diff --git a/jps/jps-builders/src/org/jetbrains/jps/packaging/jlink/JpsJLinkProperties.java b/jps/jps-builders/src/org/jetbrains/jps/packaging/jlink/JpsJLinkProperties.java
index df366f3fe2e6..c51cedd7343d 100644
--- a/jps/jps-builders/src/org/jetbrains/jps/packaging/jlink/JpsJLinkProperties.java
+++ b/jps/jps-builders/src/org/jetbrains/jps/packaging/jlink/JpsJLinkProperties.java
@@ -30,11 +30,6 @@ final class JpsJLinkProperties extends JpsElementBase<JpsJLinkProperties> {
     return new JpsJLinkProperties(this);
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsJLinkProperties modified) {
-    copyToThis(modified);
-  }
-
   private void copyToThis(@NotNull JpsJLinkProperties copy) {
     compressionLevel = copy.compressionLevel;
     verbose = copy.verbose;
diff --git a/jps/model-api/src/org/jetbrains/jps/model/ex/JpsCompositeElementBase.java b/jps/model-api/src/org/jetbrains/jps/model/ex/JpsCompositeElementBase.java
index 0abc2c9d47c7..9ac6c601fc96 100644
--- a/jps/model-api/src/org/jetbrains/jps/model/ex/JpsCompositeElementBase.java
+++ b/jps/model-api/src/org/jetbrains/jps/model/ex/JpsCompositeElementBase.java
@@ -30,11 +30,6 @@ public abstract class JpsCompositeElementBase<Self extends JpsCompositeElementBa
     myContainer = JpsExElementFactory.getInstance().createContainerCopy(original.myContainer, this);
   }
 
-  @Override
-  public void applyChanges(@NotNull Self modified) {
-    myContainer.applyChanges(modified.myContainer);
-  }
-
   @Override
   @NotNull
   public JpsElementContainer getContainer() {
diff --git a/jps/model-api/src/org/jetbrains/jps/model/ex/JpsElementContainerEx.java b/jps/model-api/src/org/jetbrains/jps/model/ex/JpsElementContainerEx.java
index b4e14d05d775..5b6c3d8404bc 100644
--- a/jps/model-api/src/org/jetbrains/jps/model/ex/JpsElementContainerEx.java
+++ b/jps/model-api/src/org/jetbrains/jps/model/ex/JpsElementContainerEx.java
@@ -25,6 +25,4 @@ public abstract class JpsElementContainerEx implements JpsElementContainer {
   protected abstract Object getDataLock();
 
   protected abstract Map<JpsElementChildRole<?>, JpsElement> getElementsMap();
-
-  protected abstract void applyChanges(JpsElementContainerEx modified);
 }
diff --git a/jps/model-api/src/org/jetbrains/jps/model/ex/JpsNamedCompositeElementBase.java b/jps/model-api/src/org/jetbrains/jps/model/ex/JpsNamedCompositeElementBase.java
index 3ec89a589a2b..75140540f1ce 100644
--- a/jps/model-api/src/org/jetbrains/jps/model/ex/JpsNamedCompositeElementBase.java
+++ b/jps/model-api/src/org/jetbrains/jps/model/ex/JpsNamedCompositeElementBase.java
@@ -39,12 +39,6 @@ public abstract class JpsNamedCompositeElementBase<Self extends JpsNamedComposit
     return myName;
   }
 
-  @Override
-  public void applyChanges(@NotNull Self modified) {
-    super.applyChanges(modified);
-    setName(modified.getName());
-  }
-
   @Override
   public void setName(@NlsSafe @NotNull String name) {
     myName = name;
diff --git a/jps/model-api/src/org/jetbrains/jps/model/java/JavaResourceRootProperties.java b/jps/model-api/src/org/jetbrains/jps/model/java/JavaResourceRootProperties.java
index 2e48e23939d1..a47a9405ce10 100644
--- a/jps/model-api/src/org/jetbrains/jps/model/java/JavaResourceRootProperties.java
+++ b/jps/model-api/src/org/jetbrains/jps/model/java/JavaResourceRootProperties.java
@@ -1,10 +1,11 @@
 // Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.jps.model.java;
 
-import java.util.Objects;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jps.model.ex.JpsElementBase;
 
