310-091 Sun Certificed Bus. Component Developer java EE Platform 5 Practice Exam

Demo Question 1.

A developer is creating an entity which is mapped to a table that has a primary key constraint defined on two character columns and would like to use mapping defaults as much as possible to simplify the code. Which two mapping options can be chosen? (Choose two.)

A. Use an @ld property that constructs a private field as a concatenation of two columns.
B. Use a separate class to map those two columns and use an @ldClass annotation to denote the primary key field or property in the entity.
C. Use a separate @Embeddable class to map those two columns and use @Embeddable annotation to denote a single primary key field or property in the entity
D. Use a separate @Embeddable class to map those two columns and add two fields or properties to the entity, each marked as @ld that correspond to the fields or properties in the embeddable class.
E. Use a separate class to map those two columns. Specify that class using @ldclass annotation on the entity class Add two fields or properties to the entity, each marked as @ld that correspond to the fields cm properties in that separate class.


Display Answer

Answer: C, E

Explanation: