The first two sections of the book cover a variety of
technologies. You should be familiar with many of the them, but you
may not be familiar with all of them. As an EJB programmer, you
probably know J2EE technologies like EJB and JNDI well, but you may
not be familiar with JDO. This section provides a JDO tutorial just
for you. Because you know EJB and JNDI so well, however, you will find
no use for the J2EE tutorial.
In short, not every tutorial chapter is for every reader of this
book. Some advanced readers, in fact, will have no use for any of the
tutorial chapters. I do expect most readers will find the need to
reference at least one of these chapters before tackling a chapter
earlier in the book. If you have no experience in JDO, for example,
you probably want to look at the JDO tutorial before reading the
chapter on JDO persistence. If you have no EJB experience, read the
J2EE chapter before tackling either of the EJB persistence
chapters. Finally, you need to understand the material in the JDBC and
SQL tutorials to appreciate just about any chapter in Part I or Part II.
