Spring mvc thymeleaf with kotlin

file.java

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>7.0</version>
            <scope>provided</scope><!--provided by the container-->
        </dependency>
        <dependency>
            <groupId>org.jetbrains.kotlin</groupId>
            <artifactId>kotlin-stdlib</artifactId>
            <version>${kotlin.version}</version>
        </dependency>
        <dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf-spring4</artifactId>
            <version>2.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>nz.net.ultraq.thymeleaf</groupId>
            <artifactId>thymeleaf-layout-dialect</artifactId>
            <version>1.2.9</version>
        </dependency>
        <dependency>
            <groupId>com.github.mxab.thymeleaf.extras</groupId>
            <artifactId>thymeleaf-extras-data-attribute</artifactId>
            <version>1.3</version>
        </dependency>
    </dependencies>




@Configuration
@EnableWebMvc
@ComponentScan("com.lynas")
open class WebConfig {
    @Bean
    open fun templateResolver(): ServletContextTemplateResolver {
        val resolver = ServletContextTemplateResolver()
        resolver.prefix = "/"
        resolver.suffix = ".html"
        resolver.templateMode = "HTML5"
        resolver.isCacheable = false // make it true before release
        return resolver
    }


    @Bean
    open fun templateEngine(): SpringTemplateEngine {
        val dialects = HashSet<IDialect>()
        dialects.add(LayoutDialect())

        val engine = SpringTemplateEngine()
        engine.setTemplateResolver(templateResolver())
        engine.setAdditionalDialects(dialects)
        engine.addDialect(DataAttributeDialect())
        return engine
    }

    @Bean
    open fun viewResolver(): ThymeleafViewResolver {
        val resolver = ThymeleafViewResolver()
        resolver.templateEngine = templateEngine()
        resolver.order = 1
        resolver.viewNames = arrayOf("*", "js/*", "template/*")
        return resolver
    }


}