Program: 38649
Project: 38649
Buggy source:
private static void addArrayPath(JsonElement parentElement,ArrayPath childPath,List<TuplePath> tailPaths,ValueType type,String value){
  Optional<String> childName=childPath.getName();
  Optional<Integer> childIndex=childPath.getListIndex();
  Optional<Integer> childSize=childPath.getListSize();
  Preconditions.checkState(childIndex.isPresent());
  Preconditions.checkState(childSize.isPresent());
  if (childName.isPresent()) {
    String name=childName.get();
    Preconditions.checkState(parentElement.isJsonObject());
    JsonObject parentObject=parentElement.getAsJsonObject();
    final JsonArray childArray;
    if (!parentObject.has(name)) {
      childArray=new JsonArray();
      parentObject.add(name,childArray);
    }
 else {
      childArray=parentObject.get(name).getAsJsonArray();
    }
    if (!tailPaths.isEmpty()) {
      addChildPathToParentArray(childArray,childIndex.get(),tailPaths,type,value);
    }
 else {
      Preconditions.checkState(childArray.size() == childIndex.get());
      if (type != ValueType.JSON_EMPTY) {
        childArray.add(getJsonElement(type,value));
      }
    }
  }
 else {
    Preconditions.checkState(parentElement.isJsonArray());
    JsonArray parentArray=parentElement.getAsJsonArray();
    if (!tailPaths.isEmpty()) {
      addChildPathToParentArray(parentArray,childIndex.get(),tailPaths,type,value);
    }
 else {
      Preconditions.checkState(parentArray.size() == childIndex.get());
      if (type != ValueType.JSON_EMPTY) {
        parentArray.add(getJsonElement(type,value));
      }
    }
  }
}

Fixed version (ground truth):
private static void addArrayPath(JsonElement parentElement,ArrayPath childPath,List<TuplePath> tailPaths,ValueType type,String value){
  Optional<String> childName=childPath.getName();
  Optional<Integer> childIndex=childPath.getListIndex();
  Optional<Integer> childSize=childPath.getListSize();
  Preconditions.checkState(childIndex.isPresent());
  Preconditions.checkState(childSize.isPresent());
  if (childName.isPresent()) {
    String name=childName.get();
    Preconditions.checkState(parentElement.isJsonObject());
    JsonObject parentObject=parentElement.getAsJsonObject();
    final JsonArray childArray;
    if (!parentObject.has(name)) {
      childArray=new JsonArray();
      parentObject.add(name,childArray);
    }
 else {
      childArray=parentObject.get(name).getAsJsonArray();
    }
    if (!tailPaths.isEmpty()) {
      addChildPathToParentArray(childArray,childIndex.get(),tailPaths,type,value);
    }
 else {
      Preconditions.checkState(childArray.size() == childIndex.get());
      if (type != ValueType.JSON_EMPTY) {
        childArray.add(getJsonElement(type,value));
      }
 else       if (childSize.get() > 0) {
        childArray.add(new JsonObject());
      }
    }
  }
 else {
    Preconditions.checkState(parentElement.isJsonArray());
    JsonArray parentArray=parentElement.getAsJsonArray();
    if (!tailPaths.isEmpty()) {
      addChildPathToParentArray(parentArray,childIndex.get(),tailPaths,type,value);
    }
 else {
      Preconditions.checkState(parentArray.size() == childIndex.get());
      if (type != ValueType.JSON_EMPTY) {
        parentArray.add(getJsonElement(type,value));
      }
    }
  }
}