I am a beginner in this Grails world but it is getting more interesting everyday. I got to the point where i don't feel like developing any new web application using any other framework.
My concern and my question is if you think that a grails application is ready for the enterprise world; I would like to know about performance, reliability, security, ect. And are there any outstanding real-world Grails applications?
As an example of a serious commercial use of Grails, the Swiss firm Canoo is working on an application to support risk management in re-insurance in collaboration with the Munich Re (one of the world's largest reinsurance companies) and others.
But Grails 1.1.2 is expected to focus on ironing out these issues.
I don't think that discussion is really about stability. It's just about bugs while developing. Once the bugs are overcome the apps are stable. Remember, that Grails is built on top of industry proven technologies like Spring and Hibernate. Grails isn't doing anything those frameworks can't do, just with MUCH less configuration and code involved.
I can't speak for everyone, but I know that I've introduced Grails into Government environments in Australia.
Whilst I can understand that conservative environments are naturally resistant to "newer" frameworks and products like Grails, there are still some fantastic opportunities to gain traction.
For example, I threw together two Grails applications in a day that have been in the "we need these apps but don't have the budget to spend a month developing them" category. I hear a lot of stories from other folks like this. Grails is really gaining traction in the "quick inhouse" app department, which I think will be the beach-head for bigger deployments in the longer-term.