Thymeleaf how to use model atrribute correctly its throwing null error

Question

public class Customer {
@Id
@GeneratedValue
private Integer id;

private String email;

private Long Apprvamount;

@JsonIgnore
@OneToMany(mappedBy="customer", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
private Set<MyTransaction> transactions;

@Transient
private Long rewardPoints;
public Long getRewardPoints() {
    function to calculate rewardPoints;
}

Contoller adding model attribute

@GetMapping("/customers/{id}")
public String getCustomer(@PathVariable Integer id,Model model) throws RecordNotFoundException {
    Customer customer = rewardsService.getCustomerById(id);
    model.addAttribute("customer", customer);
    return "profile";
}

Thymeleaf

<body>
   <div class="card-body">
        <h2 th:text="${customer.getEmail()}"></h2>
        <p th:text="${customer.getApprvamount()}"></p>
        <p th:text="${customer.getRewardPoints()}"></p>
        <p class="my-5">
            <a href="/{id}(id=${customer.getId()})/emi" class="btn btn-primary">
                <i> All</i></a>
        </p>

Its sometime throwing null error for getRewardPoints its working for email and approvamount.And url is not getting calculated.Getters and setters are present.What is wrong with the approach?

what exactly are you trying to put on `href`. How it should be ? — want2learn, Aug 07 '20 at 15:59

score 1 · Answer 1 · answered Aug 07 '20 at 16:00

1

You may have misspelt customer:

model.addAttribute("costumer", customer);

answered Aug 07 '20 at 16:00

Tom Spencer

34
1
4

Thanks now the email part is working but url and rewardPoints is not working – ankit dubey Aug 07 '20 at 18:07
In your description, you still have spelled "custumer" instead of "customer". – Slava Ivanov Aug 07 '20 at 20:07
1

Url is complete disaster. Please refer to Thymeleaf reference for Link URLs. It should looks similar to: `All` – Slava Ivanov Aug 07 '20 at 20:15
Thank you very much.It was the syntax error like you mentioned.Now url is working.But still rewardPoints is throwing error .What is the right approach? – ankit dubey Aug 08 '20 at 05:15
1

The `rewardPoints` is Long and may be it set to `null`. In this case you would need something like this: [Using Thymeleaf when the value is null](https://stackoverflow.com/questions/20636456/using-thymeleaf-when-the-value-is-null) – Slava Ivanov Aug 08 '20 at 16:40

Thymeleaf how to use model atrribute correctly its throwing null error

1 Answers1