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So, the solution Jeff proposed in the comments (thanx!) is the following:

In your domain class, define the id as String and set it to assigned:

If you have something that is reading the body of the request before your request.withFormat method is invoked, that would explain the "Stream closed" error.

Common examples of that include a filter or interceptor in your app that is ready the body of the request before your controller action executes, and if the controller action accepts a command object, the body of the request has to be read before your code executes.

I managed to get the error to go away. All I needed to do it all the dependency config for the related tasks (in build.gradle):

Specify the classpath when you run your program:

In my case I added groovy:groovy-all dependency in build.gradle

Example:

As @Jeff Scott Brown stated, this behaviour is due to: https://github.com/grails/grails-data-mapping/blob/c69add974963a3a1fcab27271d7ab4fa7c1faee2/grails-datastore-gorm/src/main/groovy/org/grails/datastore/gorm/transform/AbstractMethodDecoratingTransformation.groovy#L113

UPDATE: Please review my improved answer.

This is my (kind of) old-school approach:

First, since the allCaps requirement might be useful not only for that particular controller/action, I would add an asMap method to the Breakfast domain class itself. It capitalizes all String properties if its param allCaps is true, and returns a Map with all object's properties:

You can override this method using Groovy extensions module. It works fine in a regular Groovy code, but it should also work when used with Grails framework. Consider the following example: