arjangch opened a new issue, #15061:
URL: https://github.com/apache/grails-core/issues/15061

   ### Expected Behavior
   
   In Grails-doc 
[Render](https://docs.grails.org/latest/ref/Controllers/render.html) page, one 
of example has to change a bit. This example doesn't work 
   
   `render(contentType: "text/xml") {
       books {
            for (b in books) {
                book(title: b.title, author: b.author)
            }
       }
   }`
   
   But if we change **books** to **booksList** it will work
   
   `render(contentType: "text/xml") {
       books {
            for (b in booksList) {
                book(title: b.title, author: b.author)
            }
       }
   }`
   
   
   ### Actual Behaviour
   
   It throws exception
   `2025-09-09T10:38:57.342-04:00 ERROR 28986 --- [nio-8083-exec-1] 
o.g.web.errors.GrailsExceptionResolver   : MissingMethodException occurred when 
processing request: [GET] /example3/student/showRenderJsonBad
   No signature of method: java.util.ArrayList.call() is applicable for 
argument types: 
(com.arjang.StudentController$_showRenderJsonBad_closure3$_closure10) values: 
[com.arjang.StudentController$_showRenderJsonBad_closure3$_closure10@37a4c94]
   Possible solutions: tail(), tail(), wait(), any(), last(), last(). 
Stacktrace follows:`
   
   ### Steps To Reproduce
   
   See my example in Github.  This won't work 
   `    def showRenderJsonBad() {
           def student = Student.findAll()
           render(contentType: "application/json") {
               student {
                   for (t in student) {
                       student (name: t.name, lastname: t.lastname)
                   }
               }
           }
       }`
   
   
   
   ### Environment Information
   
   My sdkrc file 
   java=21.0.8-zulu
   gradle=8.14.3
   groovy=4.0.28
   grails=7.0.0-RC1
   
   ### Example Application
   
   https://github.com/arjangch/grails-project-helper/tree/main/example3
   
   ### Version
   
   7.0.0-RC1


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