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javaspring-bootthymeleafjakarta-mail

Thymeleaf TemplateEngine unable to process templates on remote server

I am attempting to send emails using Thymeleaf from a SpringBoot application. Templates are processed locally using the following method:

public String build(MailType mailType, Map<String, Object> messageMap) {

    Context context = new Context();

    context.setVariables(messageMap);
    return templateEngine.process("/mail/" + mailType.name(), context);

}

MailType is an Enum with the names of each template stored, for example NEWUSER. Mail templates are stored in src/main/resources/templates/mail/

This sends an email as intended when running locally, but when running on the server, I receive the following error message:

org.thymeleaf.exceptions.TemplateInputException: Error resolving template [/mail/NEWUSER], template might not exist or might not be accessible by any of the configured Template Resolvers

Does anyone have any ideas about this? Any help would be greatly appreciated!

Solution

  • Hard-coding the plain text /mail/ was the problem. Used a TemplateResolver and this fixed the issue.

    context.setVariables(messageMap);

    TemplateEngine templateEngine = new TemplateEngine();

    ClassLoaderTemplateResolver templateResolver = new ClassLoaderTemplateResolver();
    templateResolver.setPrefix("templates/mail/");
    templateResolver.setSuffix(".html");
    templateResolver.setTemplateMode(TemplateMode.HTML);
    templateResolver.setCharacterEncoding("UTF-8");
    templateResolver.setOrder(0);

    templateEngine.setTemplateResolver(templateResolver);

    (May not be best practice, any better ideas?)