How to load @Cache on startup in spring?

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Just use the cache as before, add a scheduler to update cache, code snippet is below.

@Service
public class CacheScheduler {
    @Autowired
    BookDao bookDao;
    @Autowired
    CacheManager cacheManager;

    @PostConstruct
    public void init() {
        update();
        scheduleUpdateAsync();
    }

    public void update() {
        for (Book book : bookDao.findAll()) {
            cacheManager.getCache("books").put(book.getIsbn(), book);
        }
    }
}

Make sure your KeyGenerator will return the object for one parameter (as default). Or else, expose the putToCache method in BookService to avoid using cacheManager directly.

@CachePut(value = "books", key = "#book.isbn")
public Book putToCache(Book book) {
    return book;
}

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