add jade engine example (#2365)

* add jade engine example

* formatting

spring-mvc-simple/src/main/java/com/baeldung/spring/configuration/JadeTemplateConfiguration.java

@@ -0,0 +1,39 @@
+package com.baeldung.spring.configuration;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.ViewResolver;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+
+import de.neuland.jade4j.JadeConfiguration;
+import de.neuland.jade4j.spring.template.SpringTemplateLoader;
+import de.neuland.jade4j.spring.view.JadeViewResolver;
+
+@Configuration
+@EnableWebMvc
+@ComponentScan(basePackages = { "com.baeldung.springmvcforms", "com.baeldung.spring.controller", "com.baeldung.spring.validator" })
+public class JadeTemplateConfiguration {
+    @Bean
+    public SpringTemplateLoader templateLoader() {
+            SpringTemplateLoader templateLoader = new SpringTemplateLoader();
+            templateLoader.setBasePath("/WEB-INF/views/");
+            templateLoader.setSuffix(".jade");
+            return templateLoader;
+    }
+
+    @Bean
+    public JadeConfiguration jadeConfiguration() {
+            JadeConfiguration configuration = new JadeConfiguration();
+            configuration.setCaching(false);
+            configuration.setTemplateLoader(templateLoader());
+            return configuration;
+    }
+
+    @Bean
+    public ViewResolver viewResolver() {
+            JadeViewResolver viewResolver = new JadeViewResolver();
+            viewResolver.setConfiguration(jadeConfiguration());
+            return viewResolver;
+    }
+}

spring-mvc-simple/src/main/java/com/baeldung/spring/configuration/WebInitializer.java

@@ -18,6 +18,7 @@ public class WebInitializer implements WebApplicationInitializer {
 		//ctx.register(ThymeleafConfiguration.class);
 		//ctx.register(FreemarkerConfiguration.class);
 		//ctx.register(GroovyConfiguration.class);
+		//ctx.register(JadeTemplateConfiguration.class);
 		ctx.setServletContext(container);
 
 		// Manage the lifecycle of the root application context

spring-mvc-simple/src/main/java/com/baeldung/spring/controller/UserController.java

@@ -35,6 +35,12 @@ public class UserController {
         return "registration-groovy";
     }
     
+    @GetMapping("/registration-jade")
+    public String getRegistrationJade(Model model) {
+        model.addAttribute("user", new User());
+        return "registration-jade";
+    }
+    
     @PostMapping("/register")
     @ResponseBody
     public void register(User user){