How to map Page<ObjectEntity> to Page<ObjectDTO> in spring-data-rest

JavaSpringSpring MvcSpring DataSpring Data-Rest

Java Problem Overview

When I hit the database with PagingAndSortingRepository.findAll(Pageable) I get Page<ObjectEntity>. However, I want to expose DTO's to the client and not entities. I can create DTO just by injecting entity into it's constructor, but how do I map the entities in Page object to DTO's? According to spring documentation, Page provides read-only operations.

Also, is not possibility, as we don't have support for java 8. How to create the new Page with mapped objects manually?

Java Solutions

Solution 1 - Java

You can still use the without lambda expressions:

Page<ObjectEntity> entities = objectEntityRepository.findAll(pageable);
Page<ObjectDto> dtoPage = Converter<ObjectEntity, ObjectDto>() {
    public ObjectDto convert(ObjectEntity entity) {
        ObjectDto dto = new ObjectDto();
        // Conversion logic

        return dto;

Solution 2 - Java

In Spring Data 2, the Page map method takes a Function instead of a Converter, but it still works basically the same as @Ali Dehghani described.

Using Function:

Page<ObjectEntity> entities = objectEntityRepository.findAll(pageable);
Page<ObjectDto> dtoPage = Function<ObjectEntity, ObjectDto>() {
    public ObjectDto apply(ObjectEntity entity) {
        ObjectDto dto = new ObjectDto();
        // Conversion logic

        return dto;

Solution 3 - Java

And in java8:

Page<ObjectDto> entities = 

Where fromEntity is a static method on ObjectDto that contains the conversion logic.

Solution 4 - Java

You can use by simply doing this:

public Page<ObjectDto> toPageObjectDto(Page<Object> objects) {
	Page<ObjectDto> dtos  =;
	return dtos;

private ObjectDto convertToObjectDto(Object o) {
	ObjectDto dto = new ObjectDto();
	//conversion here
	return dto;

Solution 5 - Java

Here is my solution, thanks to @Ali Dehghani

private Page<ObjectDTO> mapEntityPageIntoDTOPage(Page<ObjectEntity> objectEntityPage) {
		return Converter<ObjectEntity, ObjectDTO>() {
			public ObjectDTO convert(ObjectEntity objectEntity) {
				return new ObjectDTO(objectEntity, httpSession);

Solution 6 - Java

I am created and using solution with model mapper, generics and lambdas for common usage.

 * Maps the Page {@code entities} of <code>T</code> type which have to be mapped as input to {@code dtoClass} Page
 * of mapped object with <code>D</code> type.
 * @param <D> - type of objects in result page
 * @param <T> - type of entity in <code>entityPage</code>
 * @param entities - page of entities that needs to be mapped
 * @param dtoClass - class of result page element
 * @return page - mapped page with objects of type <code>D</code>.
 * @NB <code>dtoClass</code> must has NoArgsConstructor!
public <D, T> Page<D> mapEntityPageIntoDtoPage(Page<T> entities, Class<D> dtoClass) {
    return ->, dtoClass));

This is exactly the case which you need (and I think common case for wide range of other cases).

You already have the data obtained from repository (same is with service) on this way:

Page<ObjectEntity> entities = objectEntityRepository.findAll(pageable);

Everything what you need for conversion is to call this method on this way:

Page<ObjectDto> dtoPage = mapEntityPageIntoDtoPage(entities, ObjectDto.class);

@Tip: You can use this method from util class, and it can be reused for all entity/dto in Page conversions on services and controllers according to your architecture.


Page<ObjectDto> dtoPage = mapperUtil.mapEntityPageIntoDtoPage(entities, ObjectDto.class);

Solution 7 - Java

use lambda expression is more convenient

Page<ObjectDto> dto=objectRepository.findAll(pageable).map((object -> DozerBeanMapperBuilder.buildDefault().map(object, ObjectDto.class)));

Solution 8 - Java

This works correctly in Spring 2.0 -

public Page<BookDto> getBooksByAuthor(String authorId, Pageable pageable) {
		Page<BookEntity> bookEntity = iBookRepository.findByAuthorId(authorId, pageable);
		return Function<BookEntity, BookDto>() {

			public BookDto apply(BookEntity t) {
				return new ModelMapper().map(t, BookDto.class);

The converter is no longer supported in Page type for Spring 2.0. Also, the Function should be used from java.util.function.Function.

Solution 9 - Java

Using Java 8 Lambda ,It worked for me. The answer is already given above,I am just simplifying.

Page<EmployeeEntity> employeeEntityPage = employeeService.findEmployeeEntities();

Page<EmployeeDto> employeeDtoPage = -> {
        EmployeeDto dto = employeeService.employeEntityToDto(entity);
        return dto;

Here employeeEntityToDto() is a method to convert Entities to Dtos

public EmployeeDto employeeEntityToDto(EmployeeEntity entity){
    EmployeeDto employeeDto =  new EmployeeDto();
    return employeeDto;

Solution 10 - Java

Page<Order> persistedOrderPage =;

Page<OrderDTO> orderPage = -> {
    OrderDTO order = mapper.toOrderDTO(persistedOrder);
    // do another action
    return order;

Solution 11 - Java

At the end, you will not return the Page to the users, but a list of ObjectDTO, with the Page details at the header, so this would be my solution.


public Page<ObjectEntity> findAll (Pageable pageable){
  //logic goes here.
  Page<ObjectEntity> page = objectRepository.findAll(pageable);
  return page;

ObjectResource / rest (the exposed endpoint)

public ResponseEntity<List<ObjectDTO>> findAll (Pageable pageable){
  Page<ObjectEntity> page = objectServiceService.findAll(pageable);

  HttpHeaders headers = PaginationUtil.generatePaginationHttpHeaders(page, "your-endpoint-here");

  return new ResponseEntity<>(objectMapper.toDto(page.getContent()), headers, HttpStatus.OK);

The reason for using this is so that you don't need to duplicate the page details for ObjectEntity and DTO. It is key to note that a page contains the following:

  • page number
  • pageSize
  • numberOfElements
  • content

The content is the list of objects returned, and is the only thing that needs to be mapped to DTO.


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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionTuomas ToivonenView Question on Stackoverflow
Solution 1 - JavaAli DehghaniView Answer on Stackoverflow
Solution 2 - JavaJayLView Answer on Stackoverflow
Solution 3 - JavaMustafaView Answer on Stackoverflow
Solution 4 - JavaIlias MentzView Answer on Stackoverflow
Solution 5 - JavaTuomas ToivonenView Answer on Stackoverflow
Solution 6 - JavaBosko MijinView Answer on Stackoverflow
Solution 7 - JavaEvol RofView Answer on Stackoverflow
Solution 8 - JavaBiswajit DuttaView Answer on Stackoverflow
Solution 9 - JavaVikash KumarView Answer on Stackoverflow
Solution 10 - JavaOguzhan CevikView Answer on Stackoverflow
Solution 11 - JavaPeter MutisyaView Answer on Stackoverflow