(Quick Reference)
                cache
Purpose
Enables the Hibernate second-level cache for the domain class.
Examples
class Book {
    …
    static mapping = {
        cache true
    }
}Description
Usage: 
cache(boolean/string/map)Arguments:
- usage- The cache usage. Can be- read-only,- read-write,- nonstrict-read-writeor- transactional
- include(optional) - Whether to include non-lazy associations. Can be- allor- non-lazy
You enable caching per domain class, for example:
static mapping = {
    cache true
}This will configure the domain class to use a 'read-write' cache, but you can configure whatever cache policy is appropriate (and supported by the cache implementation):
static mapping = {
    cache 'transactional'
}or
static mapping = {
    cache usage: 'read-only', include: 'non-lazy'
}You can also configure the cache policy on a per-association basis:
class Author {    static hasMany = [books: Book]    static mapping = {
        books cache: true // or 'read-write' etc.
    }
}For more information see the section on 
Caching in the user guide.