Java EE 7 Application Developer Free Practice Test — 30 Questions

Question 1

In a financial application, a bank needs to send transaction notifications to multiple departments whenever a transaction occurs. Each department should receive the same notification to take appropriate actions. Which messaging model would best suit this requirement, and why?

Accepted Answer

Publish/Subscribe model, as it allows multiple subscribers to receive the same message simultaneously.

Question 2

A developer is tasked with creating a SOAP-based web service that will allow external clients to retrieve and update user information stored in a remote database. The developer needs to ensure that the service is well-defined and can be easily consumed by clients. Which approach should the developer take to effectively implement this web service using JAX-WS?

Accepted Answer

Use JAX-WS annotations to define the service interface and implement the business logic, ensuring that the WSDL is generated automatically for client consumption.

Question 3

A company is developing a new enterprise application that requires high availability and scalability to handle fluctuating user loads. The development team is considering different application servers to deploy their Java EE 7 application. Which application server feature would be most critical for ensuring that the application can efficiently manage user requests and maintain performance during peak usage times?

Accepted Answer

Support for clustering and load balancing to distribute requests across multiple server instances

Question 4

A developer is working on a feature in a separate branch $B$ while the main branch $M$ has also received updates. If the changes in branch $B$ can be represented as $B = \{b_1, b_2, b_3\}$ and the updates in the main branch as $M = \{m_1, m_2\}$, what will be the new state of the main branch after merging, assuming there are no conflicts, represented as $M\'$?

Accepted Answer

$M' = M \cup B = \{m_1, m_2, b_1, b_2, b_3\}$

Question 5

In a Java EE application, a developer is tasked with ensuring that the integration between the EJB layer and the database is functioning correctly. They decide to implement a testing strategy that not only verifies the individual components but also assesses their interactions. Which approach should the developer prioritize to effectively test these integrations?

Accepted Answer

Implement integration tests that validate the interactions between EJBs and the database using a test database.

Question 6

In a Java EE application designed for an online retail platform, the architecture is divided into multiple tiers to enhance scalability and maintainability. If a developer needs to implement a new feature that requires complex business logic and transaction management, which tier should they primarily focus on to ensure that the application adheres to the Java EE architecture principles?

Accepted Answer

Business tier

Question 7

A Java EE developer is tasked with configuring a new web application that requires specific security constraints and resource references. The developer is considering whether to use annotations or a deployment descriptor for this configuration. What would be the most appropriate approach to ensure that the application adheres to best practices for security and resource management?

Accepted Answer

Utilize a deployment descriptor to explicitly define security constraints and resource references, ensuring clear separation of configuration from code.

Question 8

A Java EE application is designed to process user transactions. During a transaction, an unexpected error occurs, causing an exception to be thrown. The developer wants to ensure that the application handles this exception gracefully, providing feedback to the user while also maintaining the integrity of the transaction. Which approach should the developer take to effectively manage this exception?

Accepted Answer

Use a try-catch block to catch the exception, log the error, and provide user feedback, while ensuring that the transaction is rolled back if necessary.

Question 9

In a Java EE application, a developer is tasked with ensuring that the integration between the EJB layer and the database is functioning correctly. Which testing strategy would be most effective for this scenario, considering the need to validate the interactions between these components?

Accepted Answer

Implementing integration tests that verify the EJB methods against the actual database interactions

Question 10

A developer is tasked with implementing a messaging system that sends user profile updates from a web application to a backend service. The updates include various attributes such as username, email, and preferences. Which messaging format would be most appropriate for this scenario to ensure that the data is transmitted in a structured manner and can accommodate varying data types?

Accepted Answer

Map Message

Question 11

A company is developing a new web application that requires a service endpoint to handle user authentication. The development team is debating whether to implement the endpoint as a stateless or stateful service. What would be the most appropriate choice for this scenario, considering scalability and performance?

Accepted Answer

Implement the endpoint as a stateless service to enhance scalability and reduce server resource consumption.

Question 12

A developer is tasked with retrieving a list of all customers who have placed orders in the last month. They need to write a JPQL query that not only fetches the customer details but also ensures that the query is efficient and adheres to best practices. Which of the following JPQL queries would best achieve this goal?

Accepted Answer

SELECT c FROM Customer c JOIN c.orders o WHERE o.orderDate >= CURRENT_DATE - INTERVAL '1' MONTH

Question 13

A web application is designed to handle user requests through a servlet that maintains a static variable to count the number of active sessions. During peak usage, multiple requests are sent to the servlet simultaneously. Which aspect of the servlet lifecycle should the developer focus on to ensure that the session count is accurate and thread-safe?

Accepted Answer

The `service()` method, to ensure that concurrent requests are handled correctly and the static variable is updated in a thread-safe manner.

Question 14

A financial application is designed to handle multiple transactions for various users simultaneously. Each user must maintain a unique session that tracks their transaction history and preferences throughout their interaction with the application. Given this requirement, which type of session bean would be most appropriate to implement in this scenario to ensure that user-specific data is preserved across multiple requests?

Accepted Answer

Stateful session bean

Question 15

In a Java EE application designed for an online retail platform, a developer needs to implement a feature that processes customer orders. The application architecture includes servlets for handling HTTP requests, EJBs for business logic, and JSF managed beans for user interface management. Which component should the developer primarily utilize to ensure that the order processing logic is executed in a transactional context, allowing for rollback in case of failure?

