diff --git a/src/main/java/gr/uom/java/xmi/decomposition/AbstractCodeMapping.java b/src/main/java/gr/uom/java/xmi/decomposition/AbstractCodeMapping.java
index 94014c8ed..857c873b9 100644
--- a/src/main/java/gr/uom/java/xmi/decomposition/AbstractCodeMapping.java
+++ b/src/main/java/gr/uom/java/xmi/decomposition/AbstractCodeMapping.java
@@ -53,6 +53,7 @@ public abstract class AbstractCodeMapping implements LeafMappingProvider {
 	private int matchingArgumentsWithOperationInvocation;
 	private boolean matchedWithNullReplacements;
 	private Set<UMLAnonymousClassDiff> anonymousClassDiffs = new LinkedHashSet<UMLAnonymousClassDiff>();
+	private List<UMLOperationBodyMapper> lambdaMappers = new ArrayList<UMLOperationBodyMapper>();
 	
 	public AbstractCodeMapping(AbstractCodeFragment fragment1, AbstractCodeFragment fragment2,
 			VariableDeclarationContainer operation1, VariableDeclarationContainer operation2) {
@@ -106,6 +107,14 @@ public Set<UMLAnonymousClassDiff> getAnonymousClassDiffs() {
 		return anonymousClassDiffs;
 	}
 
+	public void addLambdaMappers(List<UMLOperationBodyMapper> mappers) {
+		lambdaMappers.addAll(mappers);
+	}
+
+	public List<UMLOperationBodyMapper> getLambdaMappers() {
+		return lambdaMappers;
+	}
+
 	public boolean containsRefactoringOfType(RefactoringType type) {
 		for(Refactoring r : refactorings) {
 			if(r.getRefactoringType().equals(type)) {
diff --git a/src/main/java/gr/uom/java/xmi/decomposition/UMLOperationBodyMapper.java b/src/main/java/gr/uom/java/xmi/decomposition/UMLOperationBodyMapper.java
index aff7c7c6a..f5f76b223 100644
--- a/src/main/java/gr/uom/java/xmi/decomposition/UMLOperationBodyMapper.java
+++ b/src/main/java/gr/uom/java/xmi/decomposition/UMLOperationBodyMapper.java
@@ -4140,6 +4140,14 @@ public Set<Replacement> getReplacementsOfType(ReplacementType type) {
 		return replacements;
 	}
 
+	public boolean containsLambdaMapper() {
+		for(AbstractCodeMapping mapping : getMappings()) {
+			if(mapping.getLambdaMappers().size() > 0 && !mapping.getFragment1().getString().equals(mapping.getFragment2().getString()))
+				return true;
+		}
+		return false;
+	}
+
 	public boolean containsCompositeMappingWithoutReplacements() {
 		for(AbstractCodeMapping mapping : getMappings()) {
 			if(mapping instanceof CompositeStatementObjectMapping && !mapping.getFragment1().equalFragment(mapping.getFragment2()) && mapping.getReplacements().isEmpty()) {
@@ -4793,6 +4801,7 @@ else if(replacements.size() == 1 && replacementInfo.getReplacements(ReplacementT
 											if(score2 > 0) {
 												CompositeStatementObjectMapping mapping = createCompositeMapping(matchingInnerNode1, statement2, parameterToArgumentMap, score2);
 												mapping.addReplacements(replacements2);
+												mapping.addLambdaMappers(replacementInfo2.getLambdaMappers());
 												mapping.addSubExpressionMappings(replacementInfo2.getSubExpressionMappings());
 												mappingSet.add(mapping);
 											}
@@ -4804,6 +4813,7 @@ else if(replacements.size() == 1 && replacementInfo.getReplacements(ReplacementT
 									(score > 0 || Math.max(statement1.getStatements().size(), statement2.getStatements().size()) == 0)) {
 								CompositeStatementObjectMapping mapping = createCompositeMapping(statement1, statement2, parameterToArgumentMap, score);
 								mapping.addReplacements(replacements);
+								mapping.addLambdaMappers(replacementInfo.getLambdaMappers());
 								mapping.addSubExpressionMappings(replacementInfo.getSubExpressionMappings());
 								UMLAbstractClassDiff classDiff = this.classDiff != null ? this.classDiff : parentMapper != null ? parentMapper.classDiff : null;
 								for(AbstractCodeFragment leaf : leaves2) {
@@ -4849,6 +4859,7 @@ else if(replacements.size() == 1 && replacementInfo.getReplacements(ReplacementT
 							}
 							else if(replacements == null && !containsCallToExtractedMethod && statement1.getLocationInfo().getCodeElementType().equals(statement2.getLocationInfo().getCodeElementType()) && score > 0 && mappingSet.size() > 0 && score >= 2.0*mappingSet.first().getCompositeChildMatchingScore()) {
