What is UserTransaction in Java?
What is UserTransaction in Java?
The UserTransaction interface defines the methods that allow an application to explicitly manage transaction boundaries. Method Summary. void. begin() Create a new transaction and associate it with the current thread.
Which case of a session bean obtains the UserTransaction?
Bean-managed transactions obtains UserTransaction object via EJBContext using getUserTransaction() method.
What is transaction in EJB?
A transaction is a single unit of work items, which follows the ACID properties. ACID stands for Atomic, Consistent, Isolated, and Durable. Atomic − If any of the work item fails, the whole unit will be considered failed.
What is container managed transaction?
Container managed transactions are considered the place where the container (JEE Server) controls the boundaries of the transactions, when to begin, when to commit or to rollback.
What is transaction in SQL Server with example?
A transaction is the propagation of one or more changes to the database. For example, if you are creating a record or updating a record or deleting a record from the table, then you are performing a transaction on that table.
Which of the following are not a container for EJB?
E Internet information server and tomcat are not container for EJB.
Which session bean does the conversational state between multiple method calls is not maintained by the container?
Stateless Session Bean does the conversational state between multiple method calls – EJB. Q.
How many types of beans are there in EJB?
three types
There are three types of enterprise beans, entity beans, session beans, and message-driven beans. All beans reside in Enterprise JavaBeans (EJB) containers, which provide an interface between the beans and the application server on which they reside.
What is a session bean in EJB?
A session bean is an EJB 3.0 or EJB 2.1 enterprise bean component created by a client for the duration of a single client/server session. A session bean performs operations for the client. Although a session bean can be transactional, it is not recoverable should a system failure occur.
How do I rollback a container managed EJB transaction?
There are two ways to roll back a container-managed transaction. First, if a system exception is thrown, the container will automatically roll back the transaction. Second, by invoking the setRollbackOnly method of the EJBContext interface, the bean method instructs the container to roll back the transaction.
How many types of transactions are there in SQL?
SQL Server can operate 3 different transactions modes and these are: Auto-commit transactions. Implicit transactions. Explicit transactions.
What is ROLLBACK and COMMIT?
Basics/Definition. The COMMIT statement lets a user save any changes or alterations on the current transaction. These changes then remain permanent. The ROLLBACK statement lets a user undo all the alterations and changes that occurred on the current transaction after the last COMMIT.