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0Day Forums Coding FrameWork Spring Spring boot + thymeleaf in IntelliJ: cannot resolve vars

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Spring boot + thymeleaf in IntelliJ: cannot resolve vars

Offline autopathy545714


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#11
08-02-2023, 04:15 PM
I had the same problem and fixed it (ultimate 2021.3.2).
Intellij has a hard time guessing the type of the attribute(s).

Keep **www** in the namespace xmlns:th="http://www.thymeleaf.org" otherwise Intellij won't parse thymeleaf tags

If you initialize one model in a controler,

- don't use a method's return, declare a variable

String titre=post.getTitle();
model.addAttribute("title",titre);

- don't add attributes through sub methods, keep it in the main block

@GetMapping("/book")
public String ver(Model model) {
...
model.addAttribute("title", title);
return "frontpage";
}

- and don't use complex operator like the ternary one

model.addAttribute("titles", titles.size() > 0 ? titles : null);

If you initialize 2 or 3 models in you controler,
don't push null values

model.addAttribute("employees", null);
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Offline monotremal149844


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#12
08-02-2023, 04:32 PM
I was resolve like following
click **Alt + Enter**

Lets try it!!!

[![enter image description here][1]][1]


[1]:
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Offline corinthianesque432319


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#13
08-02-2023, 04:34 PM
# Update

**TL;DR:** skip to accepted answer below:

[To see links please register here]


As mentioned in the comments by multiple people, this solution is not correct. The Thymeleaf documentation (see

[To see links please register here]

), have in all their examples a version with `www.` included:

```html
<html xmlns:th="http://www.thymeleaf.org">
```

See also the [Standard-Dialect.xml](

[To see links please register here]

) on Github, which declares `namespace-uri` as:

```xml
namespace-uri="http://www.thymeleaf.org"
```

# Original Answer

I had two different portions of code: the first was showing the error and the second was not doing it.
I observed that there is a difference in the **xmlns:th** attribute.

**First Page: Not working!**

<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:th="http://www.thymeleaf.org">


**Second Page: Working!**

<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:th="http://thymeleaf.org">


I removed the **www.** and it works for me!
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Offline TruongTieuPham21


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#14
08-02-2023, 04:34 PM
# Prerequisites

* Thymeleaf plugin is installed
* The `html` element has an XML namespace declaration for `th` that is set to `http://www.thymeleaf.org` (with `www.`), for example:

```
<html xmlns:th="http://www.thymeleaf.org">
```

# IntelliJ version >= 2017.3

Detection should work automatically. However, some people complain that it still does not work for them), the issue [IDEA-132738][2] should be fixed (@FloatOverflow: "I confirm that in version 2017.3 build 25.Oct.2017 the problem has been solved"):

> Status 2017.3
>
> Support for Spring Boot autoconfigured MVC applications is complete, all bundled autoconfiguration view types are supported.
>
> Fix versions: 2017.3

If variables are not automatically detected you can still add the `@thymesVar` annotation as shown below.

# IntelliJ version < 2017.3

It is, as [Andrew wrote][1], a known error [IDEA-132738][2]. There is a workaround how to get rid of the error marks in the IDE. IntelliJ also supports the semi-automatic generation of the below mentioned code:

> You can use <kbd>Alt</kbd>+<kbd>Enter</kbd> shortcut to invoke intention "Declare external variable in comment annotation" in order to get rid of "unresolved model attribute" in your views.

Add the following code to your `html` file:

<!--/* Workaround for bug

[To see links please register here]

-->
<!--@thymesVar id="post" type="your.package.Post"-->
<!--@thymesVar id="title" type="String"-->
<!--@thymesVar id="content" type="String"-->
<!--*/-->

If you use extensions objects constructed automatically by ThymeLeaf, such as `#temporals` from `thymeleaf-extras-java8time` for conversion of `java.time` objects:

<span th:text="${#temporals.format(person.birthDate,'yyyy-MM-dd')}"></span>

and IntelliJ cannot resolve them, use similar code, and just add `#` in front of the object name:

<!--@thymesVar id="#temporals" type="org.thymeleaf.extras.java8time.expression.Temporals"-->


[1]:

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[2]:

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Offline tabularydqlnr


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#15
08-02-2023, 04:34 PM
In spring boot + thymeleaf, after adding a custom bean, everything worked. Hope it helps someone!



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