HHH-12921 - Hibernate Connection Pool Validation Thread should be defined as a daemon Thread

HHH-12922 - Hibernate Connection Pool Validation Thread should have a name

hibernate-core/src/main/java/org/hibernate/engine/jdbc/connections/internal/DriverManagerConnectionProviderImpl.java

@@ -14,6 +14,7 @@ import java.util.Properties;
 import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.locks.ReadWriteLock;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
@@ -384,14 +385,9 @@ public class DriverManagerConnectionProviderImpl
 				if ( active ) {
 					return;
 				}
-				executorService = Executors.newSingleThreadScheduledExecutor();
+				executorService = Executors.newSingleThreadScheduledExecutor( new ValidationThreadFactory() );
 				executorService.scheduleWithFixedDelay(
-						new Runnable() {
-							@Override
-							public void run() {
-								pool.validate();
-							}
-						},
+						pool::validate,
 						validationInterval,
 						validationInterval,
 						TimeUnit.SECONDS
@@ -453,4 +449,15 @@ public class DriverManagerConnectionProviderImpl
 		}
 	}
 
+	private static class ValidationThreadFactory implements ThreadFactory {
+
+		@Override
+		public Thread newThread(Runnable runnable) {
+			Thread thread = new Thread( runnable );
+			thread.setDaemon( true );
+			thread.setName( "Hibernate Connection Pool Validation Thread" );
+			return thread;
+		}
+	}
+
 }

hibernate-core/src/test/java/org/hibernate/connection/DriverManagerConnectionProviderValidationConfigTest.java

@@ -0,0 +1,65 @@
+/*
+ * 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.connection;
+
+import java.util.Map;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+import org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl;
+import org.hibernate.jpa.test.BaseEntityManagerFunctionalTestCase;
+
+import org.junit.Test;
+
+import static org.hibernate.testing.transaction.TransactionUtil.doInJPA;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * @author Vlad Mihalcea
+ */
+public class DriverManagerConnectionProviderValidationConfigTest extends BaseEntityManagerFunctionalTestCase {
+
+	@Override
+	protected Class<?>[] getAnnotatedClasses() {
+		return new Class<?>[] {
+				Event.class
+		};
+	}
+
+	@Override
+	protected void addConfigOptions(Map options) {
+		options.put( DriverManagerConnectionProviderImpl.VALIDATION_INTERVAL, 1L );
+	}
+
+	@Test
+	public void test() {
+		doInJPA( this::entityManagerFactory, entityManager -> {
+			Event event = new Event();
+			entityManager.persist( event );
+
+			assertTrue( Thread.getAllStackTraces()
+								.keySet()
+								.stream()
+								.filter( thread -> thread.getName()
+										.equals( "Hibernate Connection Pool Validation Thread" ) && thread.isDaemon() )
+								.map( Thread::isDaemon )
+								.findAny()
+								.isPresent() );
+		} );
+	}
+
+	@Entity(name = "Event")
+	public static class Event {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		private String name;
+	}
+}