Free Oracle 1Z0-807 Exam Dumps Questions & Answers

You are the lead technical designer for a new B2C retail application. A key goal is to minimize design and build complexity in order to maximize speed to market.
Which three features of JPA make it the most appropriate technology to use in building the persistence layer of the application?

• A.  JPA ensures thread safe semantics
• B.  JPA provides vendor-neutral database access
• C.  JPA provides ACID semantics
• D.  JPA does not require an EJB container
• E.  JPA ensures optimal database access logic
• F.  JPA provides transparent scalability

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

Which three actions represent best practices when implementing an exception handling strategy for an application?

• A.  Always throw exceptions in methods that are designed for exception handling.
• B.  Always include information specific to the error when logging an exception.
• C.  Create a customuncheckedexception if the action to resolve the exception cannot be defined.
• D.  Always log the specific exception before re-throwing a wrapped exception.

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

You are the architect of a JEE-based product that customers can configure to meet their own security requirements. You want to enforce basic without sacrificing customers ability to customize the product.
Which is the best method to support both requirements?

• A.  Build a custom security service to handle authorization
• B.  Customize the JRE sandbox model by using local variables
• C.  Define base roles and users declaratively
• D.  Define base roles and users programmatically