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Jeff's tutorial dates from 2010. So if you start with grails 1.3.5 and use spring-security 1.0.1 you MIGHT get somewhere.
I too am a relative newcommer to Grails but the one thing I have learned is that *none* of the examples that were created for grails 1.x.x work when you try to "do" them using Grails 2.x.x.
There are just too many small changes that you have to know how about.
OK - to be accurate I suppose I should say - I have discovered that I do not posses the skills to enable me to convert Grails 1.x.x examples to Grails 2.x.x
Of course - if any other reader knows *any* examples that they have converted From Grails 1.x.x to 2.x.x then I guess we would both love to know where they can be found (EVEN IF we have to do the conversion again ourselves). Honestly that would be wonderful.