How to retrieve data from connected table with connected ID - spring

Question

I have tables like this:
User:
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#NotEmpty
#Size(min = 3, max = 20)
private String username;
... more fields, not important
Wallet:
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#NotEmpty(message = "Please, insert a wallet name")
private String walletName;
private double initialBalance;
#ManyToOne(fetch = FetchType.LAZY, optional = false)
#JoinColumn(name = "user_id", nullable = false)
#OnDelete(action = OnDeleteAction.CASCADE)
#JsonIgnore
private User user;
As you can see those two tables are connected, and I can assignee wallet to user.
Now, I created a userProfile HTML page and want to display next stuff: Username, email, initalBalance.
I managed somehow to get principals from logged user:
<h1>Username </h1>
<h1 th:text="${#authentication.getPrincipal().getUsername()}"></h1>
<br>
<h1>Email </h1>
<h1 th:text="${#authentication.getPrincipal().getEmail()}"></h1>
But I have problem to show initialBalance of his wallet.
When I try with walletRepository.findAll() obviously that return initialBalances from all users.
This is how I tried so far:
#GetMapping("/userWallet/{user_id}/balance")
public String getUserWallet(#PathVariable(value = "user_id") Long user_id, Model model, Wallet wallet) {
model.addAttribute("wallet", walletRepository.findByUserIdAndInitialBalance(user_id, wallet.getInitialBalance()));
return "userProfile";
}
And in HTML:
<tr th:each="wallets:${wallet}">
<div class="title">
<h1>Balance </h1>
<h1 th:text="${wallets.initialBalance}"></h1>
</div>
But nothing is printed at screen.
So just to be clear, I want to provide a initialBalance from user wallet.