+import java.util.Objects;
+
 public class JavaResourceRootProperties extends JpsElementBase<JavaResourceRootProperties> {
   private String myRelativeOutputPath = "";
   private boolean myForGeneratedSources;
@@ -45,10 +46,4 @@ public class JavaResourceRootProperties extends JpsElementBase<JavaResourceRootP
       fireElementChanged();
     }
   }
-
-  @Override
-  public void applyChanges(@NotNull JavaResourceRootProperties modified) {
-    setRelativeOutputPath(modified.myRelativeOutputPath);
-    setForGeneratedSources(modified.myForGeneratedSources);
-  }
 }
diff --git a/jps/model-api/src/org/jetbrains/jps/model/java/JavaSourceRootProperties.java b/jps/model-api/src/org/jetbrains/jps/model/java/JavaSourceRootProperties.java
index 37282473007a..4506af7f242a 100644
--- a/jps/model-api/src/org/jetbrains/jps/model/java/JavaSourceRootProperties.java
+++ b/jps/model-api/src/org/jetbrains/jps/model/java/JavaSourceRootProperties.java
@@ -50,10 +50,4 @@ public class JavaSourceRootProperties extends JpsElementBase<JavaSourceRootPrope
       fireElementChanged();
     }
   }
-
-  @Override
-  public void applyChanges(@NotNull JavaSourceRootProperties modified) {
-    setPackagePrefix(modified.myPackagePrefix);
-    setForGeneratedSources(modified.myForGeneratedSources);
-  }
 }
diff --git a/jps/model-api/src/org/jetbrains/jps/model/module/UnknownSourceRootTypeProperties.java b/jps/model-api/src/org/jetbrains/jps/model/module/UnknownSourceRootTypeProperties.java
index aacb376d64d6..7c09691b742c 100644
--- a/jps/model-api/src/org/jetbrains/jps/model/module/UnknownSourceRootTypeProperties.java
+++ b/jps/model-api/src/org/jetbrains/jps/model/module/UnknownSourceRootTypeProperties.java
@@ -23,9 +23,4 @@ public class UnknownSourceRootTypeProperties<Data> extends JpsElementBase<Unknow
   public UnknownSourceRootTypeProperties<Data> createCopy() {
     return new UnknownSourceRootTypeProperties<>(myPropertiesData);
   }
-
-  @Override
-  public void applyChanges(@NotNull UnknownSourceRootTypeProperties modified) {
-    // not supported
-  }
 }
diff --git a/jps/model-impl/src/com/intellij/platform/jps/model/impl/resolver/JpsDependencyResolverConfigurationImpl.java b/jps/model-impl/src/com/intellij/platform/jps/model/impl/resolver/JpsDependencyResolverConfigurationImpl.java
index bb963e6c6f06..5d0232d5bedd 100644
--- a/jps/model-impl/src/com/intellij/platform/jps/model/impl/resolver/JpsDependencyResolverConfigurationImpl.java
+++ b/jps/model-impl/src/com/intellij/platform/jps/model/impl/resolver/JpsDependencyResolverConfigurationImpl.java
@@ -53,10 +53,4 @@ public class JpsDependencyResolverConfigurationImpl extends JpsElementBase<JpsDe
   public @NotNull JpsDependencyResolverConfigurationImpl createCopy() {
     return new JpsDependencyResolverConfigurationImpl(this);
   }
-
-  @Override
-  public void applyChanges(@NotNull JpsDependencyResolverConfigurationImpl modified) {
-    this.checksumVerificationEnabled = modified.checksumVerificationEnabled;
-    this.bindRepositoryEnabled = modified.bindRepositoryEnabled;
-  }
 }
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/artifact/impl/elements/JpsExtractedDirectoryPackagingElementImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/artifact/impl/elements/JpsExtractedDirectoryPackagingElementImpl.java
index 8edca931cab6..b9af2ebcd755 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/artifact/impl/elements/JpsExtractedDirectoryPackagingElementImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/artifact/impl/elements/JpsExtractedDirectoryPackagingElementImpl.java
@@ -1,10 +1,11 @@
 // Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.jps.model.artifact.impl.elements;
 
-import java.util.Objects;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jps.model.artifact.elements.JpsExtractedDirectoryPackagingElement;
 
+import java.util.Objects;
+
 public class JpsExtractedDirectoryPackagingElementImpl extends JpsFileCopyPackagingElementBase<JpsExtractedDirectoryPackagingElementImpl>
   implements JpsExtractedDirectoryPackagingElement {
   private String myPathInJar;
@@ -20,12 +21,6 @@ public class JpsExtractedDirectoryPackagingElementImpl extends JpsFileCopyPackag
     return new JpsExtractedDirectoryPackagingElementImpl(myFilePath, myPathInJar);
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsExtractedDirectoryPackagingElementImpl modified) {
-    super.applyChanges(modified);
-    setPathInJar(modified.myPathInJar);
-  }
-
   @Override
   public String getPathInJar() {
     return myPathInJar;
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/artifact/impl/elements/JpsFileCopyPackagingElementBase.java b/jps/model-impl/src/org/jetbrains/jps/model/artifact/impl/elements/JpsFileCopyPackagingElementBase.java
index 89295b3f0810..fc667b70fe2b 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/artifact/impl/elements/JpsFileCopyPackagingElementBase.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/artifact/impl/elements/JpsFileCopyPackagingElementBase.java
@@ -1,11 +1,11 @@
 // Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.jps.model.artifact.impl.elements;
 
-import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jps.model.artifact.elements.JpsPackagingElement;
 import org.jetbrains.jps.model.ex.JpsElementBase;
 
+import java.util.Objects;
+
 public abstract class JpsFileCopyPackagingElementBase<Self extends JpsFileCopyPackagingElementBase<Self>> extends JpsElementBase<Self> implements
                                                                                                                                  JpsPackagingElement {
   protected String myFilePath;
@@ -14,11 +14,6 @@ public abstract class JpsFileCopyPackagingElementBase<Self extends JpsFileCopyPa
     myFilePath = filePath;
   }
 
-  @Override
-  public void applyChanges(@NotNull Self modified) {
-    setFilePath(modified.myFilePath);
-  }
-
   public String getFilePath() {
     return myFilePath;
   }
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/artifact/impl/elements/JpsFileCopyPackagingElementImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/artifact/impl/elements/JpsFileCopyPackagingElementImpl.java
index 0da9aa4dc216..791646306281 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/artifact/impl/elements/JpsFileCopyPackagingElementImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/artifact/impl/elements/JpsFileCopyPackagingElementImpl.java
@@ -1,10 +1,11 @@
 // Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.jps.model.artifact.impl.elements;
 
-import java.util.Objects;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jps.model.artifact.elements.JpsFileCopyPackagingElement;
 
