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Question 58/90
A developer writes a Singleton bean that uses the java Persistence API within a business method:
Two different concurrently executing caller threads acquire an EJB reference to PersonBean and each invoke the getPerson () method one time. How many distinct transaction are used to process the caller invocations?
Two different concurrently executing caller threads acquire an EJB reference to PersonBean and each invoke the getPerson () method one time. How many distinct transaction are used to process the caller invocations?
Correct Answer: B
Explanation/Reference:
Only one transaction is required. LockType READ allows simultaneous access to singleton beans.
Note: READ
public static final LockType READ
For read-only operations. Allows simultaneous access to methods designated as READ, as long as no WRITE lock is held.
Reference: javax.ejb, Enum LockType
Only one transaction is required. LockType READ allows simultaneous access to singleton beans.
Note: READ
public static final LockType READ
For read-only operations. Allows simultaneous access to methods designated as READ, as long as no WRITE lock is held.
Reference: javax.ejb, Enum LockType
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