Custom Exception thrown in Java should be shown in Thymeleaf

Question

Custom Exception thrown in Java should be shown in Thymeleaf

1.6k Views Asked by Bernd At 22 December 2018 at 20:09

I want to show my custom exception that is being thrown in Java code in Thymeleaf.

@Override
public UserDetails loadUserByUsername(String benutzername) throws UsernameNotFoundException {
    Benutzer benutzer = userRepository.findByBenutzername(benutzername);
    if (benutzer == null || ! benutzer.isActive()) {
        throw new UsernameNotFoundException("Wrong username or password was provided!");
    }

<div th:if="${param.error}" >
    <div class="alert alert-danger">
        Here should my custom exception appear from above.
    </div>
</div>

I throw a new UsernameNotFoundException with a custom exception and this exception should be shown in my template, however, I do not know how this should be done.

Original Q&A

There are 1 best solutions below

**Alien** · Accepted Answer · 2018-12-22T21:17:21.470000

Define the property in application.properties to enable the stacktrace to be included as expression attribute in Thymeleaf view.

server.error.include-stacktrace=always

and then create an error page named error.html like below.

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:th="http://www.thymeleaf.org">
<head>
    <style>
table td{
vertical-align:top;
border:solid 1px #888;
padding:10px;
}

    </style>
</head>
<body>
<h1>My Thymeleaf Error Page</h1>
<table>
    <tr>
        <td>Date</td>
        <td th:text="${timestamp}"/>
    </tr>
    <tr>
        <td>Path</td>
        <td th:text="${path}"/>
    </tr>
    <tr>
        <td>Error</td>
        <td th:text="${error}"/>
    </tr>
    <tr>
        <td>Status</td>
        <td th:text="${status}"/>
    </tr>
    <tr>
        <td>Message</td>
        <td th:text="${message}"/>
    </tr>
    <tr>
        <td>Exception</td>
        <td th:text="${exception}"/>
    </tr>
    <tr>
        <td>Trace</td>
        <td>
            <pre th:text="${trace}"/>
        </td>
    </tr>
</table>
</body>
</html>

Refer this for full example.

Custom Exception thrown in Java should be shown in Thymeleaf

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