import jakarta.persistence.Id; import jakarta.persistence.Table; import jakarta.ws.rs.QueryParam; import lombok.Data; import lombok.extern.log4j.Log4j2; @Log4j2 @Service @RestController("/store/book") public class BookStoreController { private final BooksRepository repo; public BookStoreController(BooksRepository repo, Boolean bool, Collection keys) { this.repo = repo; if (bool) { // check first key String firstKey = (String) ((ArrayList) keys).get(0); if (firstKey == "public") { keys.stream().forEach(key -> { // ... some logic log.warn("Using key " + key); }); } } } @PutMapping("/create") public Book create(Map<String, Object> map) throws Exception { System.out.println("Check if book exists " + map); }