+import java.util.Objects;
+
 public class JpsFileCopyPackagingElementImpl extends JpsFileCopyPackagingElementBase<JpsFileCopyPackagingElementImpl> implements JpsFileCopyPackagingElement {
   private String myRenamedOutputFileName;
 
@@ -19,12 +20,6 @@ public class JpsFileCopyPackagingElementImpl extends JpsFileCopyPackagingElement
     return new JpsFileCopyPackagingElementImpl(myFilePath, myRenamedOutputFileName);
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsFileCopyPackagingElementImpl modified) {
-    super.applyChanges(modified);
-    setRenamedOutputFileName(modified.myRenamedOutputFileName);
-  }
-
   @Override
   public String getRenamedOutputFileName() {
     return myRenamedOutputFileName;
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/ex/JpsElementContainerImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/ex/JpsElementContainerImpl.java
index adc0506dbb29..46971d724dee 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/ex/JpsElementContainerImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/ex/JpsElementContainerImpl.java
@@ -5,8 +5,6 @@ import com.intellij.util.containers.CollectionFactory;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jps.model.*;
 
-import java.util.ArrayList;
-import java.util.Collection;
 import java.util.Map;
 import java.util.function.Supplier;
 
@@ -110,45 +108,4 @@ public class JpsElementContainerImpl extends JpsElementContainerEx implements Jp
   protected final Map<JpsElementChildRole<?>, JpsElement> getElementsMap() {
     return myElements;
   }
-
-  @Override
-  public void applyChanges(@NotNull JpsElementContainerEx modified) {
-    final Collection<JpsElementChildRole<?>> roles = new ArrayList<>();
-
-    synchronized (myDataLock) {
-      roles.addAll(myElements.keySet());
-    }
-    for (JpsElementChildRole<?> role : roles) {
-      applyChanges(role, modified);
-    }
-
-    roles.clear();
-    synchronized (modified.getDataLock()) {
-      roles.addAll(modified.getElementsMap().keySet());
-    }
-    synchronized (myDataLock) {
-      roles.removeAll(myElements.keySet());
-    }
-
-    for (JpsElementChildRole<?> role : roles) {
-      applyChanges(role, modified);
-    }
-  }
-
-  private <T extends JpsElement> void applyChanges(JpsElementChildRole<T> role, JpsElementContainerEx modified) {
-    final T child = getChild(role);
-    final T modifiedChild = modified.getChild(role);
-    if (child != null && modifiedChild != null) {
-      final JpsElement.BulkModificationSupport modificationSupport = child.getBulkModificationSupport();
-      //noinspection unchecked
-      modificationSupport.applyChanges(modifiedChild);
-    }
-    else if (modifiedChild == null) {
-      removeChild(role);
-    }
-    else {
-      //noinspection unchecked
-      setChild(role, (T)modifiedChild.getBulkModificationSupport().createCopy());
-    }
-  }
 }
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsDummyElementImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsDummyElementImpl.java
index a27b9ca2a29d..982b8703bf19 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsDummyElementImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsDummyElementImpl.java
@@ -25,8 +25,4 @@ public final class JpsDummyElementImpl extends JpsElementBase<JpsDummyElementImp
   public JpsDummyElementImpl createCopy() {
     return new JpsDummyElementImpl();
   }
-
-  @Override
-  public void applyChanges(@NotNull JpsDummyElementImpl modified) {
-  }
 }
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsElementCollectionImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsElementCollectionImpl.java
index a3a50be1cf28..beb484dd56d6 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsElementCollectionImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsElementCollectionImpl.java
@@ -75,32 +75,6 @@ public final class JpsElementCollectionImpl<E extends JpsElement> extends JpsEle
     return new JpsElementCollectionImpl<>(this);
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsElementCollectionImpl<E> modified) {
-    Set<E> toRemove = new LinkedHashSet<>(myElements);
-    List<E> toAdd = new ArrayList<>();
-    final Map<E, E> copyToOriginal = modified.myCopyToOriginal;
-    for (E element : modified.myElements) {
-      final E original = copyToOriginal != null ? copyToOriginal.get(element) : null;
-      if (original != null) {
-        //noinspection unchecked
-        ((BulkModificationSupport<E>)original.getBulkModificationSupport()).applyChanges(element);
-        toRemove.remove(original);
-      }
-      else {
-        //noinspection unchecked
-        final E copy = (E)element.getBulkModificationSupport().createCopy();
-        toAdd.add(copy);
-      }
-    }
-    for (E e : toRemove) {
-      removeChild(e);
-    }
-    for (E e : toAdd) {
-      addChild(e);
-    }
-  }
-
   private final class JpsElementIterable<X extends JpsTypedElement<P>, P extends JpsElement> implements Iterable<X> {
     private final JpsElementType<? extends JpsElement> myType;
 
