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Cache busting not working

See original GitHub issue

Following https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-spring-mvc-static-content it should be enough to add

spring.resources.chain.enabled=true
spring.resources.chain.strategy.content.enabled=true
spring.resources.chain.strategy.content.paths=/**

to my application.properties in order to enable the cache busting / fingerprinting of my static assets.

Here’s an example thymeleaf doc head:

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="utf-8">
    <title th:text="#{page.title}"></title>
    <link th:href="@{/css/main.css}" rel="stylesheet" media="screen"/>
    <meta name="viewport" content="width=device-width, initial-scale=1">
</head>

However, the output is still /css/main.css without any version.

Spring Boot v2.2.6.RELEASE
id ‘org.springframework.boot’ version ‘2.2.6.RELEASE’ id ‘io.spring.dependency-management’ version ‘1.0.9.RELEASE’
implementation ‘org.springframework.boot:spring-boot-starter-thymeleaf’

Also running in the IDEA / running the build jar makes no difference.

Issue Analytics

State:
Created 3 years ago
Comments:6 (3 by maintainers)

Top GitHub Comments

1reaction

black-snowcommented, May 6, 2020

@ultraq kudos to you for you efforts - I was finally able to nail the issue down to lazy-initialization.

Once I spring.main.lazy-initialization=true cache-busting is gone. This seems like a bug to me for the docs say that bean stuff is delayed until an actual HTTP request hits the bean. But it has nothing to do with thymeleaf. I’ll open an issue in spring.

Thanks!

1reaction

ultraqcommented, Apr 29, 2020

I was able to get it working by taking the example app downloadable from https://spring.io/guides/gs/serving-web-content/, matching the versions of the dependencies you listed, then adding an application.properties file with the config values in your post, adding <link rel="stylesheet" th:href="@{/css/test.css}"/> to the greeting.html file, and adding an empty CSS file in the src/main/resources/static/css directory. Result:

<!DOCTYPE HTML>
<html>
<head> 
    <title>Getting Started: Serving Web Content</title> 
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <link rel="stylesheet" href="/css/test-d41d8cd98f00b204e9800998ecf8427e.css"/>
</head>
<body>
    <p >Hello, World!</p>
</body>
</html>

One thing I noticed: if there was no file at the target path (like after I got it working I deleted test.css), then Spring Boot couldn’t fingerprint my file and I’d get the plain /css/test.css in the HTML from the server. So it might be good to double check paths to resources are correct as that seems to be a requirement for getting it working too.

But the fingerprinting is definitely working with Thymeleaf, so if there are more configuration issues then it might be worth asking over on the Spring Boot GitHub or on StackOverflow with the spring-boot tag.