PL/SQL-Java Bridge

If you have Java programs you want to run within your report, you can do so by using the PL/SQL-Java bridge provided in Oracle Reports. Here, you can write PL/SQL to call out to Java classes you've already written. When you run the report, Oracle Reports creates PL/SQL packages that call the external Java classes, thus saving you coding time.

Integration with Oracle JDeveloper
Building a Paper Report Using the Barcode Bean (Example)