<hibernate-mapping>
    <class
        name="User"
        table="User"
        dynamic-update="false"
        dynamic-insert="false"
    >
        <id
            name="username"
            column="username"
            type="java.lang.String"
            length="32"
            unsaved-value="null"
        >
            <generator class="assigned">
            </generator>
        </id>
        <many-to-one
            name="company"
            class="Company"
            cascade="none"
            outer-join="auto"
            update="true"
            insert="true"
            access="property"
            column="id"
        />
    </class>
</hibernate-mapping>

<hibernate-mapping>
    <class
        name="Company"
        table="Company"
        dynamic-update="false"
        dynamic-insert="false"
    >
        <id
            name="id"
            column="id"
            type="java.lang.Long"
            unsaved-value="null"
        >
            <generator class="native">
            </generator>
        </id>
        <bag
            name="users"
            lazy="true"
            inverse="true"
            cascade="save-update"
        >
              <key
                  column="id"
              >
              </key>
              <one-to-many
                  class="User"
              />
        </bag>
    </class>
</hibernate-mapping>

    [junit] ERROR [main] SessionImpl.execute(2379) | Could not synchronize database state with session
    [junit] net.sf.hibernate.HibernateException: Batch update row count wrong: 0
    [junit] at net.sf.hibernate.impl.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:65)
    [junit] at net.sf.hibernate.impl.BatcherImpl.executeBatch(BatcherImpl.java:126)
    [junit] at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2421)
    [junit] at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2372)
    [junit] at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2240)
    [junit] at UserDAOTest.tearDown(UserDAOTest.java:50)
    [junit] at junit.framework.TestCase.runBare(TestCase.java:130)
    [junit] at junit.framework.TestResult$1.protect(TestResult.java:106)
    [junit] at junit.framework.TestResult.runProtected(TestResult.java:124)
    [junit] at junit.framework.TestResult.run(TestResult.java:109)
    [junit] at junit.framework.TestCase.run(TestCase.java:118)
    [junit] at junit.framework.TestSuite.runTest(TestSuite.java:208)
    [junit] at junit.framework.TestSuite.run(TestSuite.java:203)
    [junit] at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:289)
    [junit] at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:656)
    [junit] at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:558)
    [junit] Testsuite: UserDAOTest
    [junit] Tests run: 6, Failures: 0, Errors: 1, Time elapsed: 0.265 sec
    [junit] Testcase: testSaveUser(UserDAOTest):   Caused an ERROR
    [junit] Batch update row count wrong: 0
    [junit] net.sf.hibernate.HibernateException: Batch update row count wrong: 0
    [junit] at net.sf.hibernate.impl.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:65)
    [junit] at net.sf.hibernate.impl.BatcherImpl.executeBatch(BatcherImpl.java:126)
    [junit] at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2421)
    [junit] at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2372)
    [junit] at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2240)
    [junit] at UserDAOTest.tearDown(UserDAOTest.java:50)
    [junit] Test UserDAOTest FAILED

   public class Company {
      private Long id;
      private List users = new ArrayList();

      // ... Getters/Setters ...

      // Additional class to add user to company
      public void addUser(User user) {
         user.setCompany(this);
         users.add(user);
      }
   }

   public class User {
      private String username;
      private Company company;

      // ... Getters/Setters ...
   }

   public class UserDAOTest {
      private UserDAO userDAO = null;
      
      public void testSaveUser() throws Exception {
         Company company = new Company();

         User user = new User();
         user.setUsername("junit");

         company.addUser(user);
         userDAO.saveCompany(company);

         assertNotNull(company.getId());
      }
   }

   public class UserDAO {
      public Company saveCompany(Company company) throws DAOException {
         int count =
            ((Integer) getHibernateTemplate()
               .find("select count(*) from Company c where c.id=?", company.getId()).iterator()
               .next()).intValue();
         
         if (count == 0) {
            getHibernateTemplate().save(company);
         } else {
            getHibernateTemplate().saveOrUpdate(company);
         }

         return company;
      }
   }