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsEncodingProjectConfigurationImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsEncodingProjectConfigurationImpl.java
index e8d31d23f558..2e4be4be0558 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsEncodingProjectConfigurationImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsEncodingProjectConfigurationImpl.java
@@ -110,8 +110,4 @@ public final class JpsEncodingProjectConfigurationImpl extends JpsElementBase<Jp
   public JpsEncodingProjectConfigurationImpl createCopy() {
     return new JpsEncodingProjectConfigurationImpl(myUrlToEncoding, myProjectEncoding);
   }
-
-  @Override
-  public void applyChanges(@NotNull JpsEncodingProjectConfigurationImpl modified) {
-  }
 }
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsExcludePatternImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsExcludePatternImpl.java
index 3dd97a5ca6b7..1abe3ba911e1 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsExcludePatternImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsExcludePatternImpl.java
@@ -45,8 +45,4 @@ public final class JpsExcludePatternImpl extends JpsElementBase<JpsExcludePatter
   public JpsExcludePatternImpl createCopy() {
     return new JpsExcludePatternImpl(myBaseDirUrl, myPattern);
   }
-
-  @Override
-  public void applyChanges(@NotNull JpsExcludePatternImpl modified) {
-  }
 }
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsFileTypesConfigurationImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsFileTypesConfigurationImpl.java
index 9ff4c6104bfd..e735509a801e 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsFileTypesConfigurationImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsFileTypesConfigurationImpl.java
@@ -51,9 +51,4 @@ public final class JpsFileTypesConfigurationImpl extends JpsElementBase<JpsFileT
       fireElementChanged();
     }
   }
-
-  @Override
-  public void applyChanges(@NotNull JpsFileTypesConfigurationImpl modified) {
-    setIgnoredPatternString(modified.myIgnoredPatternString);
-  }
 }
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsGlobalElementReference.java b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsGlobalElementReference.java
index 081c1ccadd35..d7f135ad3a2d 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsGlobalElementReference.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsGlobalElementReference.java
@@ -33,10 +33,6 @@ public final class JpsGlobalElementReference extends JpsElementReferenceBase<Jps
     return new JpsGlobalElementReference();
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsGlobalElementReference modified) {
-  }
-
   @Override
   public String toString() {
     return "global ref";
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsProjectElementReference.java b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsProjectElementReference.java
index ca441a5f8c71..f47d19c9a8ec 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsProjectElementReference.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsProjectElementReference.java
@@ -33,10 +33,6 @@ public final class JpsProjectElementReference extends JpsElementReferenceBase<Jp
     return new JpsProjectElementReference();
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsProjectElementReference modified) {
-  }
-
   @Override
   public String toString() {
     return "project ref";
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsSimpleElementImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsSimpleElementImpl.java
index ce0f5fbdbe0f..6ef7a5eda810 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsSimpleElementImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsSimpleElementImpl.java
@@ -49,9 +49,4 @@ public final class JpsSimpleElementImpl<D> extends JpsElementBase<JpsSimpleEleme
   public JpsSimpleElementImpl<D> createCopy() {
     return new JpsSimpleElementImpl<>(this);
   }
-
-  @Override
-  public void applyChanges(@NotNull JpsSimpleElementImpl<D> modified) {
-    setData(modified.getData());
-  }
 }
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsUrlListImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsUrlListImpl.java
index 97d285628802..1eba9bc54993 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsUrlListImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/impl/JpsUrlListImpl.java
@@ -55,13 +55,4 @@ public final class JpsUrlListImpl extends JpsElementBase<JpsUrlListImpl> impleme
     myUrls.remove(url);
     fireElementChanged();
   }
-
-  @Override
-  public void applyChanges(@NotNull JpsUrlListImpl modified) {
-    if (!myUrls.equals(modified.myUrls)) {
-      myUrls.clear();
-      myUrls.addAll(modified.myUrls);
-      fireElementChanged();
-    }
-  }
 }
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/jarRepository/impl/JpsRemoteRepositoriesConfigurationImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/jarRepository/impl/JpsRemoteRepositoriesConfigurationImpl.java
index 065cc9883d84..1ecd3972c451 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/jarRepository/impl/JpsRemoteRepositoriesConfigurationImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/jarRepository/impl/JpsRemoteRepositoriesConfigurationImpl.java
@@ -37,11 +37,6 @@ public final class JpsRemoteRepositoriesConfigurationImpl extends JpsElementBase
     return new JpsRemoteRepositoriesConfigurationImpl(repositories);
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsRemoteRepositoriesConfigurationImpl modified) {
-    setRepositories(modified.getRepositories());
-  }
-
   @Override
   public List<JpsRemoteRepositoryDescription> getRepositories() {
     return Collections.unmodifiableList(repositories);
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/java/impl/ExplodedDirectoryModuleExtensionImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/java/impl/ExplodedDirectoryModuleExtensionImpl.java
index ccbca1c6aac7..ab307a690af2 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/java/impl/ExplodedDirectoryModuleExtensionImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/java/impl/ExplodedDirectoryModuleExtensionImpl.java
@@ -1,13 +1,14 @@
 // Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.jps.model.java.impl;
 
-import java.util.Objects;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jps.model.JpsElementCreator;
 import org.jetbrains.jps.model.ex.JpsElementBase;
 import org.jetbrains.jps.model.ex.JpsElementChildRoleBase;
 import org.jetbrains.jps.model.java.ExplodedDirectoryModuleExtension;
 
+import java.util.Objects;
+
 public class ExplodedDirectoryModuleExtensionImpl extends JpsElementBase<ExplodedDirectoryModuleExtensionImpl> implements
                                                                                                                ExplodedDirectoryModuleExtension {
   private String myExplodedUrl;
@@ -53,12 +54,6 @@ public class ExplodedDirectoryModuleExtensionImpl extends JpsElementBase<Explode
     return new ExplodedDirectoryModuleExtensionImpl(this);
   }
 
-  @Override
-  public void applyChanges(@NotNull ExplodedDirectoryModuleExtensionImpl modified) {
-    setExcludeExploded(modified.myExcludeExploded);
-    setExplodedUrl(modified.myExplodedUrl);
-  }
-
   public static class ExplodedDirectoryModuleExtensionRole extends JpsElementChildRoleBase<ExplodedDirectoryModuleExtension> implements JpsElementCreator<ExplodedDirectoryModuleExtension> {
     public static final ExplodedDirectoryModuleExtensionRole INSTANCE = new ExplodedDirectoryModuleExtensionRole();
 
