Begin a transaction. The type of transaction is determined by the setting of the Optimistic flag.
@see #setOptimistic
@see #getOptimistic
@throws JDOUserException if transactions are managed by a containerin the managed environment, or if the transaction is already active.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.