try to fix template resolvers

src/main/java/ru/ulstu/configuration/MailTemplateConfiguration.java

@@ -1,21 +1,33 @@
 package ru.ulstu.configuration;
 
+import nz.net.ultraq.thymeleaf.LayoutDialect;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.thymeleaf.extras.springsecurity4.dialect.SpringSecurityDialect;
+import org.thymeleaf.spring4.SpringTemplateEngine;
 import org.thymeleaf.templateresolver.ClassLoaderTemplateResolver;
+import org.thymeleaf.templateresolver.ITemplateResolver;
 
 import java.nio.charset.StandardCharsets;
 
 @Configuration
 public class MailTemplateConfiguration {
     @Bean
+    public SpringTemplateEngine templateEngine(ITemplateResolver templateResolver, SpringSecurityDialect sec) {
+        final SpringTemplateEngine templateEngine = new SpringTemplateEngine();
+        templateEngine.addTemplateResolver(templateResolver);
+        templateEngine.addTemplateResolver(emailTemplateResolver());
+        templateEngine.addDialect(new LayoutDialect());
+        templateEngine.addDialect(sec);
+        return templateEngine;
+    }
+
     public ClassLoaderTemplateResolver emailTemplateResolver() {
         ClassLoaderTemplateResolver emailTemplateResolver = new ClassLoaderTemplateResolver();
-        emailTemplateResolver.setPrefix("mail_templates/");
+        emailTemplateResolver.setPrefix("/mail_templates/");
-        emailTemplateResolver.setSuffix(".html");
         emailTemplateResolver.setTemplateMode("HTML5");
         emailTemplateResolver.setCharacterEncoding(StandardCharsets.UTF_8.name());
-        emailTemplateResolver.setOrder(1);
         return emailTemplateResolver;
     }
+
 }