I've been working through these two modules and have run into a number of problems involving both the instructional material and solution code (which I've had to resort to on occasion to verify that my code was written as instructed).
Sun's help desk, while friendly, has been really lame on getting these items looked at. I don't know if they've been gutted through the Oracle acquisition, but frankly they've been ineffective and frustrating to work with.
Just a word of warning. IMO these products are simply too expensive (thankfully I didn't have to pay for them myself) to not get the level of support they would seem to deserve at this price.
There is some good information provided in the training material, guess taking the classes in person would help get around these issues. At least there would be a human to yell at.