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How would you suggest learning JDO?

Sonny Pondrom
Ranch Hand

Joined: Jun 05, 2001
Posts: 128
Where are some sources? Is there more than one book?
Lasse Koskela

Joined: Jan 23, 2002
Posts: 11962
Yes, there are more than one book:
Java Data Objects by David Jordan and Craig Russell
Java Data Objects by Robin Roos
Core Java Data Objects
Using and Understanding Java Data Objects

For online resources, I'd start from the JDO Central.

Author of Test Driven (2007) and Effective Unit Testing (2013) [Blog] [HowToAskQuestionsOnJavaRanch]
I agree. Here's the link:
subject: How would you suggest learning JDO?
It's not a secret anymore!