diff --git a/java/com/google/gerrit/extensions/api/changes/RevisionApi.java b/java/com/google/gerrit/extensions/api/changes/RevisionApi.java
index 02ccb31..14dc589 100644
--- a/java/com/google/gerrit/extensions/api/changes/RevisionApi.java
+++ b/java/com/google/gerrit/extensions/api/changes/RevisionApi.java
@@ -35,7 +35,9 @@
 
 public interface RevisionApi {
   @Deprecated
-  void delete() throws RestApiException;
+  default void delete() throws RestApiException {
+    throw new UnsupportedOperationException("draft workflow is discontinued");
+  }
 
   String description() throws RestApiException;
 
@@ -43,22 +45,32 @@
 
   ReviewResult review(ReviewInput in) throws RestApiException;
 
-  void submit() throws RestApiException;
+  default void submit() throws RestApiException {
+    SubmitInput in = new SubmitInput();
+    submit(in);
+  }
 
   void submit(SubmitInput in) throws RestApiException;
 
-  BinaryResult submitPreview() throws RestApiException;
+  default BinaryResult submitPreview() throws RestApiException {
+    return submitPreview("zip");
+  }
 
   BinaryResult submitPreview(String format) throws RestApiException;
 
   @Deprecated
-  void publish() throws RestApiException;
+  default void publish() throws RestApiException {
+    throw new UnsupportedOperationException("draft workflow is discontinued");
+  }
 
   ChangeApi cherryPick(CherryPickInput in) throws RestApiException;
 
   CherryPickChangeInfo cherryPickAsInfo(CherryPickInput in) throws RestApiException;
 
-  ChangeApi rebase() throws RestApiException;
+  default ChangeApi rebase() throws RestApiException {
+    RebaseInput in = new RebaseInput();
+    return rebase(in);
+  }
 
   ChangeApi rebase(RebaseInput in) throws RestApiException;
 
@@ -70,7 +82,9 @@
 
   Set<String> reviewed() throws RestApiException;
 
-  Map<String, FileInfo> files() throws RestApiException;
+  default Map<String, FileInfo> files() throws RestApiException {
+    return files(null);
+  }
 
   Map<String, FileInfo> files(@Nullable String base) throws RestApiException;
 
@@ -166,33 +180,16 @@
    * interface.
    */
   class NotImplemented implements RevisionApi {
-    @Deprecated
-    @Override
-    public void delete() throws RestApiException {
-      throw new NotImplementedException();
-    }
-
     @Override
     public ReviewResult review(ReviewInput in) throws RestApiException {
       throw new NotImplementedException();
     }
 
     @Override
-    public void submit() throws RestApiException {
-      throw new NotImplementedException();
-    }
-
-    @Override
     public void submit(SubmitInput in) throws RestApiException {
       throw new NotImplementedException();
     }
 
-    @Deprecated
-    @Override
-    public void publish() throws RestApiException {
-      throw new NotImplementedException();
-    }
-
     @Override
     public ChangeApi cherryPick(CherryPickInput in) throws RestApiException {
       throw new NotImplementedException();
@@ -204,11 +201,6 @@
     }
 
     @Override
-    public ChangeApi rebase() throws RestApiException {
-      throw new NotImplementedException();
-    }
-
-    @Override
     public ChangeApi rebase(RebaseInput in) throws RestApiException {
       throw new NotImplementedException();
     }
@@ -254,11 +246,6 @@
     }
 
     @Override
-    public Map<String, FileInfo> files() throws RestApiException {
-      throw new NotImplementedException();
-    }
-
-    @Override
     public List<String> queryFiles(String query) throws RestApiException {
       throw new NotImplementedException();
     }
@@ -349,11 +336,6 @@
     }
 
     @Override
-    public BinaryResult submitPreview() throws RestApiException {
-      throw new NotImplementedException();
-    }
-
-    @Override
     public BinaryResult submitPreview(String format) throws RestApiException {
       throw new NotImplementedException();
     }
diff --git a/java/com/google/gerrit/server/api/changes/RevisionApiImpl.java b/java/com/google/gerrit/server/api/changes/RevisionApiImpl.java
index 6952f55..f8a2ecb 100644
--- a/java/com/google/gerrit/server/api/changes/RevisionApiImpl.java
+++ b/java/com/google/gerrit/server/api/changes/RevisionApiImpl.java
@@ -228,12 +228,6 @@
   }
 
   @Override
-  public void submit() throws RestApiException {
-    SubmitInput in = new SubmitInput();
-    submit(in);
-  }
-
-  @Override
   public void submit(SubmitInput in) throws RestApiException {
     try {
       submit.apply(revision, in);
@@ -243,11 +237,6 @@
   }
 
   @Override
-  public BinaryResult submitPreview() throws RestApiException {
-    return submitPreview("zip");
-  }
-
-  @Override
   public BinaryResult submitPreview(String format) throws RestApiException {
     try {
       submitPreview.setFormat(format);
@@ -258,22 +247,6 @@
   }
 
   @Override
-  public void publish() throws RestApiException {
-    throw new UnsupportedOperationException("draft workflow is discontinued");
-  }
-
-  @Override
-  public void delete() throws RestApiException {
-    throw new UnsupportedOperationException("draft workflow is discontinued");
-  }
-
-  @Override
-  public ChangeApi rebase() throws RestApiException {
-    RebaseInput in = new RebaseInput();
-    return rebase(in);
-  }
-
-  @Override
   public ChangeApi rebase(RebaseInput in) throws RestApiException {
     try {
       return changes.id(rebase.apply(revision, in)._number);
@@ -365,11 +338,6 @@
     }
   }
 
-  @Override
-  public Map<String, FileInfo> files() throws RestApiException {
-    return files(null);
-  }
-
   @SuppressWarnings("unchecked")
   @Override
   public Map<String, FileInfo> files(@Nullable String base) throws RestApiException {