SpringTemplateEngine.process doesn't read file (thymeleaf)

Question

I'm trying to use a Thymeleaf template engine to create an html email, by following this tutorial.

I've created the template configuration:

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.nio.charset.StandardCharsets;
import org.thymeleaf.spring5.SpringTemplateEngine;
import org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver;
import org.thymeleaf.templatemode.TemplateMode;


@Configuration
public class ThymeleafTemplateConfiguration {
  @Bean
  public SpringTemplateEngine springTemplateEngine() {
    SpringTemplateEngine templateEngine = new SpringTemplateEngine();
    templateEngine.addTemplateResolver(htmlTemplateResolver());
    return templateEngine;
  }

  @Bean
  public SpringResourceTemplateResolver htmlTemplateResolver(){
    SpringResourceTemplateResolver templateResolver = new SpringResourceTemplateResolver();
    templateResolver.setPrefix("/templates/");
    templateResolver.setSuffix(".html");
    templateResolver.setTemplateMode(TemplateMode.HTML);
    templateResolver.setCharacterEncoding(StandardCharsets.UTF_8.name());
    return templateResolver;
  }
}

and an html template:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
  <p>This is the body to be changed</p>
  <p>This is a name: ${name}</p>
</body>
</html>

Then I try to populate the template:

templateEngine = new SpringTemplateEngine();
Context context = new Context();
context.setVariable("name", "my name");

String html = templateEngine.process("index", context);
System.out.println(html);

But rather than getting the populated template, I'm just getting the first parameter I put into process:

>>> my name

What am I doing wrong? why does process take the parameter as-is rather than reading the file with the specified prefix and suffix? (/templates/index.html)

can you post the full directory structure of your project? – oak Dec 25 '17 at 08:28 — oak, Dec 25 '17 at 08:28

score 1 · Accepted Answer · answered Dec 25 '17 at 08:31

1

Note that in the example you mention a bean called SpringTemplateEngine is being created and the SpringResourceTemplateResolver is being injected into it.

Your code does not make any use of the created bean. Instead it creates an new instance of SpringTemplateEngine. My guess, this new instance does not know SpringResourceTemplateResolver.

Two possible fixes

Autowired the bean instead of creating new instance
Create this instance the same way you create the bean, i.e addTemplateResolver to the new instance

answered Dec 25 '17 at 08:31

oak

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You're right, I Autowired it and now it does read the template file. It still doesn't replace ${name} with the name variable from the context though – shayelk Dec 25 '17 at 09:18
@shayelk it may be helpful to print all the known vars to the template. For doing that check out https://stackoverflow.com/questions/31387526/list-all-available-model-attributes-in-thymeleaf – oak Dec 25 '17 at 09:32
1

The problem was actually the inline mechanism. it turns out you should use [[${name}]] rather than ${name} as per Thymeleaf doc: http://www.thymeleaf.org/doc/articles/thymeleaf3migration.html – shayelk Dec 25 '17 at 12:00

SpringTemplateEngine.process doesn't read file (thymeleaf)

1 Answers1