_posts/2010-03-10-example_testing_transaction_rollback.html

---
layout: post
status: PUBLISHED
published: true
title: 'Example: Testing Transaction Rollback'
id: ee166a75-3b4b-48be-bf51-5a1d916f76dd
date: '2010-03-10 13:00:00 -0500'
categories: openejb
tags:
- junit
- applicationexception
- rollback
- transactions
- ejb3
- openejb
- testing
permalink: openejb/entry/example_testing_transaction_rollback
---
<p>We've coded up a nice little <a href="http://svn.apache.org/repos/asf/openejb/trunk/openejb3/examples/transaction-rollback/">example project</a> that shows various ways to rollback transactions in unit tests.</p>
<p/>
The example also serves to show the various options in EJB that pertain to how to rollback transactions via either a UserTransaction, SessionContext.setRollbackOnly(), or throwing a RuntimeException.  The example also shows how to mark a RuntimeException with @ApplicationException to bypass the rollback behavior.</p>
<p/>
Here's a snippet from the test case to show how simple it is to test:</p>
<p/>
<pre>
/**
 * Transaction is marked for rollback inside the bean via
 * calling the javax.ejb.SessionContext.setRollbackOnly() method
 *
 * This is the cleanest way to make a transaction rollback.
 */
public void testMarkedRollback() throws Exception {

    userTransaction.begin();

    try {
        entityManager.persist(new Movie("Quentin Tarantino", "Reservoir Dogs", 1992));
        entityManager.persist(new Movie("Joel Coen", "Fargo", 1996));
        entityManager.persist(new Movie("Joel Coen", "The Big Lebowski", 1998));

        List<Movie> list = movies.getMovies();
        assertEquals("List.size()", 3, list.size());

        movies.callSetRollbackOnly();
    } finally {
        try {
            userTransaction.commit();
            fail("A RollbackException should have been thrown");
        } catch (RollbackException e) {
            // Pass
        }
    }

    // Transaction was rolled back
    List<Movie> list = movies.getMovies();
    assertEquals("List.size()", 0, list.size());

}
</pre>