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JavaModuleIndexImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JavaModuleIndexImpl.java
index ddadb4eeae14..53a32e564a14 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JavaModuleIndexImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JavaModuleIndexImpl.java
@@ -37,11 +37,6 @@ public class JavaModuleIndexImpl extends JpsElementBase<JavaModuleIndexImpl> imp
     return copy;
   }
 
-  @Override
-  public void applyChanges(@NotNull JavaModuleIndexImpl modified) {
-    // not supported
-  }
-
   @Nullable
   @Override
   public File getModuleInfoFile(@NotNull JpsModule module, boolean forTests) {
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JpsJavaDependencyExtensionImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JpsJavaDependencyExtensionImpl.java
index d8d9b9b0a417..df36c5473558 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JpsJavaDependencyExtensionImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JpsJavaDependencyExtensionImpl.java
@@ -67,10 +67,4 @@ public class JpsJavaDependencyExtensionImpl extends JpsElementBase<JpsJavaDepend
   public JpsJavaDependencyExtensionImpl createCopy() {
     return new JpsJavaDependencyExtensionImpl(this);
   }
-
-  @Override
-  public void applyChanges(@NotNull JpsJavaDependencyExtensionImpl modified) {
-    setExported(modified.myExported);
-    setScope(modified.myScope);
-  }
 }
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JpsJavaModuleExtensionImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JpsJavaModuleExtensionImpl.java
index 2de0fb167380..5c1ae5ba9498 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JpsJavaModuleExtensionImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JpsJavaModuleExtensionImpl.java
@@ -89,15 +89,6 @@ public final class JpsJavaModuleExtensionImpl extends JpsCompositeElementBase<Jp
     }
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsJavaModuleExtensionImpl modified) {
-    setLanguageLevel(modified.myLanguageLevel);
-    setInheritOutput(modified.myInheritOutput);
-    setExcludeOutput(modified.myExcludeOutput);
-    setOutputUrl(modified.myOutputUrl);
-    setTestOutputUrl(modified.myTestOutputUrl);
-  }
-
   @Override
   public boolean isInheritOutput() {
     return myInheritOutput;
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JpsJavaProjectExtensionImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JpsJavaProjectExtensionImpl.java
index 0c0301579c1e..17f74ad5ead0 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JpsJavaProjectExtensionImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/java/impl/JpsJavaProjectExtensionImpl.java
@@ -2,12 +2,13 @@
 package org.jetbrains.jps.model.java.impl;
 
 import com.intellij.openapi.util.Comparing;
-import java.util.Objects;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jps.model.ex.JpsElementBase;
 import org.jetbrains.jps.model.java.JpsJavaProjectExtension;
 import org.jetbrains.jps.model.java.LanguageLevel;
 
+import java.util.Objects;
+
 public class JpsJavaProjectExtensionImpl extends JpsElementBase<JpsJavaProjectExtensionImpl> implements JpsJavaProjectExtension {
   private String myOutputUrl;
   private LanguageLevel myLanguageLevel;
@@ -51,10 +52,4 @@ public class JpsJavaProjectExtensionImpl extends JpsElementBase<JpsJavaProjectEx
       fireElementChanged();
     }
   }
-
-  @Override
-  public void applyChanges(@NotNull JpsJavaProjectExtensionImpl modified) {
-    setLanguageLevel(modified.myLanguageLevel);
-    setOutputUrl(modified.myOutputUrl);
-  }
 }
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/java/impl/runConfiguration/JpsApplicationRunConfigurationPropertiesImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/java/impl/runConfiguration/JpsApplicationRunConfigurationPropertiesImpl.java
index 9afe09513a64..dc9732ef52c6 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/java/impl/runConfiguration/JpsApplicationRunConfigurationPropertiesImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/java/impl/runConfiguration/JpsApplicationRunConfigurationPropertiesImpl.java
@@ -34,11 +34,6 @@ public class JpsApplicationRunConfigurationPropertiesImpl extends JpsElementBase
     return new JpsApplicationRunConfigurationPropertiesImpl(XmlSerializerUtil.createCopy(myState));
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsApplicationRunConfigurationPropertiesImpl modified) {
-    XmlSerializerUtil.copyBean(modified.myState, myState);
-  }
-
   @Override
   public String getMainClass() {
     return myState.MAIN_CLASS_NAME;
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/library/impl/JpsLibraryRootImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/library/impl/JpsLibraryRootImpl.java
index 47bad8242126..9ade51e7d0e4 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/library/impl/JpsLibraryRootImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/library/impl/JpsLibraryRootImpl.java
@@ -62,10 +62,6 @@ public final class JpsLibraryRootImpl extends JpsElementBase<JpsLibraryRootImpl>
     return new JpsLibraryRootImpl(this);
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsLibraryRootImpl modified) {
-  }
-
   @Override
   @NotNull
   public JpsLibrary getLibrary() {
diff --git a/jps/model-impl/src/org/jetbrains/jps/model/library/impl/sdk/JpsSdkImpl.java b/jps/model-impl/src/org/jetbrains/jps/model/library/impl/sdk/JpsSdkImpl.java
index 7fae53ab6c3f..3affb9d2c357 100644
--- a/jps/model-impl/src/org/jetbrains/jps/model/library/impl/sdk/JpsSdkImpl.java
+++ b/jps/model-impl/src/org/jetbrains/jps/model/library/impl/sdk/JpsSdkImpl.java
@@ -1,7 +1,6 @@
 // Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package org.jetbrains.jps.model.library.impl.sdk;
 
