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    <blockquote> <p>Is there any framework which just rollback all the transactions after each test finished so every test will have fresh/same DB data to Test. And this way after all Test executions, data of DB schema would be as it is.</p> </blockquote> <p>From <a href="https://stackoverflow.com/questions/6936845/clear-the-in-memory-database-after-every-testcase/6936962#6936962">my other answer</a> posted earlier in the day, yes, this is possible using DbUnit. (Based on your edit, you don't need this; the subsequent section of my answer addresses why I use DbUnit, and when I wouldn't use it).</p> <p>The following code snippet demonstrates how the setup of every test is performed:</p> <pre><code>@Before public void setUp() throws Exception { logger.info("Performing the setup of test {}", testName.getMethodName()); IDatabaseConnection connection = null; try { connection = getConnection(); IDataSet dataSet = getDataSet(); //The following line cleans up all DbUnit recognized tables and inserts and test data before every test. DatabaseOperation.CLEAN_INSERT.execute(connection, dataSet); } finally { // Closes the connection as the persistence layer gets it's connection from elsewhere connection.close(); } } private IDatabaseConnection getConnection() throws Exception { @SuppressWarnings({ "rawtypes", "unused" }) Class driverClass = Class.forName("org.apache.derby.jdbc.ClientDriver"); Connection jdbcConnection = DriverManager.getConnection(jdbcURL, "XXX", "YYY"); IDatabaseConnection databaseConnection = new DatabaseConnection(jdbcConnection); return databaseConnection; } private IDataSet getDataSet() throws Exception { ClassLoader classLoader = this.getClass().getClassLoader(); return new FlatXmlDataSetBuilder().build(classLoader.getResourceAsStream("database-test-setup.xml")); } </code></pre> <p>The <code>database-test-setup.xml</code> file contains the data that will be inserted into the database for every test. The use of <code>DatabaseOperation.CLEAN_INSERT</code> in the <code>setup</code> method ensures that all the tables specified in the file will be cleared (by a delete of all rows) followed by an insert of the specified data in the test data file.</p> <p><strong>Avoiding DbUnit</strong></p> <p>I use the above approach specifically to clear out sequences before the start of every test, as the application uses a JPA provider which updates the sequences in a separate transaction. If your application is not doing anything like that, then you can afford to simply start a transaction in your <code>setup()</code> method and issue a rollback on teardown after the test. If my application didn't use sequences (and if I didn't desire to reset them), then my setup routine would have been as simple as:</p> <pre><code>@Before public void setUp() throws Exception { logger.info("Performing the setup of test {}", testName.getMethodName()); // emf is created in the @BeforeClass annotated method em = emf.createEntityManager(); // Starts the transaction before every test em.getTransaction.begin(); } @After public void tearDown() throws Exception { logger.info("Performing the teardown of test {}", testName.getMethodName()); if (em != null) { // Rolls back the transaction after every test em.getTransaction().rollback(); em.close(); } } </code></pre> <p>Also, I use <a href="http://dbdeploy.com/" rel="nofollow noreferrer">dbdeploy</a> with Maven, but that is primarily for keeping the test database up to date with the versioned data model.</p>
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    1. COThanks for reply, its really very helpful but I think with the first approach(DbUnit) there is overhead of Data Insertion as its done for every test during setup() so For example there can be many tests where we need data from a one/two tables but every time setup() will insert data for all the tables.
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    2. COI think second approach(Transaction) would not save Data in DB (its not doing actual persistence of data) so DB won't throw Constraint violation exceptions and it doesn't seem proper testing for all scenarios. Please let me know if I am wrong in this.
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    3. CO@SmartSolution, you can always have separate XML files for the each fixture. Of course, if each test within the fixture requires only a portion of the data and if this is an overhead, then I would suggest using the [Testcase Class per Fixture pattern](http://xunitpatterns.com/Testcase%20Class%20per%20Fixture.html). On the topic of constraint violations and exceptions thrown, Persistence exceptions will be thrown when you flush the PersistenceContext and not on COMMIT as far as I know.
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