Multithread in Java

BookAgent.kt

class BookAgent(private val bookService: BookService) : Thread() {

    override fun run() {
        val uuid = UUID.randomUUID().toString()
        for (n in 0..10) {
            sleep(5000)
            bookService.save(
                    BookDataRequestModel(
                            name = "Book $uuid version: $n",
                            excerpt = "excerpt",
                            content = "content",
                            author = "author",
                            publisher = "publisher"
                    )
            )
        }
    }
}

BookDataController.kt

@RestController
@RequestMapping(value = ["/book"])
class BookDataController : BaseController() {

    @Autowired
    lateinit var bookService: BookService

    @PostMapping(value = ["thread"])
    @Transactional(rollbackFor = [Exception::class])
    fun addUsingThread(): ResponseEntity<ResultResponse> {
        BookAgent(bookService).start()
        return generateResponse(true).build()
    }
}