org.springframework.dao.DataIntegrityViolationException: Could not execute JDBC batch update; nested exception is org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
  at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:622)
  at org.springframework.orm.hibernate3.HibernateTransactionManager.convertHibernateAccessException(HibernateTransactionManager.java:690)
  at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:566)
  at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:662)
  at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:632)
  at org.springframework.test.context.transaction.TransactionalTestExecutionListener.endTransaction(TransactionalTestExecutionListener.java:346)
  at org.springframework.test.context.transaction.TransactionalTestExecutionListener.afterTestMethod(TransactionalTestExecutionListener.java:199)
  at org.springframework.test.context.TestContextManager.afterTestMethod(TestContextManager.java:340)
  at org.springframework.test.context.junit4.SpringMethodRoadie.runAfters(SpringMethodRoadie.java:351)
  at org.springframework.test.context.junit4.SpringMethodRoadie.runBeforesThenTestThenAfters(SpringMethodRoadie.java:262)
  at org.springframework.test.context.junit4.SpringMethodRoadie.runWithRepetitions(SpringMethodRoadie.java:234)
  at org.springframework.test.context.junit4.SpringMethodRoadie.runTest(SpringMethodRoadie.java:204)
  at org.springframework.test.context.junit4.SpringMethodRoadie.run(SpringMethodRoadie.java:146)
  at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.invokeTestMethod(SpringJUnit4ClassRunner.java:151)
  at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
  at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
  at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
  at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
  at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
  at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:38)
  at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
  at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71)
  at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
  at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:253)
  at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:237)
  at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:146)
  at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
  at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
  at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
  at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
  at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
  at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:558)
  ... 22 more
Caused by: java.sql.BatchUpdateException: Cannot delete or update a parent row: a foreign key constraint fails (`obs/test_test`, CONSTRAINT `FK5C8CE6BFAAF990FE` FOREIGN KEY (`relatedtests_id`) REFERENCES `test` (`id`))
  at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1213)
  at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:912)
  at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:297)
  at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:48)
  at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:246)
  ... 30 more

@Entity
public class Test implements Serializable {

  private static final long serialVersionUID = 1L;

  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private Long id;

  @ManyToMany
  private Set<Test> relatedTests;

  public Long getId() {
    return id;
  }

  public void setId(Long id) {
    this.id = id;
  }

  public Set<Test> getRelatedTests() {
    if (relatedTests == null) relatedTests = new HashSet<Test>();
    return relatedTests;
  }

  public void setRelatedTests(Set<Test> relatedTests) {
    this.relatedTests = relatedTests;
  }

  public void addRelatedTest(Test test) {
    if (getRelatedTests().add(test)) test.getRelatedTests().add(this);
  }

  public void removeRelatedTest(Test test) {
    if (getRelatedTests().remove(test)) test.getRelatedTests().remove(this);
  }

  @Override
  public boolean equals(final Object other) {
    if (!(other instanceof Test)) return false;
    Test castOther = (Test) other;
    return new EqualsBuilder().append(id, castOther.id).isEquals();
  }

  @Override
  public int hashCode() {
    return new HashCodeBuilder().append(id).toHashCode();
  }

}

[...]
@Test
@Rollback(false)
public void createTest() {
  Test t1 = new Test();
  genericDao.saveOrUpdate(t1);

  Test t2 = new Test();
  genericDao.saveOrUpdate(t2);

  t1.addRelatedTest(t2);

  genericDao.saveOrUpdate(t1);
}

@Test
@Rollback(false)
public void deleteTest() {
  Test test = genericDao.findAll(Test.class).get(0);
  genericDao.delete(test);
}
[...]

public class TestInterceptor extends EmptyInterceptor {

  @Override
  public void onDelete(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) {
    if (entity instanceof Test) {
      Test test = (Test) entity;
      for (Test related : test.getRelatedTests()) {
        test.removeRelatedTest(related);
      }
    }
  }

}