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The tomcat connection pooled datasource is registered with spring managed transaction manager in the persistence_postgres.xml
<tx:annotation-driventransaction-manager="openSRPTransactionManager"/>
<beanid="openSRPTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<propertyname="dataSource"ref="openSRPDataSource"/>
</bean>
Spring transaction management can be used to define transactions
To define a method or class as having a transaction or part of a transaction simply annotate the method with @Transactional annotation.
Use the documentation on https://docs.spring.io/spring/docs/3.1.x/spring-framework-reference/html/transaction.html to learn more about spring managed transactions