HHH-13936 Call pulseTransactionCoordinator before checking for transaction in flush()

(cherry picked from commit 585ca8e)

Author: michiel.hendriks

hibernate-core/src/main/java/org/hibernate/internal/SessionImpl.java

@@ -1459,8 +1459,8 @@ public void flush() throws HibernateException {
 	}
 
 	private void doFlush() {
-		checkTransactionNeededForUpdateOperation();
 		pulseTransactionCoordinator();
+		checkTransactionNeededForUpdateOperation();
 
 		try {
 			if ( persistenceContext.getCascadeLevel() > 0 ) {

hibernate-core/src/test/java/org/hibernate/test/flush/TestFlushJoinTransaction.java

@@ -0,0 +1,68 @@
+/*
+ * 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.flush;
+
+import java.util.Map;
+
+import javax.persistence.TransactionRequiredException;
+
+import org.hibernate.Session;
+import org.hibernate.cfg.AvailableSettings;
+import org.junit.Assert;
+import org.junit.Test;
+
+import org.hibernate.testing.TestForIssue;
+import org.hibernate.testing.jta.TestingJtaBootstrap;
+import org.hibernate.testing.jta.TestingJtaPlatformImpl;
+import org.hibernate.testing.junit4.BaseNonConfigCoreFunctionalTestCase;
+
+/**
+ * @author Michiel Hendriks
+ */
+@TestForIssue(jiraKey = "HHH-13936")
+public class TestFlushJoinTransaction extends BaseNonConfigCoreFunctionalTestCase {
+
+	@Override
+	protected void addSettings(Map settings) {
+		super.addSettings( settings );
+		TestingJtaBootstrap.prepare( settings );
+		settings.put( AvailableSettings.TRANSACTION_COORDINATOR_STRATEGY, "jta" );
+	}
+	
+	@Test
+	public void testFlush() throws Exception {
+		Session session = openSession();
+		try {
+			TestingJtaPlatformImpl.INSTANCE.getTransactionManager().begin();
+			session.flush();
+			TestingJtaPlatformImpl.INSTANCE.getTransactionManager().commit();
+		}
+		catch (TransactionRequiredException e) {
+			Assert.fail("No TransactionRequiredException expected.");
+		}
+		finally {
+			session.close();
+		}
+	}
+	
+	@Test
+	public void testIsConnectedFlush() throws Exception {
+		Session session = openSession();
+		try {
+			TestingJtaPlatformImpl.INSTANCE.getTransactionManager().begin();
+			session.isConnected();
+			session.flush();
+			TestingJtaPlatformImpl.INSTANCE.getTransactionManager().commit();
+		}
+		catch (TransactionRequiredException e) {
+			Assert.fail("No TransactionRequiredException expected.");
+		}
+		finally {
+			session.close();
+		}
+	}
+}