Entity Bean Clients[J2EE]

Entity Bean Clients - Quiz Results

The correct answers are indicated below, along with text that explains the correct answers.

1.	Which of the following statements are true for the `findByPrimaryKey()` method? Please select all the correct answers.
	A.	The return is the home interface.
	B.	It takes a single argument, which is a class in the java.lang package.
	C.	It finds the data and associates it with a bean instance.
	D.	It creates an EJBObject associated with the primary key.
	You selected: none
	The correct answers are C and D. C is correct because the data is found using the primary key and the bean instance is created. D is correct because the bean creates the EJBObject and associates it with the primary key. The remote reference to the EJBObject is returned from the `findByPrimaryKey()`. This makes answer A incorrect. In addition, you also need the home interface to access the method. B is incorrect because the primary key can be any class, as long as it is RMI IIOP compliant. It is not limited to being a class in the java.lang package.

2.	Which of the following statements are true for the `create()` method? Please select all the correct answers.
	A.	It returns a remote reference to the EJBObject of the created bean.
	B.	It creates both the instance and the underlying data.
	C.	It throws the NoSuchObjectException if the arguments cannot map to a single data entity.
	D.	It takes multiple arguments that map to a single underlying data entity.
	E.	There can be 0 or more create methods.
	You selected: none
	The correct answers are A, B, D, and E. A is correct because the `create()` method does return a remote reference that allows access to the business methods. B is correct as the instance is created, perhaps from the pool. C is incorrect because the bean instance will throw this exception only from the `findByPrimaryKey(),` which is looking up a specific piece of data. D is correct because create can take one or more arguments. E is correct because there can be 0 or more `create()` methods. If there are no `create()` methods, then the instance will only map to data that already exists.