Accepted Answer

Enterprise JavaBeans (EJBs)

Question 16

A financial application needs to integrate with a third-party SOAP web service to retrieve real-time stock prices. The service requires authentication and returns data in XML format. As a developer, you need to ensure that the application can handle both successful responses and potential errors from the service. Which approach would best ensure that your application can effectively manage these interactions?

Accepted Answer

Implement a robust error handling mechanism that parses the XML response for both successful data and fault messages, while also ensuring secure transmission of credentials.

Question 17

In a Java EE application, you are tasked with implementing a configuration management system that should be accessible by all users and sessions. You decide to use an application-scoped bean for this purpose. What is a critical consideration you must keep in mind regarding the use of this application scope?

Accepted Answer

You need to ensure thread safety to prevent concurrent modifications from affecting the shared state.

Question 18

A developer is tasked with designing a Java EE application that requires handling user sessions while maintaining state across multiple interactions. The application also needs to process messages from a queue asynchronously to ensure that user requests are handled efficiently without blocking the main application flow. Given these requirements, which type of EJB should the developer primarily utilize to achieve optimal performance and maintainability?

Accepted Answer

Stateful session beans for managing user sessions and message-driven beans for asynchronous processing

Question 19

A Java EE application is being prepared for deployment in a production environment. The deployment descriptor `web.xml` is being reviewed to ensure that all necessary configurations are in place. Which of the following statements best describes the role of the deployment descriptor in this context?

Accepted Answer

It defines the configuration for servlets, filters, and listeners, specifying their initialization parameters and mapping URLs to servlets.

Question 20

In a Java EE application, you have a Singleton Session Bean that maintains a counter initialized to $C_0 = 0$. If $N = 10$ clients concurrently access the bean to increment the counter, what is the expected final value of the counter if the increment operation is properly synchronized?

Accepted Answer

$C_f = 10$

Question 21

In a Java EE 7 application, a developer is tasked with creating a web page that needs to maintain a consistent layout across multiple views, including a header, footer, and sidebar. The developer decides to use Facelets for this purpose. Which approach should the developer take to ensure that the layout is reusable and maintainable while allowing for specific content to be defined in each view?

Accepted Answer

Use `` to define a base template and `` to specify content areas for each view.

Question 22

A developer is tasked with creating a servlet that processes user login requests. The servlet must handle both GET and POST methods appropriately. During the implementation, the developer realizes that the `doGet()` method is being called instead of `doPost()` when the login form is submitted. What could be the most likely reason for this behavior?

Accepted Answer

The login form's method attribute is set to "GET" instead of "POST".

Question 23

A company is developing a new web application that requires a RESTful service to manage user data. The development team is tasked with creating a service endpoint that can handle various HTTP methods and return data in both JSON and XML formats. They need to ensure that the endpoint is not only functional but also optimized for performance and security. Which approach should the team take to effectively implement this service endpoint?

Accepted Answer

Utilize JAX-RS annotations to define resource classes and methods, implement content negotiation for JSON and XML, and apply security filters to protect sensitive data.

Question 24

A financial services application needs to send transaction alerts to multiple departments simultaneously, ensuring that each department receives the same information without any loss of messages. Which messaging model should the application utilize to achieve this requirement effectively?

Accepted Answer

Publish-Subscribe (Pub-Sub) model

Question 25

In a recent project, your team is tasked with modernizing a legacy Java EE application to align with current industry trends. You decide to adopt a microservices architecture and utilize cloud technologies. Which of the following strategies would best support this transition while ensuring the application remains maintainable and scalable?

Accepted Answer

Refactor the application into smaller, independent services that communicate via REST APIs, leveraging JAX-RS for service creation.

Question 26

In a Java EE 7 application, you are tasked with implementing a feature where multiple components need to respond to a user action of submitting a form. You decide to use the Event and Observer pattern. Which approach would best ensure that all relevant components are notified without creating tight coupling between them?

Accepted Answer

Define an event class that encapsulates the form submission data and use the `@Observes` annotation in each observer to handle the event.

Question 27

In a web application designed for an online bookstore, a developer needs to implement user authentication and maintain user sessions across multiple pages. Which approach should the developer take to ensure that user data is preserved throughout the user\'s interaction with the site while adhering to best practices in the Servlet API?

Accepted Answer

Use HttpSession to store user information after successful authentication, allowing retrieval across multiple requests.

Question 28

In a Java EE application, you are tasked with implementing a message-driven bean that processes orders from a JMS queue. The application needs to ensure that each order is processed exactly once, even in the event of a failure during processing. Which of the following design considerations should you prioritize to achieve this requirement?

Accepted Answer

Implement a transaction management strategy that ensures message acknowledgment only after successful processing.

Question 29

A financial services company is developing a new application that requires handling user sessions for transactions, where users can perform multiple operations in a single session. The development team is considering using Enterprise JavaBeans (EJB) to manage these operations. Which type of EJB would be most appropriate for maintaining the state of user transactions throughout the session while ensuring efficient resource management?

Accepted Answer

Stateful Session Bean

Question 30

A developer is working on a Java EE 7 web application that interacts with a database. During a transaction, an unexpected error occurs, causing an `SQLException` to be thrown. The developer wants to ensure that the transaction is rolled back and that the error is logged for further analysis. Which approach should the developer take to handle this exception effectively?

Accepted Answer

Use a try-catch block around the transaction code, catch the `SQLException`, log the error, and then throw a `RollbackException` to ensure the transaction is rolled back.

Java EE 7 Application Developer Free Practice Test — 30 Questions

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