The graphic shows three classes and the methods in the classes:

Methods in the EmployeeBenefitManager session bean (stateless):

Fields and methods in the Employee entity bean, a container-managed bean:

Fields and methods in the Benefit entity bean, a container-managed bean:

The Employee and the Benefit entity beans have a many-to-many relationship: an Employee can have zero or more Benefits, and a Benefit can be enrolled in by zero or more Employees.