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Java EJB Quiz

Description: Java EJB Quiz
Number of Questions: 10
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Tags: java ejb
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What type of enterprise bean is used to embody application processing state information?

java

  1. javax.ejb.EnterpriseBean

  2. javax.ejb.SessionBean

  3. javax.ejb.MessageBean

  4. javax.ejb.EntityBean

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Correct Option: B

Which interfaces must be implemented by Message driven beans? (3 correct answers)

java

  1. javax.ejb.MessageDrivenBean

  2. java.io.Serializable

  3. javax.enterprise.deploy.model.J2eeApplicationObject

  4. javax.jms.MessageListener

  5. javax.ejb.EJBException

Show answer
Correct Option: A,D

Which methods should NOT be defined inside the home interface of a session bean? (2 correct answers)

java

  1. find methods

  2. multiple create() methods

  3. business methods

  4. remove() methods

Show answer
Correct Option: A

The persistence of Person and Address information in an application is implemented via BMP entity beans. Each Person must have exactly one Address. If a Person contains the primary key for Address in a persistent field, how should you implement the Person

java

  1. The ejbRemove() method of Person invokes the remove() method of Address.

  2. The ejbStore() method of Person invokes the ejbStore() method of Address.

  3. The ejbPassivate() method of Person invokes the ejbPassivate() method of Address.

  4. The ejbLoad() method of Person invokes the findByPrimaryKey() method of Address-Home.

  5. The ejbLoad() method of Person invokes the ejbLoad() method of Address.

Show answer
Correct Option: A,E

Before a message-driven bean (MDB) can be tested, the J2EE application server has been installed on a test machine and a connection factory and destination have been configured for the JMS provider. What other configuration task MUST be completed before t

java

  1. The native library directory in the classpath must be specified

  2. A message listener port must be defined

  3. The message listener service must be enabled

  4. A message passivation directory must be specified

Show answer
Correct Option: B

A course enrolment application needs to define a JDBC resource reference for a DB2 database in the deployment descriptor. Assuming that the name of the resource reference is "enrolment", what is the appropriate JNDI declaration?

java

  1. java:comp/env/jdbc/db2/enrolment

  2. java:comp/env/jdbc/enrolment

  3. java:comp/env/enrolment

  4. java:jdbc/env/db2/enrolment

Show answer
Correct Option: B

AI Explanation

To answer this question, we need to understand how JNDI (Java Naming and Directory Interface) declarations work for JDBC resource references.

JNDI is a naming service that allows Java software components to discover and access named resources. In the context of a Java EE application, JNDI is used to define and access resources such as databases.

In this question, the resource reference is named "enrolment" and it is a JDBC resource reference for a DB2 database. The appropriate JNDI declaration for this resource reference would be:

B. java:comp/env/jdbc/enrolment

The JNDI declaration consists of a hierarchical naming structure, starting with "java:comp/env" which refers to the "environment" namespace of the component. The "jdbc" component is then specified, followed by the name of the resource reference, which in this case is "enrolment".

Option A) java:comp/env/jdbc/db2/enrolment - This option is incorrect because it includes an additional "db2" component in the naming structure, which is not specified in the question.

Option C) java:comp/env/enrolment - This option is incorrect because it does not include the "jdbc" component in the naming structure, which is necessary for a JDBC resource reference.

Option D) java:jdbc/env/db2/enrolment - This option is incorrect because it includes "jdbc" and "db2" components in the naming structure, which are not specified in the question.

Therefore, the correct answer is B. java:comp/env/jdbc/enrolment. This option is correct because it follows the appropriate JNDI declaration for a JDBC resource reference named "enrolment".

The EJB Query Language is used

java

  1. to enhance the SQL96 standard with additional options for complex relationships

  2. instead of the findByPrimaryKey() method, to define alternative selection criteria

  3. to specify a concrete implementation for the find and select methods of CMP entity beans

  4. for accessing User Defined data types and Stored Procedures in the database.

Show answer
Correct Option: C

AI Explanation

To answer this question, we need to understand the purpose of the EJB Query Language (EJB QL) and how it is used.

Option A) to enhance the SQL96 standard with additional options for complex relationships This option is incorrect. EJB QL is not used to enhance the SQL96 standard. It is a separate query language specifically designed for working with Enterprise JavaBeans (EJBs).

Option B) instead of the findByPrimaryKey() method, to define alternative selection criteria This option is incorrect. EJB QL is not used as an alternative to the findByPrimaryKey() method. The findByPrimaryKey() method is used to retrieve an entity bean based on its primary key, while EJB QL is used for querying entities based on various criteria.

Option C) to specify a concrete implementation for the find and select methods of CMP entity beans This option is correct. EJB QL is used to specify the queries for the find and select methods of Container Managed Persistence (CMP) entity beans. These methods are used to retrieve data from the underlying database using the specified query.

Option D) for accessing User Defined data types and Stored Procedures in the database. This option is incorrect. EJB QL is not used for accessing User Defined data types and Stored Procedures in the database. It is primarily used for querying and retrieving data from entity beans.

Therefore, the correct answer is C) to specify a concrete implementation for the find and select methods of CMP entity beans.

Container managed transactions are defined via trans-attributes in the deployment descriptor. When a session bean demarcates the transaction and calls an Entity Bean, what is the best transactional setting for the Entity Bean?

java

  1. Supports

  2. Never

  3. Required

  4. RequiresNew

Show answer
Correct Option: C

When a packaged enterprise application (EAR file) is deployed to the application server, which activities can be performed? (2 correct answers)

java

  1. Specify the "context root" for each web application

  2. Generate access beans for any enterprise beans

  3. Assign alias names to the attributes of the Entity beans

  4. Map the Entity beans’ attributes to the relational database tables

Show answer
Correct Option: A,D

What isnottrue of a Java bean?

java

  1. There are no public instance variables.

  2. All persistent values are accessed using getxxxand setxxxmethods.

  3. It may have many constructors as necessary.

  4. All of the above are true of a Java bean.

Show answer
Correct Option: C
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