Spring Boot - multiple template location

Question

I want Spring look for templates in different locations, not only in src/main/resource/templates/.

Here what I have

@Configuration
public class WebConfig{

    @Autowired
    private SpringTemplateEngine templateEngine;

    @PostConstruct
    public void clientTemplate(){
        SpringResourceTemplateResolver resolver = new SpringResourceTemplateResolver();
        resolver.setPrefix("static/client");
        resolver.setSuffix(".html");
        resolver.setTemplateMode("HTML5");
        resolver.setOrder(templateEngine.getTemplateResolvers().size());
        resolver.setCacheable(false);
        templateEngine.addTemplateResolver(resolver);
    }
}

But when I try to access a existing template index.html in /src/main/resources/static/client, I've got:

java.lang.IllegalArgumentException: ApplicationContext has not been initialized in resource resolver. TemplateResolver or ResourceResolver might not have been correctly configured by the Spring Application Context.
at org.thymeleaf.util.Validate.notNull(Validate.java:37)
at org.thymeleaf.spring4.resourceresolver.SpringResourceResourceResolver.getResourceAsStream(SpringResourceResourceResolver.java:81)
at org.thymeleaf.TemplateRepository.getTemplate(TemplateRepository.java:221)
at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1104)
at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1060)
at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1011)
at org.thymeleaf.spring4.view.ThymeleafView.renderFragment(ThymeleafView.java:335)
at org.thymeleaf.spring4.view.ThymeleafView.render(ThymeleafView.java:190)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1257)
at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1037)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:980)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)

How to resolve this problem?

Answer 1

1. Non-Spring managed SpringResourceTemplateResolver

With your current setup, you are creating an instance of SpringResourceTemplateResolver, NOT in a @Bean method. Thus, it doesn't get picked up by spring and you need to provide the ApplicationContext (example):

SpringResourceTemplateResolver resolver = new SpringResourceTemplateResolver();
resolver.setApplicationContext(applicationContext);
resolver.setPrefix("/WEB-INF/templates/");
resolver.setTemplateMode(TemplateMode.HTML);

Notice the resolver.setApplicationContext(applicationContext);

---

2. Spring managed SpringResourceTemplateResolver

You are probably seeing examples which don't need do that, but they are most certainly creating the SpringResourceTemplateResolver instance in a @Bean method. Spring picks it up and sets the application context for you (example):

@Bean
public ITemplateResolver templateResolver() {
    SpringResourceTemplateResolver resolver = new SpringResourceTemplateResolver();
    resolver.setPrefix("/WEB-INF/templates/");
    resolver.setSuffix(".html");
    resolver.setTemplateMode(TemplateMode.HTML);
    resolver.setCacheable(false);
    return resolver;
}