HHH-17370 ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment] due to: Cannot invoke org.hibernate.resource.jdbc.spi.JdbcObserver.jdbcConnectionAcquisitionEnd(java.sql.Connection) because this.observer is null

hibernate-core/src/main/java/org/hibernate/engine/jdbc/env/internal/JdbcEnvironmentInitiator.java

@@ -557,6 +557,7 @@ private static class TemporaryJdbcSessionOwner implements JdbcSessionOwner, Jdbc
 		private final boolean connectionProviderDisablesAutoCommit;
 		private final PhysicalConnectionHandlingMode connectionHandlingMode;
 		private final JpaCompliance jpaCompliance;
+		private static final EmptyJdbcObserver EMPTY_JDBC_OBSERVER = EmptyJdbcObserver.INSTANCE;
 		TransactionCoordinator transactionCoordinator;
 
 		public TemporaryJdbcSessionOwner(
@@ -691,7 +692,7 @@ public StatisticsImplementor getStatistics() {
 
 		@Override
 		public JdbcObserver getObserver() {
-			return null;
+			return EMPTY_JDBC_OBSERVER;
 		}
 
 		@Override
@@ -718,5 +719,60 @@ public BatchBuilder getBatchBuilder() {
 		public boolean isActive() {
 			return true;
 		}
+
+		private static class EmptyJdbcObserver implements JdbcObserver{
+
+			public static final EmptyJdbcObserver INSTANCE = new EmptyJdbcObserver();
+
+			@Override
+			public void jdbcConnectionAcquisitionStart() {
+
+			}
+
+			@Override
+			public void jdbcConnectionAcquisitionEnd(Connection connection) {
+
+			}
+
+			@Override
+			public void jdbcConnectionReleaseStart() {
+
+			}
+
+			@Override
+			public void jdbcConnectionReleaseEnd() {
+
+			}
+
+			@Override
+			public void jdbcPrepareStatementStart() {
+
+			}
+
+			@Override
+			public void jdbcPrepareStatementEnd() {
+
+			}
+
+			@Override
+			public void jdbcExecuteStatementStart() {
+
+			}
+
+			@Override
+			public void jdbcExecuteStatementEnd() {
+
+			}
+
+			@Override
+			public void jdbcExecuteBatchStart() {
+
+			}
+
+			@Override
+			public void jdbcExecuteBatchEnd() {
+
+			}
+		}
 	}
 }