html - Thymeleaf: concatenate expressions

Question

I have this expression

<h2 class="topmargin_0 bottommargin_30" th:text="${user.name} || ${user.age} || ' years old'"></h2>

butn when I run the app. I have this error:

Could not parse as expression: 

Answer 1

To concatenate, use +:

<h2 th:text="${user.name} + ${user.age} + 'years old'" ...>

Or use |:

<h2 th:text="|${user.name} ${user.age} years old|" ...>

UPDATE: I wrote a blog post to show all possible string concatentation options in depth.