-import java.util.Objects;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.jps.model.JpsElement;
 import org.jetbrains.jps.model.JpsElementFactory;
@@ -11,6 +10,8 @@ import org.jetbrains.jps.model.library.sdk.JpsSdk;
 import org.jetbrains.jps.model.library.sdk.JpsSdkReference;
 import org.jetbrains.jps.model.library.sdk.JpsSdkType;
 
+import java.util.Objects;
+
 public class JpsSdkImpl<P extends JpsElement> extends JpsCompositeElementBase<JpsSdkImpl<P>> implements JpsSdk<P> {
   private final JpsSdkType<P> mySdkType;
   private String myHomePath;
@@ -58,13 +59,6 @@ public class JpsSdkImpl<P extends JpsElement> extends JpsCompositeElementBase<Jp
     return (JpsLibraryImpl<JpsSdk<P>>)super.getParent();
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsSdkImpl<P> modified) {
-    super.applyChanges(modified);
-    setHomePath(modified.getHomePath());
-    setVersionString(modified.getVersionString());
-  }
-
   @Override
   public String getHomePath() {
     return myHomePath;
diff --git a/jps/model-serialization/src/org/jetbrains/jps/model/serialization/impl/JpsModuleSerializationDataExtensionImpl.java b/jps/model-serialization/src/org/jetbrains/jps/model/serialization/impl/JpsModuleSerializationDataExtensionImpl.java
index 1327c09a65b3..70da15b4a25f 100644
--- a/jps/model-serialization/src/org/jetbrains/jps/model/serialization/impl/JpsModuleSerializationDataExtensionImpl.java
+++ b/jps/model-serialization/src/org/jetbrains/jps/model/serialization/impl/JpsModuleSerializationDataExtensionImpl.java
@@ -39,10 +39,6 @@ public class JpsModuleSerializationDataExtensionImpl extends JpsElementBase<JpsM
     return new JpsModuleSerializationDataExtensionImpl(myBaseDirectory);
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsModuleSerializationDataExtensionImpl modified) {
-  }
-
   @NotNull
   @Override
   public File getBaseDirectory() {
diff --git a/jps/model-serialization/src/org/jetbrains/jps/model/serialization/impl/JpsPathVariablesConfigurationImpl.java b/jps/model-serialization/src/org/jetbrains/jps/model/serialization/impl/JpsPathVariablesConfigurationImpl.java
index f670ee423b20..61a50dce9a74 100644
--- a/jps/model-serialization/src/org/jetbrains/jps/model/serialization/impl/JpsPathVariablesConfigurationImpl.java
+++ b/jps/model-serialization/src/org/jetbrains/jps/model/serialization/impl/JpsPathVariablesConfigurationImpl.java
@@ -41,10 +41,6 @@ public class JpsPathVariablesConfigurationImpl extends JpsElementBase<JpsPathVar
     return new JpsPathVariablesConfigurationImpl(myPathVariables);
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsPathVariablesConfigurationImpl modified) {
-  }
-
   @Override
   public void addPathVariable(@NotNull String name, @NotNull String value) {
     myPathVariables.put(name, value);
diff --git a/jps/model-serialization/src/org/jetbrains/jps/model/serialization/impl/JpsProjectSerializationDataExtensionImpl.java b/jps/model-serialization/src/org/jetbrains/jps/model/serialization/impl/JpsProjectSerializationDataExtensionImpl.java
index af5acd85959c..1019d6c19765 100644
--- a/jps/model-serialization/src/org/jetbrains/jps/model/serialization/impl/JpsProjectSerializationDataExtensionImpl.java
+++ b/jps/model-serialization/src/org/jetbrains/jps/model/serialization/impl/JpsProjectSerializationDataExtensionImpl.java
@@ -38,10 +38,6 @@ public class JpsProjectSerializationDataExtensionImpl extends JpsElementBase<Jps
     return new JpsProjectSerializationDataExtensionImpl(myBaseDirectory);
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsProjectSerializationDataExtensionImpl modified) {
-  }
-
   @NotNull
   @Override
   public File getBaseDirectory() {
diff --git a/platform/lang-impl/testSources/com/intellij/openapi/roots/TestCustomSourceRoot.kt b/platform/lang-impl/testSources/com/intellij/openapi/roots/TestCustomSourceRoot.kt
index a84137f68029..9aa644b03899 100644
--- a/platform/lang-impl/testSources/com/intellij/openapi/roots/TestCustomSourceRoot.kt
+++ b/platform/lang-impl/testSources/com/intellij/openapi/roots/TestCustomSourceRoot.kt
@@ -67,10 +67,6 @@ class TestCustomSourceRootProperties(initialTestString: String?) : JpsElementBas
   override fun createCopy(): TestCustomSourceRootProperties {
     return TestCustomSourceRootProperties(testString)
   }
-
-  override fun applyChanges(modified: TestCustomSourceRootProperties) {
-    testString = modified.testString
-  }
 }
 
