spring template objects

*JMS -- a template instance is a jms session
** anon inner class

*JDBC -- a template instance is a database connection
** callback -- an anon inner class

*hibernate -- a template instance is a hibernate Session

*transaction -- a template instance is a ... transaction session?
** callback -- an anon inner class

Spring Templates follow template-method design pattern. The callback objects provide the missing steps int the template method.

tx mgr in spring -- 4 main types

JmsTransactionManager

HibernateTransactionManager
JdoTransactionManager
DataSourceTransactionManager