How to Load templates from external folder using Thymeleaf

Question

I'm working with spring boot and thymeleaf to generate Documents from html templates.

As the templates continuously changes, i want ti to load templates from an external just to add or remove templates from there instead of redeploy the application.

As a POC, when using /resources folder works fine.

This is the error:

Error resolving template "voucher", the template might not exist or might not be accessible by any of the configured Template Resolvers

This is the context:

applycation.yml

spring:
  thymeleaf:
    prefix: file:///${PARAMETERS_DIRECTORY_TEMPLATES:/home/app/templates/}
    check-template-location: true
    suffix=: .html
    mode: HTML
    encoding: UTF-8

This is my Method: Where templateName is the template filename and parameters is just a map who has the values to be replaced by the engine.

 @Override
public String buildHtmlFromTemplate(String templateName, Map<String, String> parameters) {
    TemplateEngine templateEngine = new TemplateEngine();
    FileTemplateResolver templateResolver = new FileTemplateResolver ();
    templateResolver.setOrder(templateEngine.getTemplateResolvers().size());
    templateResolver.setCacheable(false);
    templateResolver.setCheckExistence(true);

    templateEngine.setTemplateResolver(templateResolver);

    return templateEngine.process(templateName, this.resolveHtmlTemplateAttributesContext(parameters));
}

NOTE: I removed tha applycation yml thymeleaf configs and implemented next code but the error persists.

@Override
public String buildHtmlFromTemplate(String templateName, Map<String, String> parameters) {
    TemplateEngine templateEngine = new TemplateEngine();
    FileTemplateResolver templateResolver = new FileTemplateResolver ();
    templateResolver.setPrefix("/home/skeeter/templates/");
    templateResolver.setSuffix(".html");
    templateResolver.setTemplateMode("HTML");
    templateResolver.setOrder(templateEngine.getTemplateResolvers().size());
    templateResolver.setCharacterEncoding("UTF-8");
    templateResolver.setCacheable(false);
    templateResolver.setCheckExistence(true);

    templateEngine.setTemplateResolver(templateResolver);

    return templateEngine.process(templateName, this.resolveHtmlTemplateAttributesContext(parameters));
}

Thanks @SounakSaha i had read this article. I think that i'm using the right resolver but can't understan what i'm missing. — Martin Larizzate
– Martin Larizzate, Commented Aug 10, 2020 at 15:05
When setting the prefix in Java code for a FileTemplateResolver, you use a simple file path - for example, /path/to/templatesDir/ - without the URL-style use of file://. I don't know if the syntax is different just because you are using Spring's application.yml. Try commenting out the prefix line in the config file, and adding templateResolver.setPrefix("/path/to/templatesDir/"); in your Java code, as a test. — andrewJames
– andrewJames, Commented Aug 10, 2020 at 17:46
@andrewjames i tried moving all configs to the code but the error persists — Martin Larizzate
– Martin Larizzate, Commented Aug 10, 2020 at 22:24

Fran Jimenez · Accepted Answer · 2022-02-23 22:36:43Z

3

In my case I was using the ClassLoaderTemplateResolver, but after I changed it to FileTemplateResolver I can use the absolute path and it works fine.

Double check that you have read permissions in the directory where you have the templates.

answered Feb 23, 2022 at 22:36

Fran Jimenez

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General Grievance · Accepted Answer · 2023-05-02 13:58:00Z

3

Curiously, the issue was solved using this code and the /usr/app/templates created with sudo. I think it was only a permissions issue

.....
@Value("${parameters.directory.templates}")
private String templatesDirectory;  
.....    


@Override
public String buildHtmlFromTemplate(String templateName, Map<String, String> parameters) {
    TemplateEngine templateEngine = new TemplateEngine();
    FileTemplateResolver templateResolver = new FileTemplateResolver ();
    templateResolver.setPrefix(templatesDirectory);
    templateResolver.setSuffix(".html");
    templateResolver.setTemplateMode("HTML");
    templateResolver.setOrder(templateEngine.getTemplateResolvers().size());
    templateResolver.setCharacterEncoding("UTF-8");
    templateResolver.setCacheable(false);
    templateResolver.setCheckExistence(true);

    templateEngine.setTemplateResolver(templateResolver);

    return templateEngine.process(templateName, this.resolveHtmlTemplateAttributesContext(parameters));
}

edited May 2, 2023 at 13:58

General Grievance

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answered Aug 11, 2020 at 12:19

Martin Larizzate

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2 Comments

ihappyk Over a year ago

i am still facing this issue

Martin Larizzate Over a year ago

Give us more info please.

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