 								CompositeStatementObjectMapping mapping = createCompositeMapping(statement1, statement2, parameterToArgumentMap, score);
+								mapping.addLambdaMappers(replacementInfo.getLambdaMappers());
 								mapping.addSubExpressionMappings(replacementInfo.getSubExpressionMappings());
 								mappingSet.add(mapping);
 							}
@@ -5148,6 +5159,7 @@ else if(replacements.size() == 1 && replacementInfo.getReplacements(ReplacementT
 											if(score2 > 0) {
 												CompositeStatementObjectMapping mapping = createCompositeMapping(statement1, matchingInnerNode2, parameterToArgumentMap, score2);
 												mapping.addReplacements(replacements2);
+												mapping.addLambdaMappers(replacementInfo2.getLambdaMappers());
 												mapping.addSubExpressionMappings(replacementInfo2.getSubExpressionMappings());
 												mappingSet.add(mapping);
 											}
@@ -5159,6 +5171,7 @@ else if(replacements.size() == 1 && replacementInfo.getReplacements(ReplacementT
 									(score > 0 || Math.max(statement1.getStatements().size(), statement2.getStatements().size()) == 0)) {
 								CompositeStatementObjectMapping mapping = createCompositeMapping(statement1, statement2, parameterToArgumentMap, score);
 								mapping.addReplacements(replacements);
+								mapping.addLambdaMappers(replacementInfo.getLambdaMappers());
 								mapping.addSubExpressionMappings(replacementInfo.getSubExpressionMappings());
 								UMLAbstractClassDiff classDiff = this.classDiff != null ? this.classDiff : parentMapper != null ? parentMapper.classDiff : null;
 								for(AbstractCodeFragment leaf : leaves2) {
@@ -5195,6 +5208,7 @@ else if(replacements.size() == 1 && replacementInfo.getReplacements(ReplacementT
 							}
 							else if(replacements == null && !containsCallToExtractedMethod && statement1.getLocationInfo().getCodeElementType().equals(statement2.getLocationInfo().getCodeElementType()) && score > 0 && mappingSet.size() > 0 && score >= 2.0*mappingSet.first().getCompositeChildMatchingScore()) {
 								CompositeStatementObjectMapping mapping = createCompositeMapping(statement1, statement2, parameterToArgumentMap, score);
+								mapping.addLambdaMappers(replacementInfo.getLambdaMappers());
 								mapping.addSubExpressionMappings(replacementInfo.getSubExpressionMappings());
 								mappingSet.add(mapping);
 							}
@@ -5363,6 +5377,7 @@ else if(comp.getLocationInfo().getCodeElementType().equals(CodeElementType.IF_ST
 							if(score > 0) {
 								CompositeStatementObjectMapping newMapping = createCompositeMapping((CompositeStatementObject)mapping.getFragment1(), innerNode2, parameterToArgumentMap, score);
 								newMapping.addReplacements(replacementInfo.getReplacements());
+								mapping.addLambdaMappers(replacementInfo.getLambdaMappers());
 								newMapping.addSubExpressionMappings(replacementInfo.getSubExpressionMappings());
 								addMapping(newMapping);
 								mappingsToBeRemoved.add(mapping);
@@ -6221,6 +6236,7 @@ else if(mapping.getFragment1().getLocationInfo().getStartLine() > endMapping.get
 							if (replacements != null) {
 								LeafMapping mapping = createLeafMapping(leaf1, leaf2, parameterToArgumentMap, equalNumberOfAssertions);
 								mapping.addReplacements(replacements);
+								mapping.addLambdaMappers(replacementInfo.getLambdaMappers());
 								mapping.addSubExpressionMappings(replacementInfo.getSubExpressionMappings());
 								extractInlineVariableAnalysis(leaves1, leaves2, leaf1, leaf2, mapping, replacementInfo);
 								mappingSet.add(mapping);
@@ -6688,6 +6704,7 @@ else if(mapping.getFragment1().getLocationInfo().getStartLine() > endMapping.get
 							if (replacements != null) {
 								LeafMapping mapping = createLeafMapping(leaf1, leaf2, parameterToArgumentMap, equalNumberOfAssertions);
 								mapping.addReplacements(replacements);
+								mapping.addLambdaMappers(replacementInfo.getLambdaMappers());
 								mapping.addSubExpressionMappings(replacementInfo.getSubExpressionMappings());
