Modeling a Relationship Between Entity Beans

Relationships can be modeled between any two entity beans on a class diagram. The entity bean at each end of a relationship must be EJB 2.0, with container-managed persistence and have a local interface.

To model a relationship between two Enterprise JavaBeans on a diagram:

Click the icon for the relationship you want to create, from those listed on the EJB Component Palette:

Relationship 1 to *
Directed Relationship 1 to 1
Directed Relationship 1 to *
Directed Strong Aggregation

Notes: The navigability and multiplicity of a relationship end can be changed after it has been created.

If these icons are not displayed, select EJB from the dropdown on the Component Palette.

Click the entity bean at the 'owning', or 'from', end of the relationship.
Note: If you want to represent this relationship using a container-managed relationship (CMR) field, this is the bean in which the field will be created.
Click the entity bean at the 'to' end of the relationship.
Click the relationship line on the diagram, then click the text fields adjacent to the association to enter the relationship name.
Note: To change the multiplicity of a relationship end on the diagram, right-click on the relationship end and choose either Multiplicity | 1 or Multiplicity | *.

Related topics

Modeling a Bean on a Diagram
Modeling a Reference Between Modeled Beans