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Code d'Examen: 1Z0-895
Nom d'Examen: Oracle (Java Platform, Enterprise Edition 6 Enterprise JavaBeans Developer Certified Expert Exam)
Questions et réponses: 90 Q&As
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NO.1 A developer needs to deliver a large-scale enterprise application that connects developer chooses an
EJB 3.1-compliant application server, which three are true about the EJB business component tier?
(Choose three.)
A. Load-balancing is NOT a guarantee for all EJB 3.1 containers.
B. Clustering is guaranteed to be supported by the EJB 3.1 container.
C. Thread pooling can be optimized by the Bean Provider programmatically.
D. Bean Providers are NOT required to write code for transaction demarcation.
E. Support for server fail-over is guaranteed for an EJB 3.1-compliant application server.
F. EJB 3.1 compliant components are guaranteed to work within any Java EE 6 application server
Answer: A,C,F
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NO.2 A developer examines a list of potential enterprise applications and selects the most appropriate
technologies to use for each application.
For which two applications is EJB an appropriate solution.? (Choose two.)
A. To render a GUI for mobile clients.
B. As a container for web-tier components including JSP.
C. As a Web service endpoint accessed by non-Java clients.
D. To receive and respond to HTTP Post requests directly from a web browser.
E. As an online shopping cart which can persist across multiple sessions with a single client.
Answer: C,E
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NO.3 private int value;
NO.4 A developer wants to write a stateful session bean using the following interface as local business
interface:
1. package acme;
2. public interface Bar {
3. public void bar ();
4. }
Assuming there is not an ejb-jar.xml file, which code can be inserted into Lines 4-6 below to define the
bean with the ejb name of BarBean?
1. package acme;
2. import javax.ejb.*;
3. import java.io.*;
4.
5.
6.
NO.5 public int getValue () {return value; }
A session bean ClientBean has a business method doSomething and an ejb-ref with ejb-ref-name
fooRef
that is mapped to FooBean s Foo interface.
11. @Resource private SessionContext SessionCtx;
12. public void doSomething () {
NO.6 A stateful session bean contains a number of instance variables. The types of instance variables A and
B are serializable. Instance variable B is a complex type which is populated by many business calls, and
can, therefore, not be refilled by the client without starting all over. A helper instance variable C is defined
as having a Serializable type, and can hold all the information which is in variable B. for example, B is of
type XML-DOM tree and C of Type String.
Which two solutions, when combined, maintain the state of the session bean over a passivation and
activation by the container? (Choose two.)
A. The value of helper variable C is used to create the value of Instance variable B in the beans no-arg
constructor.
B. The value of helper variable C is used to create the value of instance variable B in a @postcreate
annotated method.
C. The value of helper variable C is used to create the value of instance variable B in a @postActivate
annotated method.
D. Instance variable A must be made null and instance variable B must be converted to a Serializable type
and assigned to another instance variable in a @preDestroy annotated method.
E. Instance variable A must be defined transient. Instance variable B must be converted to a Serializable
type, set to null, and assigned to the instance variable C in a @PrePassivate annotated method.
Answer: C,E
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NO.7 A developer writes a stateful session bean FooBean with one remote business interface Foo. Foo
defines an integer / setter method pair implemented as:
NO.8 Which API must an EJB 3.1 container make available to enterprise beans at runtime? (Choose one)
A. The JXTA 1.1 API
B. The MIDP 2.0 API
C. The Java SE 6 JNDI API
D. The Java SE 5 JDBC API
Answer: C,D
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NO.9 Foo foo1 = (Foo) sessionCtx.lookup("fooRef");
NO.10 }
A. @Stateful
public class BarEJB implements Bar {
public void bar () {}
B. @Stateful (name = Bar )
public class Barbean implements Bar {
public void bar () {}
C. @Stateful
public class BarBean implements Serializable, Bar {
public void bar () {}
D. @Stateful (name = bar )
public class BarBean implements Serializable, Bar {
public void bar () throws java.rmi.RemoteException {}
Answer: C
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7.A developer creates a stateful session bean that is used by many concurrent clients. The clients are
written by other development team; and it is assumed that these clients might not remove the bean when
ending their session. The number of concurrent sessions will be greater than the defined bean cache
size.
The developer must consider that the state of the session bean can be influenced by either passivation or
timeout.
Which three actions should the developer take to make the bean behave correctly in passivation and
timeout situations? (Choose three.)
A. Release references to resources in a @Remove annotated method.
B. Re-establish references to resources in an omit annotated method.
C. Release references to resources in a @preDestroy annotated method.
D. Release references to resources in a SPrePassivate annotated method.
E. Re-establish references to resources in a @PostActivate annotated method.
Answer: C,D,E
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NO.11 public void setValue (int i) {value = i; }
NO.12 Which two statements are true? (Choose two.)
A. Typically, remotely accessible objects should be coarse-grained.
B. If a client accesses an enterprise bean locally such access must be mediated by the EJB container.
C. A given enterprise bean's transaction information is immutable because it is deployed across various
containers.
D. If a container provides services NOT required by the EJB specification, then that container is NOT
considered to be an EJB container.
E. An enterprise bean's transaction Information can be accessed by external tools only if the information
is contained in an XML deployment descriptor.
Answer: B,D
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NO.13 Assume you would like to receive notification from the container as a stateless session bean transitions
to and from the ready state.
Which of the following life cycle back annotations would you use? (Choose one.)
A. @PostConstruct, @PostDestroy
B. @PostConstruct, @PreDestroy
C. @PreConstruct, @PostDestroy
D. @PostConstruct, @PostDestroy, @Remove
E. @PostConstruct, @PreDestroy, @Remove
Answer: B
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NO.14 Foo foo2 = (Foo) sessionCtx.lookup("fooRef");
NO.15 foo1.setvalue(1);
Which statement is true after the code at line 15 completes?
A. Foo1.getValue () = = 0 and foo2.getValue() = = 0
B. Foo1.getValue () = = 0 and foo2.getValue() = = 1
C. Foo1.getValue () = = 1 and foo2.getValue() = = 0
D. Foo1.getValue () = = 1 and foo2.getValue() = = 1
Answer: D
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10.A developer writes a stateless session bean FooBean with one remote business interface FooRemote
containing one business method foo. Method foo takes a single parameter of application-defined type
MyData.
11. public class MyData implements java.io.Serialization {
12. int a;
13. }
Methods foo is implemented with the FooBean class as:
11. public void foo (MyData data) {
12. data.a = 2;
13. }
Another session bean within the same application has a reference to FooRemote in variable fooRef and
calls method foo with the following code:
11. MyData data = new MyData();
12. data.a = 1;
13. Fooref.foo(data);
14. System.out.printIn(data.a);
What is the value of data.a when control reaches Line 14 of the client?
A. 0
B. 1
C. 2
Answer: B
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