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NEW QUESTION: 1
Harry has sued the company claiming they made his personal information public on a social networking site in the United States. The company denies the allegations and consulted a/an ______for legal advice to defend them against this allegation.
A. Evidence Manager
B. Attorney
C. PR Specialist
D. Incident Handler
Answer: B
NEW QUESTION: 2
What are true about the composite structure exhibit? (Choose two)
A. Every instance of Y must be connected to an instance of X.
B. Every instance of X must be connected to an instance of Y.
C. C has at least two properties.
D. All instances corresponding to x and y will be destroyed when an instance of C is
destroyed.
E. C has one part.
Answer: C,E
NEW QUESTION: 3
A developer implements a CMT session bean with a method storeBoth which inserts data both a related database and an LDAP server. The relational database supports transactions while the LDAP system does NOT.
Given that both updates should succeed or be rolled back, while is the best solution?
A. Define the transaction attribute of the method storeBoth as REQUIRED. The container manages the transactions and will roll back modifications if something goes wrong in either database insert or LDAP insert.
B. Define the transaction attribute of the method storeBoth as REQUIRED_NEW. Carry out the LDAP insert first. If SessionContext.getRollBackOnly returns false, execute the database inserts, catching SQL exceptions. If exceptions are raised, call the SessionContext.setRollBackOnly.
C. Implement the SessionSynchoronization interface in the session bean. In the afterCompleteion method, the LDAP inserts are rolled back if false is passed as an argument to the afterCompletion method.
D. Define the transaction attribute of the method storeBoth as REQUIRED_NEW. Carry out the database insert first. Subsequently, execute the LDAP inserts, catching LDAP exceptions. If exceptions are raised, call the SessionContext.setRollBackOnly method.
Answer: D
Explanation:
The method should start a new transaction, so we use theREQUIRED_NEWattribute.
For the LDAP operation we can only detect LDAP exceptions. We cannot check the status of the LDAP operation throughSessionContext.getRollBackOnly.
Note:
* CMT -Container-Managed Transactions *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. Reference:The Java EE 5 Tutorial,Container-Managed Transactions