/**
 * Copyright (C) 2015 Red Hat, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.fabric8.kubernetes.client.internal;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import io.fabric8.kubernetes.api.model.ObjectMeta;
import io.fabric8.kubernetes.client.internal.patchmixins.BuildMixIn;
import io.fabric8.kubernetes.client.internal.patchmixins.ObjectMetaMixIn;
import io.fabric8.openshift.api.model.Build;

public class PatchUtils {

  private static ObjectMapper patchMapper;

  public static ObjectMapper patchMapper() {
    if (patchMapper == null) {
      patchMapper = new ObjectMapper();
      patchMapper.addMixInAnnotations(ObjectMeta.class, ObjectMetaMixIn.class);
      patchMapper.addMixInAnnotations(Build.class, BuildMixIn.class);
      patchMapper.setConfig(patchMapper().getSerializationConfig().without(SerializationFeature.WRITE_EMPTY_JSON_ARRAYS));
    }
    return patchMapper;
  }


}

@@ -1025,17 +1025,16 @@
 Utils %7B%0A
-%0A
   privat
@@ -1046,35 +1046,34 @@
 tic 
-ObjectMapper patchMapper;%0A%0A
+class SingletonHolder %7B%0A  
   pu
@@ -1084,16 +1084,22 @@
  static 
+final 
 ObjectMa
@@ -1118,41 +1118,21 @@
 pper
-() %7B
+;%0A
 %0A    
-if (patchMapper == null)
+static
  %7B%0A 
@@ -1196,27 +1196,16 @@
 addMixIn
-Annotations
 (ObjectM
@@ -1269,19 +1269,8 @@
 ixIn
-Annotations
 (Bui
@@ -1337,18 +1337,16 @@
 chMapper
-()
 .getSeri
@@ -1431,17 +1431,83 @@
 %7D%0A  
-  return 
+%7D%0A%0A  public static ObjectMapper patchMapper() %7B%0A    return SingletonHolder.
 patc
@@ -1519,12 +1519,10 @@
 er;%0A  %7D%0A
-%0A%0A
 %7D%0A

Make PatchUtils thread safe