Where HSQLDB and Hibernate Fit into Our Architecture

Before we get too far along with HSQLDB and Hibernate, it is a good idea to revisit our architecture diagram that we developed earlier in this book. Figure 5.3 shows the diagram; notice where HSQLDB and Hibernate fit into the big picture (top-right).

Figure 5.3. High-level architecture for Time Expression.

In later chapters, when we develop our web and schedule job-related code, we will need the classes and database we will create in this chapter.