Online Access Free 1Z0-807 Exam Questions

You are consulting with a team that has maintained several legacy database for years. They have reviewed the JPA spec and are wondering if the technology would offer benefits over this current SQL base.
Which statement identifies a risk of adopting JPA?

• A.JPA may be able to model every table as a class.
• B.JPA's query languagerelies on a container to manage the persistence layer.
• C.JPA only works with well-known data models.
• D.JPA doesn't provides ACID semantics.
• E.JPA could render code that requires extensive SQL tuning to perform well.

Which two statements are true about Java integration technologies?

• A.Remote Method Invocation (RMI) helps to connect subsystems in a loosely coupled manner.
• B.JMS helps to broadcast messages to multiple Java-based receivers.
• C.Java Message Service (JMS) helps in synchronous messaging between Java and non-Java systems.
• D.Java Connector Architecture (JCA) helps to integrate with heterogeneous legacy enterprise information systems.

Your company is creating a Java EE corporate wide workflow system in which significant internal business events are consumed by multiple applications. Due to multi-year development plans, many of these applications do not exist yet, even at the design stage. IT has defined standard data formats for these events in the form of small XML documents. Also, the rules for how an application filters and processes events are not fixed In advance and can change over the life of the application.
Which combination of technologies is best for distributing and consuming these events throughout the company?

• A.Java Message Service (JMS)topicsand message-driven beans
• B.Remote Method Invocation (RMI) and stateless session beans
• C.HTTP client library and servlets
• D.Relational database and JDBC
• E.JMS queues and message-driven beans

Which three statements are true about inheritance?

• A.Inheritance allows you to modify the behavior of objects.
• B.It should be possible to substitute the derived class for its base class.
• C.Inheritance promotes encapsulation better than interfaces.
• D.The derived class must override all methods of the base class.

Which are the objectives of the Strategy pattern? (Choose Two)

• A.To define the skeleton of an algorithm, deferring some steps to subclasses
• B.To define a family of algorithms, encapsulate each one, and make them interchangeable
• C.To allow subclasses to redefine certain steps of an algorithm without changing the algorithm's structure
• D.To define an object that encapsulates how a set of objects interacts
• E.To decouple an abstraction horn its implementation so that the two can vary independently