It is a data source (such as a DBMS instance) which participates in a transaction. Configuration is vendor-specific. For a server such as WebLogic: a JDBC datasource factory for use with container-managed EJBs must be configured with a transactional datasource (TXDataSource) rather than a non-transactional datasource (DataSource). With a non-transactional datasource, the JDBC connection operates in auto commit mode, committing each change operation to the database immediately rather than as part of a container-managed transaction.
SCJP 1.4, SCWCD 1.3, SCBCD 1.3
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