Using thymeleaf template for sending Mail with Spring

Question

I'm trying to use Thymeleaf template for Spring application to send mail, I am taking the reference from here https://github.com/thymeleaf/thymeleafexamples-springmail/

I am not getting any error but still it doesn't work ..I am using the same code as given in github still no luck ...Can anybody suggest how to do that??

Following is the method which is used to send mail ...

public void sendSimpleMail(
        final String recipientName, final String recipientEmail, final Locale locale) 
        throws MessagingException {
    final Context ctx = new Context(locale);
    ctx.setVariable("name", recipientName);
    ctx.setVariable("subscriptionDate", new Date());
    ctx.setVariable("hobbies", Arrays.asList("Cinema", "Sports", "Music"));
    final MimeMessage mimeMessage = this.mailSender.createMimeMessage();
    final MimeMessageHelper message = new MimeMessageHelper(mimeMessage, "UTF-8");
    message.setSubject("Example HTML email (simple)");
    message.setFrom("[email protected]");
    message.setTo(recipientEmail);
    // Create the HTML body using Thymeleaf
    final String htmlContent = this.templateEngine.process("email-simple.html", ctx);
    message.setText(htmlContent /* isHtml */);

    // Send email
    System.out.println("........");
   this.mailSender.send(mimeMessage);
}

If I remove the line which is creating the html body using thymeleaf and send a ordinary mail it works but not with template ..

This is the line which causing problem ... just redirect to error page

final String htmlContent = this.templateEngine.process("email-simple.html", ctx);

Following is the error I am getting ..

org.thymeleaf.exceptions.TemplateProcessingException: Resource resolution by ServletContext with org.thymeleaf.resourceresolver.ServletContextResourceResolver can only be performed when context implements org.thymeleaf.context.IWebContext [current context: org.thymeleaf.context.Context]
    at org.thymeleaf.resourceresolver.ServletContextResourceResolver.getResourceAsStream(ServletContextResourceResolver.java:74)
    at org.thymeleaf.TemplateParser.parseDocument(TemplateParser.java:254)
    at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:812)
    at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:769)
    at com.ivb.coep.other.EmailService.sendSimpleMail(EmailService.java:72)
    at com.ivb.coep.controller.MainController.sendTextMail(MainController.java:83)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

Answer 1

I got it working finally ... I changed the following line

 final Context ctx = new Context(locale);

with

final WebContext ctx = new WebContext(request,request.getContext(),locale);

Now I am able to send any template or attachment anything works great ..!!

Answer 2

You are getting this issue because, it seems, you don't have a mail folder inside WEB-INF/classes folder.

According to the configuration mentioned below, it is expecting a mail folder inside WEB-INF/classes folder.

<bean id="emailTemplateResolver"     class="org.thymeleaf.templateresolver.ClassLoaderTemplateResolver">
    <property name="prefix" value="mail/" />
    <property name="templateMode" value="HTML5" />
    <property name="characterEncoding" value="UTF-8" />
    <property name="order" value="1" />
    <!-- Template cache is true by default. Set to false if you want -->
    <!-- templates to be automatically updated when modified.        -->
    <property name="cacheable" value="true" />
</bean>

So, create a folder with name "mail" inside your "resouces" folder and keep the mail templates inside "mail" folder. Make sure that you got this "mail" folder inside WEB-INF/classes folder while deploying. This should solve your problem

IMO, we shouldn't use WebContext as it requires a "request" object and strong coupling the mail with request is not a good idea.