The document discusses several topics related to Java enterprise application development including business logic, n-tier architecture, remote method invocation (RMI), enterprise Java beans (EJB), and session beans. It provides examples of how business logic manages data transformation and workflows. It also explains that RMI allows methods to be invoked on remote objects using stub and skeleton objects, while EJB builds on RMI to provide services like security and transactions through an application server. Finally, it defines session beans as encapsulating business logic and being invoked by local, remote, or web service clients, and describes the different types of session beans.