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NEW QUESTION: 1
Scenario:

























































A. Option C
B. Option D
C. Option B
D. Option A
Answer: B
Explanation:
Explanation
As per R3

NEW QUESTION: 2
A developer implements a system in which transfers of goods are monitored. Each transfer needs a unique ID for tracking purposes. The unique ID is generated by an existing system which is also used by other applications. For performance reasons, the transaction that gets the unique ID should be as short as possible. The scenario is implemented in four steps which are implemented in four business methods in a CMT session bean:

These methods are called by the addTransfer method of a second CMT session bean in the following order:
checkGooods, getUniqueId, checkAmount, storeTranfer
Assuming no other transaction-related metadata, which is the correct set of transaction attributes for the methods in the session beans?
A. 0.addTransferREQUIRED 1.checkGoodsREQUIRED 2.getUnigueIdREQUIRED 3.checkAmountsREQUIRED 4.storeTransferREQUIRED
B. 0.addTransferREQUIRED
1.checkGoodsREQUIRED 2.getUnigueIdREQUIRES_NEW 3.checkAmountsNOT_SUPPORTED 4.storeTransferMANDATORY
C. 0.addTransferNOT_SUPPORTED 1.checkGoodsREQUIRED 2.getUnigueIdREQUIRES_NEW 3.checkAmountsNOT_SUPPORTED 4.storeTransferMANDATORY
D. 0.addTransferREQUIRED 1.checkGoodsREQUIRED 2.getUnigueIdREQUIRES_NEW 3.checkAmountsNEVER 4.storeTransferMANDATORY
Answer: C
Explanation:
Step 2: Must start a new transaction. use REQUIRES_NEW
Step 3: No need for this step: use Not Supported
Use the NotSupported attribute for methods that don't need transactions. Because transactions
involve overhead, this attribute may improve performance.
Step 4: Use Mandatory:
Use the Mandatory attribute if the enterprise bean's method must use the transaction of the client.
Note:
*In an enterprise bean with container-managed transaction(CMT)demarcation, the EJB container
sets the boundaries of the transactions. You can use container-managed transactions with any
type of enterprise bean: session, or message-driven. Container-managed transactions simplify
development because the enterprise bean code does not explicitly mark the transaction's
boundaries. The code does not include statements that begin and end the transaction.
*A transaction attribute can have one of the following values:
Required RequiresNew Mandatory NotSupported Supports Never *Required Attribute
If the client is running within a transaction and invokes the enterprise bean's method, the method executes within the client's transaction. If the client is not associated with a transaction, the container starts a new transaction before running the method.
The Required attribute is the implicit transaction attribute for all enterprise bean methods running with container-managed transaction demarcation. You typically do not set the Required attribute unless you need to override another transaction attribute. Because transaction attributes are declarative, you can easily change them later.
*RequiresNew Attribute If the client is running within a transaction and invokes the enterprise bean's method, the container takes the following steps:
Suspends the client's transaction Starts a new transaction Delegates the call to the method Resumes the client's transaction after the method completes If the client is not associated with a transaction, the container starts a new transaction before
running the method.
You should use the RequiresNew attribute when you want to ensure that the method always runs within a new transaction. *Mandatory Attribute
If the client is running within a transaction and invokes the enterprise bean's method, the method executes within the client's transaction. If the client is not associated with a transaction, the container throws the TransactionRequiredException.
Use the Mandatory attribute if the enterprise bean's method must use the transaction of the client.
*NotSupported Attribute If the client is running within a transaction and invokes the enterprise bean's method, the container suspends the client's transaction before invoking the method. After the method has completed, the container resumes the client's transaction.
If the client is not associated with a transaction, the container does not start a new transaction before running the method.
Use the NotSupported attribute for methods that don't need transactions. Because transactions involve overhead, this attribute may improve performance.
Reference:The Java EE 5 Tutorial,Container-Managed Transactions

NEW QUESTION: 3
Control Charts were developed by Dr. Shewhart to track data over time. To detect Special Cause variation the Control Charts use which of these?
A. Center Line and Control Limits
B. Data shift analysis
C. None of the above
D. Outlier analysis methods
Answer: A