HHH-12923 Hibernate is both logging and throwing the error: HHH000346:Error during managed flush

orm/hibernate-orm-5/src/test/java/org/hibernate/bugs/JPAUnitTestCase.java

@@ -3,10 +3,14 @@
 import javax.persistence.EntityManager;
 import javax.persistence.EntityManagerFactory;
 import javax.persistence.Persistence;
+import javax.persistence.RollbackException;
 
+import org.hibernate.bugs.constraint.violation.Event;
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.rules.ExpectedException;
 
 /**
  * This template demonstrates how to develop a test case for Hibernate ORM, using the Java Persistence API.
@@ -25,14 +29,31 @@ public void destroy() {
 		entityManagerFactory.close();
 	}
 
-	// Entities are auto-discovered, so just add them anywhere on class-path
-	// Add your tests, using standard JUnit.
+	@Rule
+    public ExpectedException exception = ExpectedException.none();
+
 	@Test
-	public void hhh123Test() throws Exception {
+	public void hhh12923test() throws Exception {
+		// Expecting a rollback exception here because Hibernate only realizes that we are violating a constraint while committing 
+		// i.e. after inserting 2 identical rows. So it throws a RollbackException which is caused by ConstraintViolationException. 
+		exception.expect(RollbackException.class);
+
 		EntityManager entityManager = entityManagerFactory.createEntityManager();
 		entityManager.getTransaction().begin();
-		// Do stuff...
+
+		Event event1 = new Event("Concert", "Overland Park");
+		Event event2 = new Event("Concert", "Overland Park");
+
+		entityManager.persist(event1);
+		System.out.println("Event 1 persisted.");
+		entityManager.persist(event2);
+		System.out.println("Event 2 persisted.");
+
 		entityManager.getTransaction().commit();
+
+		// The below message is never printed because the commit above is not successful.
+		System.out.println("Committed");
+
 		entityManager.close();
 	}
 }

orm/hibernate-orm-5/src/test/java/org/hibernate/bugs/constraint/violation/Event.java

@@ -0,0 +1,39 @@
+package org.hibernate.bugs.constraint.violation;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.Table;
+import javax.persistence.UniqueConstraint;
+
+/**
+ * 
+ * @author Vydruth Pulluri
+ * @author Shelley J. Baker
+ * 
+ */
+@Table(name = "events_table", uniqueConstraints = { @UniqueConstraint(name = "uq1_event", columnNames = { "location", "display_name" }) })
+@Entity
+public class Event {
+
+	/** Unique auto genetared id */
+	@Id
+	@GeneratedValue
+	private Long id;
+
+	/** Display name of the event */
+	@Column(name = "display_name", nullable = false)
+	private String displayName;
+
+	/** Location where the event is happening */ 
+	@Column(name = "location", nullable = false)
+	private String location;
+
+	public Event() {}
+
+	public Event(String displayName, String location) {
+		this.displayName = displayName;
+		this.location = location;
+	}
+}