db4o is a popular object database available both for Java and .NET. I have used it sporadically over several years and can highly recommend it. It is a non-intrusive, very simple to learn, object persistence system that stores any complex object with one single line of code. Unfortunately Db4o is still not as popular with Java developers as we thought it would be. So we thought of giving you a very easy and useful guide to learning db4O. The following guide will focus on Java

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