HHH-18216 add StatelessSession.getIdentifier()

Signed-off-by: Gavin King <gavin@hibernate.org>

hibernate-core/src/main/java/org/hibernate/StatelessSession.java

@@ -286,4 +286,15 @@ public interface StatelessSession extends SharedSessionContract {
 	 * @since 6.0
 	 */
 	void fetch(Object association);
+
+	/**
+	 * Return the identifier value of the given entity, which may be detached.
+	 *
+	 * @param entity a persistent instance associated with this session
+	 *
+	 * @return the identifier
+	 *
+	 * @since 6.6
+	 */
+	Object getIdentifier(Object entity);
 }

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

@@ -769,6 +769,12 @@ public class StatelessSessionImpl extends AbstractSharedSessionContract implemen
 		}
 	}
 
+	@Override
+	public Object getIdentifier(Object entity) throws HibernateException {
+		checkOpen();
+		return getFactory().getPersistenceUnitUtil().getIdentifier(entity);
+	}
+
 	@Override
 	public boolean isAutoCloseSessionEnabled() {
 		return getFactory().getSessionFactoryOptions().isAutoCloseSessionEnabled();

tooling/metamodel-generator/src/main/java/org/hibernate/processor/annotation/LifecycleMethod.java

@@ -136,7 +136,7 @@ public class LifecycleMethod extends AbstractAnnotatedMethod {
 				declaration
 						.append("\t\tif (")
 						.append(sessionName)
-						.append(".getFactory().getPersistenceUnitUtil().getIdentifier(")
+						.append(".getIdentifier(")
 						.append(iterateParameter ? "_entity" : parameterName)
 						.append(") == null)\n")
 						.append("\t\t\t")