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SCWCD Certification Practice Tests SCWCD Study Guide (CX-310-081)

 

 

 

 

 

 

 

 
 
 SCBCD Certification Practice Test  

Features Of CertGear's SCBCD (CX-310-090) Certification Practice Test

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Free SCBCD Certification Practice Questions:

Consider the following snippet of deployment descriptor describing a CMR relationship between a Person and Phone:

<ejb-relation>

<description>Phone numbers of Person </description>
<ejb-relationship-role>
<ejb-relationship-role-name>PersonBean</ejb-relationship-role-name>
<multiplicity>One</multiplicity>
<relationship-role-source>
<ejb-name>PersonBean</ejb-name>
</relationship-role-source>
<cmr-field>
<cmr-field-name>phones</cmr-field-name>
<cmr-field-type>java.util.Collection </cmr-field-type>
</cmr-field>
</ejb-relationship-role>
<ejb-relationship-role>
<ejb-relationship-role-name>PhoneBean </ejb-relationship-role-name>
<multiplicity>Many</multiplicity>
<cascade-delete />
<relationship-role-source>
<ejb-name>PhoneBean</ejb-name>
</relationship-role-source>
</ejb-relationship-role>
</ejb-relation>

Which of the following statements are true?

A) The container expects the following accessor signatures:

public abstract Phone getPhones();
public abstract void setPhones(Phone phones);

B) Since a <cascade-delete> is defined, if a Phone object is deleted, the Person object will automatically be deleted.
C) The cascade-delete operation will NOT work in this situation as the relationship between phone and person is a many-to-many relationship
D) The Person bean can access the Phone object through its CMR fields using the abstract getters and setters in the ejbCreate() method.
E) None of the statements are true

  • [Ans: E]

  • Explanation: The <cmr-field> tag, defines the name of the CMR field that implements access to the relationship. The name provided is used to define the names of the CMR accessors and the type of the relation. In the example shown above, the CMR field name is phones and the type is Collection, so the container expects the following accessor signatures:

    public abstract Collection getPhones();
    public abstract void setPhones(Collection phones);

    The <cascade-delete> tag indicates that the role source object is deleted when the object on the other end of the relationship is deleted. In this example, when a Person object is deleted, all associated Phone objects are automatically deleted. However, the reverse is NOT true. if a Phone object is deleted, the Person object is NOT automatically deleted.
    The cascade delete operation should work correctly. One of the requirements for the cascade delete operation is that the other role in the relationship has a multiplicity of 'One'. In this example, a Phone object can ONLY belong to one person. Since a phone object cannot exist without a person, if the person object is deleted, the corresponding phone object will be deleted.

    A bean cannot access its CMR fields in the ejbCreate() method. The abstract getters and setters for the CMR fields cannot be used in the ejbCreate() method. However, in the ejbPostCreate() method, a bean can access all its CMR fields through its abstract getters and setters.

    References: http://java.sun.com/developer/technicalArticles/ebeans/EJB20CMP/

 

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