 								extractInlineVariableAnalysis(leaves1, leaves2, leaf1, leaf2, mapping, replacementInfo);
 								mappingSet.add(mapping);
@@ -7174,6 +7191,7 @@ else if(r1 instanceof MethodInvocationReplacement && r2 instanceof MethodInvocat
 					if(matchingMappings == mappingSet.size() || matchWithLessReplacements || differentVariableDeclarationNumber) {
 						LeafMapping mapping = createLeafMapping(leaf, leaf2, parameterToArgumentMap, equalNumberOfAssertions);
 						mapping.addReplacements(replacements);
+						mapping.addLambdaMappers(replacementInfo.getLambdaMappers());
 						mapping.addSubExpressionMappings(replacementInfo.getSubExpressionMappings());
 						extractInlineVariableAnalysis(leaves1, leaves2, leaf, leaf2, mapping, replacementInfo);
 						mappingSet.add(mapping);
@@ -7244,6 +7262,7 @@ private void checkForOtherPossibleMatchesForFragment1(List<? extends AbstractCod
 					if (replacements != null) {
 						LeafMapping mapping = createLeafMapping(leaf1, leaf, parameterToArgumentMap, equalNumberOfAssertions);
 						mapping.addReplacements(replacements);
+						mapping.addLambdaMappers(replacementInfo.getLambdaMappers());
 						mapping.addSubExpressionMappings(replacementInfo.getSubExpressionMappings());
 						boolean allowAdd = false;
 						for(LeafMapping m : mappingSet) {
@@ -7278,6 +7297,7 @@ else if(parent1 == null && (parent2 == null || parent2.getParent() == null) && (
 					if (replacements != null) {
 						LeafMapping mapping = createLeafMapping(leaf1, leaf, parameterToArgumentMap, equalNumberOfAssertions);
 						mapping.addReplacements(replacements);
+						mapping.addLambdaMappers(replacementInfo.getLambdaMappers());
 						mapping.addSubExpressionMappings(replacementInfo.getSubExpressionMappings());
 						extractInlineVariableAnalysis(leaves1, leaves2, leaf1, leaf, mapping, replacementInfo);
 						mappingSet.add(mapping);
@@ -7360,6 +7380,7 @@ else if(exactMappingsBefore + inexactMappingsBefore < exactMappingsAfter + inexa
 					if (replacements != null) {
 						LeafMapping mapping = createLeafMapping(leaf1, leaf, parameterToArgumentMap, equalNumberOfAssertions);
 						mapping.addReplacements(replacements);
+						mapping.addLambdaMappers(replacementInfo.getLambdaMappers());
 						mapping.addSubExpressionMappings(replacementInfo.getSubExpressionMappings());
 						int lineDistance = 0;
 						if(exactMappingsBefore + inexactMappingsBefore == 0 && callsToExtractedMethod == 1) {
@@ -7448,6 +7469,7 @@ else if(exactMappingsBefore + inexactMappingsBefore < exactMappingsAfter + inexa
 					if (replacements != null) {
 						LeafMapping mapping = createLeafMapping(leaf, leaf2, parameterToArgumentMap, equalNumberOfAssertions);
 						mapping.addReplacements(replacements);
+						mapping.addLambdaMappers(replacementInfo.getLambdaMappers());
 						mapping.addSubExpressionMappings(replacementInfo.getSubExpressionMappings());
 						int lineDistance = 0;
 						if(exactMappingsBefore + inexactMappingsBefore == 0 && callsToInlinedMethod == 1) {
diff --git a/src/main/java/gr/uom/java/xmi/diff/ExtractOperationDetection.java b/src/main/java/gr/uom/java/xmi/diff/ExtractOperationDetection.java
index 76946ee54..4e21535c0 100644
--- a/src/main/java/gr/uom/java/xmi/diff/ExtractOperationDetection.java
+++ b/src/main/java/gr/uom/java/xmi/diff/ExtractOperationDetection.java
@@ -121,7 +121,7 @@ public List<ExtractOperationRefactoring> check(UMLOperation addedOperation) thro
 			return refactorings;
 		}
 		if(!mapper.getNonMappedLeavesT1().isEmpty() || !mapper.getNonMappedInnerNodesT1().isEmpty() ||
-			!mapper.getReplacementsInvolvingMethodInvocation().isEmpty() || mapper.containsCompositeMappingWithoutReplacements()) {
+			!mapper.getReplacementsInvolvingMethodInvocation().isEmpty() || mapper.containsCompositeMappingWithoutReplacements() || mapper.containsLambdaMapper()) {
 			List<AbstractCall> addedOperationInvocations = callCountMap != null ? callCountMap.get(addedOperation) : matchingInvocations(addedOperation, operationInvocations, mapper.getContainer2());
 			if(addedOperationInvocations.size() > 0) {
 				int otherAddedMethodsCalled = 0;