Conversion of List to Page in Spring

Question

I am trying to convert list to page in spring. I have converted it using

new PageImpl(users, pageable, users.size());

But now I having problem with sorting and pagination itself. When I try passing size and page, the pagination doesn't work.

Here's the code I am using.

My Controller

    public ResponseEntity<User> getUsersByProgramId(         @RequestParam(name = "programId", required = true) Integer programId Pageable pageable) {      List<User> users = userService.findAllByProgramId(programId);     Page<User> pages = new PageImpl<User>(users, pageable, users.size());      return new ResponseEntity<>(pages, HttpStatus.OK); } 

Here is my user Repo

public interface UserRepo extends JpaRepository<User, Integer>{  public List<User> findAllByProgramId(Integer programId); 

Here is my service

    public List<User> findAllByProgramId(Integer programId); 

Answer 1

I had the same problem. I used subList:

final int start = (int)pageable.getOffset(); final int end = Math.min((start + pageable.getPageSize()), users.size()); final Page<User> page = new PageImpl<>(users.subList(start, end), pageable, users.size()); 

Answer 2

There is a Page implementation for that:

Page<Something> page = new PageImpl<>(yourList);