Fix connection leak through connection validation code

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

@@ -551,7 +551,7 @@ public PooledConnections build() {
 		}
 	}
 
-	private static class PoolState {
+	private static class PoolState implements Runnable {
 
 		//Protecting any lifecycle state change:
 		private final ReadWriteLock statelock = new ReentrantReadWriteLock();
@@ -577,7 +577,7 @@ private void startIfNeeded() {
 				}
 				executorService = Executors.newSingleThreadScheduledExecutor( new ValidationThreadFactory() );
 				executorService.scheduleWithFixedDelay(
-						pool::validate,
+						this,
 						validationInterval,
 						validationInterval,
 						TimeUnit.SECONDS
@@ -589,6 +589,13 @@ private void startIfNeeded() {
 			}
 		}
 
+		@Override
+		public void run() {
+			if ( active ) {
+				pool.validate();
+			}
+		}
+
 		public void stop() {
 			statelock.writeLock().lock();
 			try {

hibernate-core/src/main/java/org/hibernate/metamodel/model/convert/internal/OrdinalEnumValueConverter.java

@@ -60,10 +60,7 @@ public Integer toRelationalValue(E domainForm) {
 
 	@Override
 	public int getJdbcTypeCode() {
-		// note, even though we convert the enum to
-		// an Integer here, we actually map it to a
-		// database column of type TINYINT by default
-		return Types.TINYINT;
+		return jdbcType.getJdbcTypeCode();
 	}
 
 	@Override

hibernate-testing/src/main/java/org/hibernate/testing/jdbc/SharedDriverManagerConnectionProviderImpl.java

@@ -74,7 +74,6 @@ public void stop() {
 
 	public void reset() {
 		super.stop();
-		config = null;
 	}
 
 	private static class Config {