[FIXED] Mockmcv query param with localdate MethodArgumentTypeMismatchException exception

Issue

I'm trying to write an integration test with mockmvc, but I'm getting an error. While startDate and endDate, which I receive as request param, normally work without any problems, I get the following error in the test; MethodArgumentTypeMismatchException

My controller

 @GetMapping("/")
    public ResponseEntity<List<TransactionDto>> getTransactionByDateRange(@RequestParam LocalDate startDate,
                                                                          @RequestParam  LocalDate endDate) {

        logger.info("Get transaction request received with date range, start date: {} and end date: {}",
                startDate,
                endDate);

        List<TransactionDto> transactionDtoList = transactionService.findTransactionByDateRange(startDate,endDate);

        if(transactionDtoList.isEmpty()){
            throw new TransactionListIsEmptyException("No transaction data can be found in this date range. " +
                    "Please check the date range you entered.");
        }

        return new ResponseEntity(Response.ok().setPayload(transactionDtoList), HttpStatus.OK);
    }

My Test

@Test
    public void testfindTransactionByDateRange_whenTransactionsAreExists_ShouldReturnTransactionDtoList() throws Exception {
        //given
        LocalDate startDate = LocalDate.of(2020,10,5);
        LocalDate endDate = LocalDate.now();

        Transaction transaction = transactionRepository.save(generateTransaction());
        Transaction transaction2 = transactionRepository.save(generateTransaction());
        Transaction transaction3 = transactionRepository.save(generateTransaction());
        transactionService.createTransaction(transaction);
        transactionService.createTransaction(transaction2);
        transactionService.createTransaction(transaction3);
        List<Transaction> transactionList = new ArrayList<>();
        transactionList.add(transaction);
        transactionList.add(transaction2);
        transactionList.add(transaction3);
        List<TransactionDto> expected = converter.convertList(transactionList);


        //when
        //then
        this.mockMvc.perform(get(TRANSACTION_API_ENDPOINT)
                        .queryParam("startDate","10.10.2015")
                        .queryParam("endDate","10.10.2015"))
                .andExpect(status().is2xxSuccessful())
                .andExpect(content().contentType(MediaType.APPLICATION_JSON));

    }

Solution

Edit: After searching a little bit, I found this thread which could be use as a solution for this topic:

How to use LocalDateTime RequestParam in Spring? I get "Failed to convert String to LocalDateTime"

Since the exact type of LocalDate parameter doesn't match with the one user sending in queryParam, the exceptions is being thrown. Adding @DateTimeFormat to the parameters in the controller with the expected type will solve the issue.

---

Can you try to give your startDate and endDate parameters with using LocalDate object creation? This is a very good guide that you can follow: ~

https://www.baeldung.com/java-creating-localdate-with-values

The error occurs due to giving string to that LocalDate fields probably.

Answered By - patrinox
Answer Checked By - Senaida (JavaFixing Volunteer)