotNull String getTextForElement(@NotNull PsiElement element) {
     final GrBinaryExpression binaryExpression = (GrBinaryExpression)element;
     final IElementType tokenType = binaryExpression.getOperationTokenType();
     final String conjunction = getConjunction(tokenType);
diff --git a/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/NegateComparisonIntention.java b/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/NegateComparisonIntention.java
index dde3fd4b3f19..c346208d2f2d 100644
--- a/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/NegateComparisonIntention.java
+++ b/plugins/groovy/src/org/jetbrains/plugins/groovy/intentions/control/NegateComparisonIntention.java
@@ -17,7 +17,7 @@ import org.jetbrains.plugins.groovy.lang.psi.impl.utils.ComparisonUtils;
 
 public class NegateComparisonIntention extends MutablyNamedIntention {
   @Override
-  protected @IntentionName String getTextForElement(PsiElement element) {
+  protected @IntentionName @NotNull String getTextForElement(@NotNull PsiElement element) {
     final GrBinaryExpression binaryExpression = (GrBinaryExpression) element;
     final IElementType tokenType = binaryExpression.getOperationTokenType();
     final String comparison = ComparisonUtils.getStringForComparison(tokenType);