How to get List from Page in Spring Data REST

The simplest way to fetch all your results at once is to use Pageable.unpaged(), like below:

Page<Employee> allEmployees = employeeRepository.findAll(Pageable.unpaged());
allEmployees.getContent();

But if you are concerned about retrieving too much data at once and instead prefer to do the retrieval in small chunks, you can use a service or repository method similar to below:

private List<Employee> findAll() {
    List<Employee> allEmployees = new ArrayList<>();

    // First page of employees -- 5000 results per page
    PageRequest pageRequest = PageRequest.of(0, 5000);
    Page<Employee> employeePage = employeeRepository.findAll(pageRequest);
    allEmployees.addAll(employeePage.getContent());

    // All the remaining employees
    while (employeePage.hasNext()) {
        Page<Employee> nextPageOfEmployees = employeeRepository.findAll(employeePage.nextPageable());
        allEmployees.addAll(nextPageOfEmployees.getContent());

        // update the page reference to the current page
        employeePage = nextPageOfEmployees;
    }

    return allEmployees;
}

Check this page for advantages and disadvantages on fetching the data in chunks.

I know I am late, but, this is the first option it pops in google and people may need more answers when all the information of all pages needs to be converted into a list...

One aproximation can be:

xRepository.findAll(new PageRequest(0, Integer.MAX_VALUE)).getContent();

The problem here is that spring sets the maximum size to 1000 so you are going to get a list of maximum 1000 elements.

An other way of doing it can be multiple find with diferent page indexes and then adding the results into a list with getContent():

Page<T> pageData = xRepository.findAll(new PageRequest(0, 20));
List<T> finalList = pageData.getContent();
while(!pageData.isLast()){
    pageData = xRepository.findAll(pageData.nextPageable());
    List<T> listData = pageData.getContent();
    //append listData into finalList
}

If you use pageable in a jpa repository method, spring will always return a Page not a List. I suggest you have a service method that calls the repository method and extracts the contents of the Page result into a list.

So if your repository method is thus:

import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface RecordRepository extends JpaRepository<Record, Integer>{                      
     Page<Record> findAll(Pageable pageable);
}

then you can have a service class which has a method that calls the repository method

@Service
public class RecordService{

   @Autowired
   RecordRepository recordRepository;

  public List<Record> findAll(PageRequest pageRequest){
    Page<Record> recordsPage = recordRepository.findAll(pageRequest);
    return recordsPage.getContent();
  }
}

so in your calling class instead of calling the repository directly you can just use the service. thus:

public class MyRecordImpl{
   @Autowired
  RecordService recordService;

  public void doSomething(){
      int page = 0; int pageSize = 5;
      List<Record> recordList = recordService.findAll(new PageRequest(page, pageSize, new Sort(Sort.Direction.DESC, "recordId")));
     //do other implementations here
   }
}