cleanup (default impl)

platform/projectModel-api/src/com/intellij/openapi/roots/libraries/LibraryTable.java

@@ -83,10 +83,17 @@ public interface LibraryTable {
     boolean isChanged();
   }
 
-  interface Listener extends EventListener{
-    void afterLibraryAdded (Library newLibrary);
-    void afterLibraryRenamed (Library library);
-    void beforeLibraryRemoved (Library library);
-    void afterLibraryRemoved (Library library);
+  interface Listener extends EventListener {
+    default void afterLibraryAdded(Library newLibrary) {
+    }
+
+    default void afterLibraryRenamed(Library library) {
+    }
+
+    default void beforeLibraryRemoved(Library library) {
+    }
+
+    default void afterLibraryRemoved(Library library) {
+    }
   }
 }

platform/projectModel-impl/src/com/intellij/openapi/roots/impl/LibraryOrderEntryImpl.java

@@ -30,8 +30,8 @@ import org.jdom.Element;
 import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
-import org.jetbrains.jps.model.serialization.module.JpsModuleRootModelSerializer;
 import org.jetbrains.jps.model.serialization.java.JpsJavaModelSerializerExtension;
+import org.jetbrains.jps.model.serialization.module.JpsModuleRootModelSerializer;
 
 /**
  *  @author dsl
@@ -278,9 +278,5 @@ class LibraryOrderEntryImpl extends LibraryOrderEntryBaseImpl implements Library
     public void beforeLibraryRemoved(Library library) {
       LibraryOrderEntryImpl.this.beforeLibraryRemoved(library);
     }
-
-    @Override
-    public void afterLibraryRemoved(Library library) {
-    }
   }
 }

platform/projectModel-impl/src/com/intellij/openapi/roots/impl/libraries/LibraryTableBase.java

@@ -321,24 +321,11 @@ public abstract class LibraryTableBase implements PersistentStateComponent<Eleme
       myLibraryByNameCache = null;
     }
 
-    @Override
-    public void afterLibraryAdded(Library newLibrary) {
-    }
-
     @Override
     public void afterLibraryRenamed(Library library) {
       myLibraryByNameCache = null;
     }
 
-    @Override
-    public void beforeLibraryRemoved(Library library) {
-    }
-
-    @Override
-    public void afterLibraryRemoved(Library library) {
-
-    }
-
     @Override
     public void writeExternal(Element element) throws WriteExternalException {
       final List<Library> libraries = ContainerUtil.findAll(myLibraries, library -> !((LibraryEx)library).isDisposed());