SimpleSession to JSON - and back?

[John Moore]

I am trying to implement Cache and CacheManager to utilize Redis as a 
session store. Redis is a key/value store in which the keys and values 
are normally strings. I'm actually using Grails, and the inbuilt Grails 
JSON converters make it very straightforward to create a JSON string 
from a SimpleSession object (which is what I need to 'put' with the 
Cache implementation). My problem is implementing 'get'. How do I 
recreate a SimpleSession object from a JSON string? I imagine I could 
write some code to loop through the accessor methods and create one that 
way, but I was hoping there was some other much simpler way which I've 
overlooked.