Thymeleaf: th:text only if not null?

Question

I have something like below, which of course works if user had previously input his wrong credentials.

However if I directly go to my login fail url /login?error for example without any previous incorrect logins, session[SPRING_SECURITY_LAST_EXCEPTION] is of course null and I get a nasty 404.

<span th:text="${session[SPRING_SECURITY_LAST_EXCEPTION].message}">Invalid credentials</span>

Question:

Is there a processor for something like below (which is too long to write and read most of the time), or should I just roll my own?

<span th:text="${session[SPRING_SECURITY_LAST_EXCEPTION] != null ? session[SPRING_SECURITY_LAST_EXCEPTION].message : #messages.msg('AbstractUserDetailsAuthenticationProvider.badCredentials')}"> Invalid credentials </span>

Aeseir · Accepted Answer · 2015-07-22 01:24:43Z

3

You can use the th:if statement:

<span th:if="${session[SPRING_SECURITY_LAST_EXCEPTION].message}" th:text="${session[SPRING_SECURITY_LAST_EXCEPTION].message}">Invalid credentials</span>

That will only display this line if there is a value present.

EDIT 1:

Extra check:

<span th:if="${session[SPRING_SECURITY_LAST_EXCEPTION] != null and session[SPRING_SECURITY_LAST_EXCEPTION].message != null}" th:text="${session[SPRING_SECURITY_LAST_EXCEPTION].message}">Invalid credentials</span>

edited Jul 22, 2015 at 1:24

answered Jul 21, 2015 at 5:24

Aeseir

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4 Comments

Rey Libutan Over a year ago

if session[SPRING_SECURITY_LAST_EXCEPTION] is null, it will throw a n NPE on .message

Aeseir Over a year ago

Not the case, if it is null then if statement is FALSE therefore th:text doesn't get rendered.

Rey Libutan Over a year ago

This is what you wrote th:if="${session[SPRING_SECURITY_LAST_EXCEPTION].message}"

Aeseir Over a year ago

I've edited the answer to add another layer of tests just in case it doesn't work for you (which it did for me for a similar thing).

Sarvar Nishonboyev · Accepted Answer · 2018-01-29 08:44:40Z

3

Try this code, it is more optimal:

${session['SPRING_SECURITY_LAST_EXCEPTION']?.message}

? - checks if the resource is not null

answered Jan 29, 2018 at 8:44

Sarvar Nishonboyev

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1 Comment

Woodchuck Over a year ago

This works and is nicely succinct! Is it documented anywhere? I don't see it in thymeleaf's docs.

anishroniyar · Accepted Answer · 2015-07-21 08:34:30Z

Try this:

<span th:if="${session[SPRING_SECURITY_LAST_EXCEPTION].message != null}"> <span th:text="${session[SPRING_SECURITY_LAST_EXCEPTION].message}">Invalid credentials</span> </span>

scopchanov · Accepted Answer · 2018-10-16 20:22:01Z

In your controller set the null string variable as

String nullvalue=""; model.addAttribute("nullvalue",nullvalue); model.addAttribute("entity",entity);

then in your view class as in thymeleaf

<td data-th-if="${entity.field != nullvalue}">ok</td>

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