Thymeleaf template not processed by Spring

Question

I'm trying to use Thymeleaf with Spring, using spring-boot. When I access a URL mapped to a controller that I expect to result in a Thymeleaf template being used, I just get a blank page in the browser.

I'm using autoconfiguration, with the following results (snipped from http://localhost:8080/autoconfig):

{
    "positiveMatches":{
        "ThymeleafAutoConfiguration":[
            {
                "condition":"OnClassCondition",
                "message":"@ConditionalOnClass classes found: org.thymeleaf.spring4.SpringTemplateEngine"
            }
        ],
        "ThymeleafAutoConfiguration.DefaultTemplateResolverConfiguration":[
            {
                "condition":"OnBeanCondition",
                "message":"@ConditionalOnMissingBean (names: defaultTemplateResolver; SearchStrategy: all) found no beans"
            }
        ],
        "ThymeleafAutoConfiguration.ThymeleafDefaultConfiguration":[
            {
                "condition":"OnBeanCondition",
                "message":"@ConditionalOnMissingBean (types: org.thymeleaf.spring4.SpringTemplateEngine; SearchStrategy: all) found no beans"
            }
        ],
        "ThymeleafAutoConfiguration.ThymeleafViewResolverConfiguration":[
            {
                "condition":"OnClassCondition",
                "message":"@ConditionalOnClass classes found: javax.servlet.Servlet"
            },
            {
                "condition":"OnWebApplicationCondition",
                "message":"found web application StandardServletEnvironment"
            }
        ],
        "ThymeleafAutoConfiguration.ThymeleafViewResolverConfiguration#thymeleafViewResolver":[
            {
                "condition":"OnBeanCondition",
                "message":"@ConditionalOnMissingBean (names: thymeleafViewResolver; SearchStrategy: all) found no beans"
            },
            {
                "condition":"OnPropertyCondition",
                "message":"matched"
            }
        ],
        "ThymeleafAutoConfiguration.ThymeleafWebLayoutConfiguration":[
            {
                "condition":"OnClassCondition",
                "message":"@ConditionalOnClass classes found: nz.net.ultraq.thymeleaf.LayoutDialect"
            }
        ],
    },
    "negativeMatches":{
        "ThymeleafAutoConfiguration.DataAttributeDialectConfiguration":[
            {
                "condition":"OnClassCondition",
                "message":"required @ConditionalOnClass classes not found: com.github.mxab.thymeleaf.extras.dataattribute.dialect.DataAttributeDialect"
            }
        ],
        "ThymeleafAutoConfiguration.ThymeleafConditionalCommentsDialectConfiguration":[
            {
                "condition":"OnClassCondition",
                "message":"required @ConditionalOnClass classes not found: org.thymeleaf.extras.conditionalcomments.dialect.ConditionalCommentsDialect"
            }
        ],
        "ThymeleafAutoConfiguration.ThymeleafSecurityDialectConfiguration":[
            {
                "condition":"OnClassCondition",
                "message":"required @ConditionalOnClass classes not found: org.thymeleaf.extras.springsecurity3.dialect.SpringSecurityDialect"
            }
        ],
    }
}

I have absolutely no application configuration - everything at this stages depends on autoconfig.

My controller (only one so far) looks like this:

@RestController
@RequestMapping("/")
public class MainController {

    @RequestMapping(value = "main.html", method = RequestMethod.GET)
    public void index( Model model ) {
        model.addAttribute( "name", "Gorgonzola" );
    }
}

I have the following project layout:

src/
    main/
        java/
            attendance/
                MainController.java
        resources/
            templates/
                main.html

and templates/main.html contains:

<!DOCTYPE html SYSTEM "http://www.thymeleaf.org/dtd/xhtml1-strict-thymeleaf-4.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:th="http://www.thymeleaf.org">

    <head>
        <title>Attendance</title>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    </head>

    <body>

        <p th:text="'Hello, ' + ${name} + '!'" />

    </body>

</html>

http://localhost:8080/mappings includes this:

"{[/main.html],methods=[GET],params=[],headers=[],consumes=[],produces=[],custom=[]}": {
    "bean": "requestMappingHandlerMapping",
    "method": "public void attendance.MainController.index(org.springframework.ui.Model)"
},

I'm using the Gradle spring-boot plugin and running the application with the Gradle bootRun task.

I tried adding --debug to the bootRun parameters, and when I point my browser at http://localhost:8080/main.html, I get this:

2015-02-19 17:36:14.754 DEBUG 9168 --- [tp1565713391-18] o.s.b.a.e.mvc.EndpointHandlerMapping     : Looking up handler method for path /main.html
2015-02-19 17:36:14.756 DEBUG 9168 --- [tp1565713391-18] o.s.b.a.e.mvc.EndpointHandlerMapping     : Did not find handler method for [/main.html]

... so I suspect I'm missing one simple parameter. But what is it?

Can anyone see why my template is not being processed? Or suggest further diagnostic steps I can take?

Andy McKibbin · Accepted Answer · 2015-02-19 08:13:40Z

1

I managed to make this work. There were a few things wrong with it:

the @RestController annotation, which I'd added accidentally, should of course read @Controller
the DOCTYPE specification in main.html appears to be incompatible with the Thymeleaf dialect that's autoconfigured - it needs to just read <!DOCTYPE html>
I took hrrgttnchml's suggestion about returning the bare name of the template to use

So now it works. Sorry for answering my own question, but after several hours of fiddling with this there's a certain amount of closure.

answered Feb 19, 2015 at 8:13

Andy McKibbin

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Comments

daniel.eichten · Accepted Answer · 2015-02-19 06:24:28Z

0

Your Controller doesn't define which view to render. Per default the ViewResolver doesn't do that based on your RequestMapping. Just make your main method to return a String and add a return statement like return "main"; and everything should work.

answered Feb 19, 2015 at 6:24

daniel.eichten

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1 Comment

Andy McKibbin Over a year ago

I tried that (in fact, that was my original implementation). I just get a webpage containing the string "main" (and no other content). In the log, I have: 2015-02-19 19:42:01.563 DEBUG 8832 --- [tp1565713391-16] o.s.b.a.e.mvc.EndpointHandlerMapping : Looking up handler method for path /main.html 2015-02-19 19:42:01.566 DEBUG 8832 --- [tp1565713391-16] o.s.b.a.e.mvc.EndpointHandlerMapping : Did not find handler method for [/main.html]

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