Exception occurs when using Gretty and Thymeleaf Layout Dialect together.

[mklinkj]

Hello.

After running the web server with Gretty and accessing the layout page, the following exception is exposed and nothing is displayed on the web browser screen.

• Exception Log

  ...
  Caused by: groovy.lang.MissingMethodException: No signature of method: org.thymeleaf.engine.Model.first() is applicable for argument types: () values: []
  Possible solutions: print(java.io.PrintWriter), print(java.lang.Object), find(), find(groovy.lang.Closure), is(java.lang.Object), write(java.io.Writer)
  ...
  

My project environment looks like this:

• Spring 6 (Not Spring Boot): 6.0.11
• Thymeleaf
  • thymeleaf-spring6: 3.1.2.RELEASE
  • thymeleaf-layout-dialect: 3.2.1
• Gretty: 4.1.0
  • Tomcat: 10.1.11
• Gradle: 8.2.1
• Java: 17

When I run the web project, I run it with the command below.

gradle clean appRun

I ran Gretty and accessed the page with the layout applied, and I definitely got the exception mentioned above.

However, when I deploy and run it directly into Tomcat without using Gretty, I get no errors. I'm not sure why.

✨ Example project to see the problem

I created an example project for you to check the problem.

• Example Project Zip File

  • gretty-with-thyemeleaf-layout.zip

• Example project GitHub address

  • https://github.com/mklinkj/QnA/tree/master/Gretty/gretty-with-thyemeleaf-layout

• How to run

  • Run with Gretty

    gradle clean appRun

  • Accessing the layout page in a web browser

    • http://localhost:8090/main

Have a nice day. 👍

[boris-petrov]

Thanks for the great reproduction and write-up!

What I see is that this first method doesn't generally exist on IModel/Model - here. It is defined in an extension in the other library here. And there is a Groovy extension module defined here. I guess Gretty doesn't read it for some reason or doesn't pass it on the classpath.

@f4lco any ideas?