Why are transactions not rolling back when using SpringJUnit4ClassRunner/MySQL/Spring/Hibernate

Question

I am doing unit testing and I expect that all data committed to the MySQL database will be rolled back... but this isn\'t the case. The data is being committed, even though my

Answer 1

The problem turned out to be that the connection was auto-committing BEFORE the transaction could be rolled back. I had to change my dataSource bean to include a defaultAutoCommit property:

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
  <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
  <property name="url" value="jdbc:mysql://localhost:3306/test"/>
  <property name="username" value="root"/>
  <property name="password" value="Ecosim07"/>
  <property name="defaultAutoCommit" value="false" /> 
</bean>

Answer 2

Another way to fix your problem:

Instead of using:

<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>

, which creates a MyISAM table by default, hence not supporting transactions

Try using

<prop key="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</prop>

, which creates InnoDB tables, and thus supports transactions.

Answer 3

This must be used

@TransactionConfiguration(transactionManager = "transactionManager", defaultRollback = true)
@TestExecutionListeners({ TransactionalTestExecutionListener.class })
@Transactional

TransactionalTestExecutionListener contains isRollback() which rollbacks the transaction after the test method.

Answer 4

For me defaultAutoCommit and @Transactional didn't help. I had to change db type to InnoDB

Answer 5

I hope I am right and that this is a simple one. You are missing the @Transactional annotation on your test class. This means that the test method itself isn't run in a transaction and thus there is nothing to roll back. Hope this helps.