diff --git a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchDetailServiceImpl.java b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchDetailServiceImpl.java
index 31747571d5..756cb161c3 100644
--- a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchDetailServiceImpl.java
+++ b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchDetailServiceImpl.java
@@ -20,6 +20,7 @@ import com.google.gerrit.common.data.PatchScript;
 import com.google.gerrit.common.data.ReviewResult;
 import com.google.gerrit.common.errors.NoSuchEntityException;
 import com.google.gerrit.httpd.rpc.BaseServiceImplementation;
+import com.google.gerrit.httpd.rpc.Handler;
 import com.google.gerrit.httpd.rpc.changedetail.ChangeDetailFactory;
 import com.google.gerrit.reviewdb.client.AccountDiffPreference;
 import com.google.gerrit.reviewdb.client.Change;
@@ -29,6 +30,7 @@ import com.google.gerrit.reviewdb.client.PatchSet;
 import com.google.gerrit.reviewdb.server.ReviewDb;
 import com.google.gerrit.server.CurrentUser;
 import com.google.gerrit.server.changedetail.DeleteDraftPatchSet;
+import com.google.gerrit.server.patch.PatchScriptFactory;
 import com.google.gerrit.server.patch.PatchSetInfoNotAvailableException;
 import com.google.gerrit.server.project.NoSuchChangeException;
 import com.google.gerrit.server.project.NoSuchProjectException;
@@ -72,7 +74,8 @@ class PatchDetailServiceImpl extends BaseServiceImplementation implements
       callback.onFailure(new NoSuchEntityException());
       return;
     }
-    patchScriptFactoryFactory.create(patchKey, psa, psb, dp).to(callback);
+    Handler.wrap(patchScriptFactoryFactory.create(patchKey, psa, psb, dp))
+      .to(callback);
   }
 
   public void saveDraft(final PatchLineComment comment,
diff --git a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchModule.java b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchModule.java
index d1f5b245ac..4e69b141a7 100644
--- a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchModule.java
+++ b/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchModule.java
@@ -28,11 +28,9 @@ public class PatchModule extends RpcServletModule {
     install(new FactoryModule() {
       @Override
       protected void configure() {
-        factory(PatchScriptFactory.Factory.class);
         factory(SaveDraft.Factory.class);
       }
     });
-    bind(PatchScriptBuilder.class);
     rpc(PatchDetailServiceImpl.class);
   }
 }
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/config/GerritGlobalModule.java b/gerrit-server/src/main/java/com/google/gerrit/server/config/GerritGlobalModule.java
index 62c6863743..a7574c9b9e 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/config/GerritGlobalModule.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/config/GerritGlobalModule.java
@@ -92,6 +92,7 @@ import com.google.gerrit.server.mail.RebasedPatchSetSender;
 import com.google.gerrit.server.mail.ReplacePatchSetSender;
 import com.google.gerrit.server.mail.VelocityRuntimeProvider;
 import com.google.gerrit.server.patch.PatchListCacheImpl;
+import com.google.gerrit.server.patch.PatchScriptFactory;
 import com.google.gerrit.server.patch.PatchSetInfoFactory;
 import com.google.gerrit.server.project.AccessControlModule;
 import com.google.gerrit.server.project.ChangeControl;
@@ -186,6 +187,7 @@ public class GerritGlobalModule extends FactoryModule {
     factory(MergedSender.Factory.class);
     factory(MergeFailSender.Factory.class);
     factory(MergeUtil.Factory.class);
+    factory(PatchScriptFactory.Factory.class);
     factory(PerformCreateGroup.Factory.class);
     factory(PerformRenameGroup.Factory.class);
     factory(PluginUser.Factory.class);
diff --git a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchScriptBuilder.java b/gerrit-server/src/main/java/com/google/gerrit/server/patch/PatchScriptBuilder.java
similarity index 98%
rename from gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchScriptBuilder.java
rename to gerrit-server/src/main/java/com/google/gerrit/server/patch/PatchScriptBuilder.java
index 5019403db0..eaa5e75998 100644
--- a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchScriptBuilder.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/patch/PatchScriptBuilder.java
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package com.google.gerrit.httpd.rpc.patch;
+package com.google.gerrit.server.patch;
 
 import com.google.gerrit.common.data.CommentDetail;
 import com.google.gerrit.common.data.PatchScript;
@@ -26,11 +26,6 @@ import com.google.gerrit.reviewdb.client.PatchLineComment;
 import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.reviewdb.client.AccountDiffPreference.Whitespace;
 import com.google.gerrit.server.FileTypeRegistry;
-import com.google.gerrit.server.patch.IntraLineDiff;
-import com.google.gerrit.server.patch.IntraLineDiffKey;
-import com.google.gerrit.server.patch.PatchListCache;
-import com.google.gerrit.server.patch.PatchListEntry;
-import com.google.gerrit.server.patch.Text;
 import com.google.inject.Inject;
 
 import eu.medsea.mimeutil.MimeType;
diff --git a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchScriptFactory.java b/gerrit-server/src/main/java/com/google/gerrit/server/patch/PatchScriptFactory.java
similarity index 96%
rename from gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchScriptFactory.java
rename to gerrit-server/src/main/java/com/google/gerrit/server/patch/PatchScriptFactory.java
index e0ec4654c1..e700f1450f 100644
--- a/gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/patch/PatchScriptFactory.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/patch/PatchScriptFactory.java
@@ -12,11 +12,10 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package com.google.gerrit.httpd.rpc.patch;
+package com.google.gerrit.server.patch;
 
 import com.google.gerrit.common.data.CommentDetail;
 import com.google.gerrit.common.data.PatchScript;
-import com.google.gerrit.httpd.rpc.Handler;
 import com.google.gerrit.reviewdb.client.Account;
 import com.google.gerrit.reviewdb.client.AccountDiffPreference;
 import com.google.gerrit.reviewdb.client.Change;
@@ -32,11 +31,6 @@ import com.google.gerrit.server.IdentifiedUser;
 import com.google.gerrit.server.account.AccountInfoCacheFactory;
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.git.LargeObjectException;
-import com.google.gerrit.server.patch.PatchList;
-import com.google.gerrit.server.patch.PatchListCache;
-import com.google.gerrit.server.patch.PatchListEntry;
-import com.google.gerrit.server.patch.PatchListKey;
-import com.google.gerrit.server.patch.PatchListNotAvailableException;
 import com.google.gerrit.server.project.ChangeControl;
 import com.google.gerrit.server.project.NoSuchChangeException;
 import com.google.gwtorm.server.OrmException;
@@ -55,12 +49,13 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.Callable;
 
 import javax.annotation.Nullable;
 
 
-class PatchScriptFactory extends Handler<PatchScript> {
-  interface Factory {
+public class PatchScriptFactory implements Callable<PatchScript> {
+  public interface Factory {
     PatchScriptFactory create(Patch.Key patchKey,
         @Assisted("patchSetA") PatchSet.Id patchSetA,
         @Assisted("patchSetB") PatchSet.Id patchSetB,