diff --git a/java/java-impl/src/com/intellij/refactoring/IntroduceHandlerBase.java b/java/java-impl/src/com/intellij/refactoring/IntroduceHandlerBase.java
index dd02795a8ef2..279fc3f7a466 100644
--- a/java/java-impl/src/com/intellij/refactoring/IntroduceHandlerBase.java
+++ b/java/java-impl/src/com/intellij/refactoring/IntroduceHandlerBase.java
@@ -29,7 +29,7 @@ import org.jetbrains.annotations.TestOnly;
 /**
  * @author dsl
  */
-public abstract class IntroduceHandlerBase {
+public abstract class IntroduceHandlerBase implements RefactoringActionHandler {
   private static final Logger LOG = Logger.getInstance("#com.intellij.refactoring.IntroduceHandlerBase");
 
   public void invoke(@NotNull Project project, @NotNull PsiElement[] elements, DataContext dataContext) {
diff --git a/java/java-impl/src/com/intellij/refactoring/introduceField/BaseExpressionToFieldHandler.java b/java/java-impl/src/com/intellij/refactoring/introduceField/BaseExpressionToFieldHandler.java
index c1d80959ea01..c628f9454cc5 100644
--- a/java/java-impl/src/com/intellij/refactoring/introduceField/BaseExpressionToFieldHandler.java
+++ b/java/java-impl/src/com/intellij/refactoring/introduceField/BaseExpressionToFieldHandler.java
@@ -57,7 +57,6 @@ import com.intellij.psi.util.PsiTreeUtil;
 import com.intellij.psi.util.PsiUtil;
 import com.intellij.psi.util.PsiUtilBase;
 import com.intellij.refactoring.IntroduceHandlerBase;
-import com.intellij.refactoring.RefactoringActionHandler;
 import com.intellij.refactoring.RefactoringBundle;
 import com.intellij.refactoring.introduceVariable.IntroduceVariableBase;
 import com.intellij.refactoring.rename.RenameJavaVariableProcessor;
@@ -75,7 +74,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 
-public abstract class BaseExpressionToFieldHandler extends IntroduceHandlerBase implements RefactoringActionHandler {
+public abstract class BaseExpressionToFieldHandler extends IntroduceHandlerBase {
   private static final Logger LOG = Logger.getInstance("#com.intellij.refactoring.introduceField.BaseExpressionToFieldHandler");
 
   public enum InitializationPlace {
diff --git a/java/java-impl/src/com/intellij/refactoring/introduceParameter/IntroduceParameterHandler.java b/java/java-impl/src/com/intellij/refactoring/introduceParameter/IntroduceParameterHandler.java
index 6884d404e2d7..92dea0bcf3b5 100644
--- a/java/java-impl/src/com/intellij/refactoring/introduceParameter/IntroduceParameterHandler.java
+++ b/java/java-impl/src/com/intellij/refactoring/introduceParameter/IntroduceParameterHandler.java
@@ -78,7 +78,7 @@ import java.util.Collections;
 import java.util.List;
 
 
-public class IntroduceParameterHandler extends IntroduceHandlerBase implements RefactoringActionHandler {
+public class IntroduceParameterHandler extends IntroduceHandlerBase {
   private static final Logger LOG = Logger.getInstance("#com.intellij.refactoring.introduceParameter.IntroduceParameterHandler");
   static final String REFACTORING_NAME = RefactoringBundle.message("introduce.parameter.title");
   private JBPopup myEnclosingMethodsPopup;
diff --git a/java/java-impl/src/com/intellij/refactoring/introduceVariable/IntroduceVariableBase.java b/java/java-impl/src/com/intellij/refactoring/introduceVariable/IntroduceVariableBase.java
index ca1365e05f9a..7b719ed8affa 100644
--- a/java/java-impl/src/com/intellij/refactoring/introduceVariable/IntroduceVariableBase.java
+++ b/java/java-impl/src/com/intellij/refactoring/introduceVariable/IntroduceVariableBase.java
@@ -71,7 +71,7 @@ import java.util.*;
  * @author dsl
  * Date: Nov 15, 2002
  */
-public abstract class IntroduceVariableBase extends IntroduceHandlerBase implements RefactoringActionHandler {
+public abstract class IntroduceVariableBase extends IntroduceHandlerBase {
   private static final Logger LOG = Logger.getInstance("#com.intellij.refactoring.introduceVariable.IntroduceVariableBase");
   @NonNls private static final String PREFER_STATEMENTS_OPTION = "introduce.variable.prefer.statements";