 class TestCustomSourceRootPropertiesSerializer(
diff --git a/plugins/IntelliLang/intellilang-jps-plugin/src/org/jetbrains/jps/intellilang/model/impl/JpsIntelliLangConfigurationImpl.java b/plugins/IntelliLang/intellilang-jps-plugin/src/org/jetbrains/jps/intellilang/model/impl/JpsIntelliLangConfigurationImpl.java
index a9a0fe407e99..782d9e7fdbb0 100644
--- a/plugins/IntelliLang/intellilang-jps-plugin/src/org/jetbrains/jps/intellilang/model/impl/JpsIntelliLangConfigurationImpl.java
+++ b/plugins/IntelliLang/intellilang-jps-plugin/src/org/jetbrains/jps/intellilang/model/impl/JpsIntelliLangConfigurationImpl.java
@@ -23,12 +23,6 @@ public class JpsIntelliLangConfigurationImpl extends JpsElementBase<JpsIntelliLa
     return new JpsIntelliLangConfigurationImpl();
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsIntelliLangConfigurationImpl modified) {
-    myPatternAnnotationClassName = modified.myPatternAnnotationClassName;
-    myInstrumentationType = modified.myInstrumentationType;
-  }
-
   @NotNull
   @Override
   public String getPatternAnnotationClass() {
diff --git a/plugins/ant/jps-plugin/src/org/jetbrains/jps/ant/model/impl/JpsAntConfigurationImpl.java b/plugins/ant/jps-plugin/src/org/jetbrains/jps/ant/model/impl/JpsAntConfigurationImpl.java
index dc0391ea2f43..df0db1fec773 100644
--- a/plugins/ant/jps-plugin/src/org/jetbrains/jps/ant/model/impl/JpsAntConfigurationImpl.java
+++ b/plugins/ant/jps-plugin/src/org/jetbrains/jps/ant/model/impl/JpsAntConfigurationImpl.java
@@ -54,10 +54,6 @@ public final class JpsAntConfigurationImpl extends JpsElementBase<JpsAntConfigur
     return myProjectDefaultAntName;
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsAntConfigurationImpl modified) {
-  }
-
   @Override
   @NotNull
   public Collection<JpsAntBuildFileOptions> getOptionsForAllBuildFiles() {
diff --git a/plugins/ant/jps-plugin/src/org/jetbrains/jps/ant/model/impl/JpsAntInstallationImpl.java b/plugins/ant/jps-plugin/src/org/jetbrains/jps/ant/model/impl/JpsAntInstallationImpl.java
index aaa17a60df14..7ec46a6f03d5 100644
--- a/plugins/ant/jps-plugin/src/org/jetbrains/jps/ant/model/impl/JpsAntInstallationImpl.java
+++ b/plugins/ant/jps-plugin/src/org/jetbrains/jps/ant/model/impl/JpsAntInstallationImpl.java
@@ -52,10 +52,6 @@ public final class JpsAntInstallationImpl extends JpsElementBase<JpsAntInstallat
     return myName;
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsAntInstallationImpl modified) {
-  }
-
   @Override
   public File getAntHome() {
     return myAntHome;
diff --git a/plugins/gradle/jps-plugin/src/org/jetbrains/jps/gradle/model/impl/JpsGradleModuleExtensionImpl.java b/plugins/gradle/jps-plugin/src/org/jetbrains/jps/gradle/model/impl/JpsGradleModuleExtensionImpl.java
index f6daa97ac698..3dbfa826b5fd 100644
--- a/plugins/gradle/jps-plugin/src/org/jetbrains/jps/gradle/model/impl/JpsGradleModuleExtensionImpl.java
+++ b/plugins/gradle/jps-plugin/src/org/jetbrains/jps/gradle/model/impl/JpsGradleModuleExtensionImpl.java
@@ -45,8 +45,4 @@ public class JpsGradleModuleExtensionImpl extends JpsElementBase<JpsGradleModule
   public JpsGradleModuleExtensionImpl createCopy() {
     return new JpsGradleModuleExtensionImpl(myModuleType);
   }
-
-  @Override
-  public void applyChanges(@NotNull JpsGradleModuleExtensionImpl modified) {
-  }
 }
diff --git a/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/GreclipseJpsCompilerSettings.java b/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/GreclipseJpsCompilerSettings.java
index ddc0950c4c1f..a270bdd1ecd8 100644
--- a/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/GreclipseJpsCompilerSettings.java
+++ b/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/GreclipseJpsCompilerSettings.java
@@ -37,11 +37,6 @@ public class GreclipseJpsCompilerSettings extends JpsCompositeElementBase<Grecli
     return new GreclipseJpsCompilerSettings(mySettings);
   }
 
