diff --git a/hibernate-core/src/test/java/org/hibernate/test/tm/BeforeCompletionFailureTest.java b/hibernate-core/src/test/java/org/hibernate/test/tm/BeforeCompletionFailureTest.java
new file mode 100644
index 0000000000..7ba3969ac3
--- /dev/null
+++ b/hibernate-core/src/test/java/org/hibernate/test/tm/BeforeCompletionFailureTest.java
@@ -0,0 +1,143 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
+ * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
+ */
+package org.hibernate.test.tm;
+
+import java.util.Map;
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.transaction.RollbackException;
+import javax.transaction.Status;
+import javax.transaction.SystemException;
+import javax.transaction.TransactionManager;
+
+import org.hibernate.JDBCException;
+import org.hibernate.Session;
+import org.hibernate.cfg.AvailableSettings;
+import org.hibernate.engine.spi.SessionImplementor;
+
+import org.hibernate.testing.TestForIssue;
+import org.hibernate.testing.jta.TestingJtaBootstrap;
+import org.hibernate.testing.junit4.BaseNonConfigCoreFunctionalTestCase;
+import org.hibernate.test.resource.transaction.jta.JtaPlatformStandardTestingImpl;
+import org.junit.Test;
+
+import org.jboss.logging.Logger;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+/**
+ * @author Steve Ebersole
+ */
+public class BeforeCompletionFailureTest extends BaseNonConfigCoreFunctionalTestCase {
+	private static final Logger log = Logger.getLogger( BeforeCompletionFailureTest.class );
+
+	@Override
+	protected Class[] getAnnotatedClasses() {
+		return new Class[] { SimpleEntity.class };
+	}
+
+	@Override
+	protected void addSettings(Map settings) {
+		super.addSettings( settings );
+		TestingJtaBootstrap.prepare( settings );
+		settings.put( AvailableSettings.TRANSACTION_COORDINATOR_STRATEGY, "jta" );
+	}
+
+	@Test
+	@TestForIssue( jiraKey = "HHH-9888" )
+	public void testUniqueConstraintViolationDuringManagedFlush() throws Exception {
+		// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+		// set up test data
+
+		Session session = openSession();
+		session.getTransaction().begin();
+		session.save( newEntity( 1 ) );
+		session.getTransaction().commit();
+		session.close();
+
+
+		// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+		// do the test
+
+		final TransactionManager tm = JtaPlatformStandardTestingImpl.INSTANCE.transactionManager();
+		assertEquals( Status.STATUS_NO_TRANSACTION, tm.getStatus() );
+
+		// begin the transaction ("CMT" style)
+		tm.begin();
+
+		session = openSession();
+
+		session.save( newEntity( 2 ) );
+
+		// complete the transaction ("CMT" style) - this leads to the managed flush
+		// which should lead to the UK violation
+		try {
+			tm.commit();
+			fail( "Expecting a failure from JTA commit" );
+		}
+		catch (RollbackException expected) {
+			log.info( "Test encountered expected JTA RollbackException; looking for nested JDBCException", expected );
+			boolean violationExceptionFound = false;
+			Throwable cause = expected;
+			while ( cause != null ) {
+				if ( cause instanceof JDBCException ) {
+					log.info( "Found JDBCException, assuming related to UK violation", cause );
+					violationExceptionFound = true;
+					break;
+				}
+				cause = cause.getCause();
+			}
+
+			if ( !violationExceptionFound ) {
+				fail( "Did not find JDBCException in JTA RollbackException chain" );
+			}
+		}
+		finally {
+			if ( !( (SessionImplementor) session ).isClosed() ) {
+				session.close();
+			}
+		}
+
+		// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+		// clean up test data
+
+		session = openSession();
+		session.getTransaction().begin();
+		session.createQuery( "delete SimpleEntity" ).executeUpdate();
+		session.getTransaction().commit();
+		session.close();
+	}
+
+	private SimpleEntity newEntity(int id) {
+		// since "key" is reused, should violate the UK
+		return new SimpleEntity( id, "key", "name" );
+	}
+
+	private void runTest() {
+
+	}
+
+	@Entity(name = "SimpleEntity")
+	public static class SimpleEntity {
+		@Id
+		public Integer id;
+		@Column(unique = true)
+		public String key;
+		public String name;
+
+		public SimpleEntity() {
+		}
+
+		public SimpleEntity(Integer id, String key, String name) {
+			this.id = id;
+			this.key = key;
+			this.name = name;
+		}
+	}
+}