Java How to Program, Early Objects, 11th Edition

36.5 Module-Dependency Graphs: A Deeper Look

Previously, we’ve shown two module-dependency graphs. Here we continue our discussion of module graphs and show the errors that occur if a module directly or indirectly requires itself—known as a cycle.

36.5.1 java.sql

Figure 36.16 shows the module-dependency graph for a module named modulegraphtest that depends on the java.sql module, per the following module declaration:

module modulegraphtest {
 requires java.sql;
}

Fig. 36.16 Dependency graph for a module that depends on java.sql.

Figure 36.16 Full Alternative Text

NetBeans highlights the module declared by the module declaration (modulegraphtest ...