-  @Override
-  public void applyChanges(@NotNull GreclipseJpsCompilerSettings modified) {
-    mySettings = modified.mySettings;
-  }
-
   @Nullable
   public static GreclipseSettings getSettings(@NotNull JpsProject project) {
     GreclipseJpsCompilerSettings extension = project.getContainer().getChild(ROLE);
diff --git a/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/JpsGroovySettings.java b/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/JpsGroovySettings.java
index 232ed7bae40c..e167ddcb47ec 100644
--- a/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/JpsGroovySettings.java
+++ b/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/JpsGroovySettings.java
@@ -60,10 +60,6 @@ public class JpsGroovySettings extends JpsElementBase<JpsGroovySettings> {
     return new JpsGroovySettings(this);
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsGroovySettings modified) {
-  }
-
   @NotNull
   public static JpsGroovySettings getSettings(@NotNull JpsProject project) {
     JpsGroovySettings settings = project.getContainer().getChild(ROLE);
diff --git a/plugins/javaFX/javaFX-jps-plugin/src/org/jetbrains/plugins/javaFX/JpsJavaFxArtifactProperties.java b/plugins/javaFX/javaFX-jps-plugin/src/org/jetbrains/plugins/javaFX/JpsJavaFxArtifactProperties.java
index a3bd3af0e0a7..5be8b74886aa 100644
--- a/plugins/javaFX/javaFX-jps-plugin/src/org/jetbrains/plugins/javaFX/JpsJavaFxArtifactProperties.java
+++ b/plugins/javaFX/javaFX-jps-plugin/src/org/jetbrains/plugins/javaFX/JpsJavaFxArtifactProperties.java
@@ -52,11 +52,6 @@ public class JpsJavaFxArtifactProperties extends JpsElementBase<JpsJavaFxArtifac
     return new JpsJavaFxArtifactProperties(myState);
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsJavaFxArtifactProperties modified) {
-    copyState(modified.myState);
-  }
-
   public static class MyState {
     private String myTitle;
     private String myVendor;
diff --git a/plugins/javaFX/javaFX-jps-plugin/src/org/jetbrains/plugins/javaFX/jpackage/JPackageArtifactProperties.java b/plugins/javaFX/javaFX-jps-plugin/src/org/jetbrains/plugins/javaFX/jpackage/JPackageArtifactProperties.java
index 294a05530eeb..0f88f3381020 100644
--- a/plugins/javaFX/javaFX-jps-plugin/src/org/jetbrains/plugins/javaFX/jpackage/JPackageArtifactProperties.java
+++ b/plugins/javaFX/javaFX-jps-plugin/src/org/jetbrains/plugins/javaFX/jpackage/JPackageArtifactProperties.java
@@ -36,9 +36,4 @@ public class JPackageArtifactProperties extends JpsElementBase<JPackageArtifactP
   public @NotNull JPackageArtifactProperties createCopy() {
     return new JPackageArtifactProperties(this);
   }
-
-  @Override
-  public void applyChanges(@NotNull JPackageArtifactProperties modified) {
-    copyState(modified);
-  }
 }
\ No newline at end of file
diff --git a/plugins/javaFX/javaFX-jps-plugin/src/org/jetbrains/plugins/javaFX/preloader/JpsJavaFxPreloaderArtifactProperties.java b/plugins/javaFX/javaFX-jps-plugin/src/org/jetbrains/plugins/javaFX/preloader/JpsJavaFxPreloaderArtifactProperties.java
index 4605c2787fd7..3b845e2f24cc 100644
--- a/plugins/javaFX/javaFX-jps-plugin/src/org/jetbrains/plugins/javaFX/preloader/JpsJavaFxPreloaderArtifactProperties.java
+++ b/plugins/javaFX/javaFX-jps-plugin/src/org/jetbrains/plugins/javaFX/preloader/JpsJavaFxPreloaderArtifactProperties.java
@@ -38,11 +38,6 @@ public class JpsJavaFxPreloaderArtifactProperties extends JpsElementBase<JpsJava
     return new JpsJavaFxPreloaderArtifactProperties(myState);
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsJavaFxPreloaderArtifactProperties modified) {
-    copyState(modified.myState);
-  }
-
   public String getPreloaderClass() {
     return myState.getPreloaderClass();
   }
diff --git a/plugins/maven/jps-plugin/src/org/jetbrains/jps/maven/model/impl/JpsMavenModuleExtensionImpl.java b/plugins/maven/jps-plugin/src/org/jetbrains/jps/maven/model/impl/JpsMavenModuleExtensionImpl.java
index 4f6331bc2202..6b669e4ab7e4 100644
--- a/plugins/maven/jps-plugin/src/org/jetbrains/jps/maven/model/impl/JpsMavenModuleExtensionImpl.java
+++ b/plugins/maven/jps-plugin/src/org/jetbrains/jps/maven/model/impl/JpsMavenModuleExtensionImpl.java
@@ -26,8 +26,4 @@ public class JpsMavenModuleExtensionImpl extends JpsElementBase<JpsMavenModuleEx
     extension.myAnnotationProcessorModules.addAll(this.myAnnotationProcessorModules);
     return extension;
   }
-
-  @Override
-  public void applyChanges(@NotNull JpsMavenModuleExtensionImpl modified) {
-  }
 }
diff --git a/plugins/ui-designer/jps-plugin/src/org/jetbrains/jps/uiDesigner/model/impl/JpsUiDesignerConfigurationImpl.java b/plugins/ui-designer/jps-plugin/src/org/jetbrains/jps/uiDesigner/model/impl/JpsUiDesignerConfigurationImpl.java
index a12835b4c866..7736f0ac9aa8 100644
--- a/plugins/ui-designer/jps-plugin/src/org/jetbrains/jps/uiDesigner/model/impl/JpsUiDesignerConfigurationImpl.java
+++ b/plugins/ui-designer/jps-plugin/src/org/jetbrains/jps/uiDesigner/model/impl/JpsUiDesignerConfigurationImpl.java
@@ -65,13 +65,6 @@ public class JpsUiDesignerConfigurationImpl extends JpsElementBase<JpsUiDesigner
     return myState.USE_DYNAMIC_BUNDLES;
   }
 
-  @Override
-  public void applyChanges(@NotNull JpsUiDesignerConfigurationImpl modified) {
-    setCopyFormsRuntimeToOutput(modified.isCopyFormsRuntimeToOutput());
-    setInstrumentClasses(modified.isInstrumentClasses());
-    setUseDynamicBundles(modified.isUseDynamicBundles());
-  }
-
   public static class UiDesignerConfigurationState {
     public boolean INSTRUMENT_CLASSES = true;
     public boolean COPY_FORMS_RUNTIME_TO_OUTPUT = true;