|Exam Name||:||Enterprise Application Development with IBM Web Sphere Studio, V5.0|
|Questions and Answers||:||104 Q & A|
|Updated On||:||February 19, 2018|
|PDF Download Mirror||:||[000-287 Download Mirror]|
|Get Full Version||:||Pass4sure 000-287 Full Version|
Which of the following statements are TRUE for EJB Query Language (QL) as
defined by the EJB 2.0 specification?
EJB QL queries can be used with BMP entity beans.
EJB QL applies to CMP entity beans only.
The ejbSelect method can return local EJB objects.
The entity beans must provide a local interface.
After creating a message-driven bean (MDB) in a new workspace, a developer codes the business logic for the bean. How can the developer proceed to test the function of the MDB? (Assume server configuration is correct and server has started.)
Select the MDB and from it's context menu select Run on Server.
Use the EJB test client to call the onMessage method of the bean.
Use the EJB test client to place a message on the listener port for the MDB.
Develop a Java Client application that uses JMS to place a message on the MDB's destination.
A stateless session bean has a method that invokes a long running multiple step transaction involving a database server. This server is prone to occasional lock timeout errors under heavy load. It is important that these occasional errors rarely cause a transaction to fail. What step can the developer take to help facilitate meeting this requirement?
Delegate the retry responsibility to the client of the session bean.
Break the pieces of the transaction up into logical sub-parts that are retried upon failure.
Retry the transaction whenever it fails.
Retry all parts of the transaction except for the part that causes an error.
Which application design decisions have a NEGATIVE impact on the performance of an IBM WebSphere application?
For each SQL access, obtain JDBC data sources through a JNDI naming lookup.
Use HttpSession objects to only store user profile information and the user's current session state.
Explicitly invalidate the HttpSession object associated with a user when it is no longer needed.
Use System.out.println in servlets to log application specific messages to log files.
Which of the following is NOT a drawback of marking a resource reference to a DataSource in the server configuration as UNSHAREABLE ?
Inefficient use of your connection resources if you have multiple threads using connections to the same database.
Tying up the database resources for a connection when your application is holding a connection but not using it.
If an application is required to perform several different transactions, the same connection cannot be reused.
The possibility of deadlock when multiple threads have connections to the same database and are running concurrently.
A developer uses the IBM WebSphere Trace utility to help resolve a problem which involves transaction interaction within the Services EJB. The developer decides to trace the following packages: com.ibm.ejs.container at an event level and com.ibm.ejs.jts at every level. Which trace specification string will accomplish this level of tracing?
Several customers are complaining that the information being displayed on their browser from a web site contains incorrect information. All of the following are likely causes for this problem EXCEPT:
The configured maximum thread pool size is too small for the current server load.
Customer state data is being stored in the ServletContext.
Incorrect database isolation levels have been set.
Servlet instance variables are being used for customer state data.
Which of the following statements are TRUE regarding using Profiling Filters?
Can be specified at package, class and method levels.
Are used at display time and limit the amount of data presented.
Filters are used at collection time and limit the amount of data analyzed.
Filters set in the Profiling and Logging preferences dialog override filters set for a particular profiling session.
An application function is supported by a stateful session bean. During operation, performance degrades over time. The MOST likely cause for this behavior is that the:
state stored in the stateful session bean is not Serializable.
client is not removing stateful session beans when done with processing.
object cache is configured too large on the application server.
stateful session bean contains no state and is not optimized for that fact.
An existing enterprise application with several web modules has a set of shared utility classes in a JAR file in the root of the corresponding EAR file. A developer
adds a new web module that uses a different version of the utility classes in the WEB-INF/lib folder of the new module. What actions should be taken to ensure that the new web application functions correctly after redeployment?
Set the Classloader mode for the enterprise application to PARENT_LAST.
Set the WAR classloader policy for the enterprise application to MODULE.
Set the WAR classloader policy for the enterprise application to APPLICATION.
Set the Classloader mode for the new web module to PARENT_LAST.
Which of the following is NOT a valid combination of transaction settings?
PatronEJB : Entity EJB
ReceiveMDB : Message-driven bean.
ItemProcessor : Stateful session bean.
a - Required, b - NotSupported, c - Required
a - RequiresNew, b - Required, c - RequiresNew
a - Mandatory, b - NotSupported, c - Required
a - Required, b - Mandatory, c - RequiresNew
a - RequiresNew, b - Required, c - Mandatory
Refer to the exhibit to answer the question. Which categories of EJB might A and B
belong to? Select the BEST match.
Stateless session bean
Stateful session bean
CMP entity bean
BMP entity bean
A. A - 1,2,5 B - 5
B. A - 1,2,3,4 B - 2,5
C. A - 1,3 B - 2,5
D. A - 1,2,3 B - 2
E. A - 2,3 B - 1
A developer needs to create a method on a session bean that in turn calls methods on 3 different entity beans within a single transaction. If any of the method calls fail, the session bean task is considered to have failed and should rollback any changes made by the entity beans. When the entity bean operations fail, they report an exception. What MUST be TRUE to support this behavior?
The session bean is configured with Bean Managed transaction demarcation.
The exceptions thrown by the entity bean methods are checked exceptions.
Each invocation of entity bean behavior is preceded by a call to javax.transaction.UserTransaction.begin().
The entity bean methods are not configured with 'RequiresNew'.
Which of the following statements is TRUE about the Transaction Isolation attribute
in WebSphere Application Server V5.0?
When the "Read committed" isolation level is used, dirty reads are avoided.
For session beans and BMP entity beans, the container generates code that assures the desired level of isolation for each database access.
For entity beans with CMP, the container sets the isolation level at the start of each transaction, and for every database connection.
When the "Read committed" isolation level is used, non-repeatable reads are avoided.
Refer to the exhibit to answer the question. Assuming container-managed transaction demarcation, which statement is FALSE concerning transactions and AccountBean?
An invocation of AccountBean.deposit() outside a transaction will result in a new transaction being created.
An invocation of AccountBean.getBalance() inside a transaction will not result in an Exception.
AccountBean.deposit() can execute outside any transaction scope.
AccountBean.getBalance() can execute outside any transaction scope.
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