Add Hibernate StatelessSession support

extensions/hibernate-orm/deployment/src/main/java/io/quarkus/hibernate/orm/deployment/ClassNames.java

@@ -51,6 +51,7 @@ private static DotName createConstant(String fqcn) {
     public static final DotName SESSION_FACTORY = createConstant("org.hibernate.SessionFactory");
     public static final DotName ENTITY_MANAGER = createConstant("jakarta.persistence.EntityManager");
     public static final DotName SESSION = createConstant("org.hibernate.Session");
+    public static final DotName STATELESS_SESSION = createConstant("org.hibernate.StatelessSession");
 
     public static final DotName INTERCEPTOR = createConstant("org.hibernate.Interceptor");
     public static final DotName STATEMENT_INSPECTOR = createConstant("org.hibernate.resource.jdbc.spi.StatementInspector");

extensions/hibernate-orm/deployment/src/main/java/io/quarkus/hibernate/orm/deployment/HibernateOrmCdiProcessor.java

@@ -11,6 +11,7 @@
 
 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
+import org.hibernate.StatelessSession;
 import org.jboss.jandex.AnnotationTarget.Kind;
 import org.jboss.jandex.AnnotationValue;
 import org.jboss.jandex.ClassType;
@@ -47,6 +48,7 @@ public class HibernateOrmCdiProcessor {
     private static final List<DotName> SESSION_FACTORY_EXPOSED_TYPES = Arrays.asList(ClassNames.ENTITY_MANAGER_FACTORY,
             ClassNames.SESSION_FACTORY);
     private static final List<DotName> SESSION_EXPOSED_TYPES = Arrays.asList(ClassNames.ENTITY_MANAGER, ClassNames.SESSION);
+    private static final List<DotName> STATELESS_SESSION_EXPOSED_TYPES = List.of(ClassNames.STATELESS_SESSION);
 
     private static final Set<DotName> PERSISTENCE_UNIT_EXTENSION_VALID_TYPES = Set.of(
             ClassNames.TENANT_RESOLVER,
@@ -148,6 +150,15 @@ void generateDataSourceBeans(HibernateOrmRecorder recorder,
                                 .createWith(recorder.sessionSupplier(persistenceUnitName))
                                 .addInjectionPoint(ClassType.create(DotName.createSimple(TransactionSessions.class)))
                                 .done());
+
+                // same for StatelessSession
+                syntheticBeanBuildItemBuildProducer
+                        .produce(createSyntheticBean(persistenceUnitName,
+                                true, true,
+                                StatelessSession.class, STATELESS_SESSION_EXPOSED_TYPES, false)
+                                .createWith(recorder.statelessSessionSupplier(persistenceUnitName))
+                                .addInjectionPoint(ClassType.create(DotName.createSimple(TransactionSessions.class)))
+                                .done());
             }
             return;
         }
@@ -179,6 +190,15 @@ void generateDataSourceBeans(HibernateOrmRecorder recorder,
                                 .createWith(recorder.sessionSupplier(persistenceUnitName))
                                 .addInjectionPoint(ClassType.create(DotName.createSimple(TransactionSessions.class)))
                                 .done());
+
+                // same for StatelessSession
+                syntheticBeanBuildItemBuildProducer
+                        .produce(createSyntheticBean(persistenceUnitName,
+                                true, true,
+                                StatelessSession.class, STATELESS_SESSION_EXPOSED_TYPES, false)
+                                .createWith(recorder.statelessSessionSupplier(persistenceUnitName))
+                                .addInjectionPoint(ClassType.create(DotName.createSimple(TransactionSessions.class)))
+                                .done());
             }
         }
     }

extensions/hibernate-orm/deployment/src/main/java/io/quarkus/hibernate/orm/deployment/HibernateOrmProcessor.java

@@ -140,6 +140,7 @@
 import io.quarkus.hibernate.orm.runtime.JPAConfig;
 import io.quarkus.hibernate.orm.runtime.PersistenceUnitUtil;
 import io.quarkus.hibernate.orm.runtime.RequestScopedSessionHolder;
+import io.quarkus.hibernate.orm.runtime.RequestScopedStatelessSessionHolder;
 import io.quarkus.hibernate.orm.runtime.TransactionSessions;
 import io.quarkus.hibernate.orm.runtime.boot.QuarkusPersistenceUnitDefinition;
 import io.quarkus.hibernate.orm.runtime.boot.scan.QuarkusScanner;
@@ -674,6 +675,7 @@ void registerBeans(HibernateOrmConfig hibernateOrmConfig,
             unremovableClasses.add(TransactionSessions.class);
         }
         unremovableClasses.add(RequestScopedSessionHolder.class);
+        unremovableClasses.add(RequestScopedStatelessSessionHolder.class);
         unremovableClasses.add(QuarkusArcBeanContainer.class);
 
         additionalBeans.produce(AdditionalBeanBuildItem.builder().setUnremovable()

extensions/hibernate-orm/deployment/src/test/java/io/quarkus/hibernate/orm/stateless/StatelessSessionWithinRequestScopeTest.java

@@ -0,0 +1,46 @@
+package io.quarkus.hibernate.orm.stateless;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import jakarta.inject.Inject;
+
+import org.hibernate.StatelessSession;
+import org.jboss.shrinkwrap.api.asset.EmptyAsset;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.quarkus.arc.Arc;
+import io.quarkus.hibernate.orm.MyEntity;
+import io.quarkus.hibernate.orm.naming.PrefixPhysicalNamingStrategy;
+import io.quarkus.test.QuarkusUnitTest;
+
+public class StatelessSessionWithinRequestScopeTest {
+
+    @RegisterExtension
+    static QuarkusUnitTest runner = new QuarkusUnitTest()
+            .withApplicationRoot((jar) -> jar
+                    .addClasses(MyEntity.class, PrefixPhysicalNamingStrategy.class)
+                    .addAsResource(EmptyAsset.INSTANCE, "import.sql")
+                    .addAsResource("application-physical-naming-strategy.properties", "application.properties"));
+
+    @Inject
+    StatelessSession statelessSession;
+
+    @BeforeEach
+    public void activateRequestContext() {
+        Arc.container().requestContext().activate();
+    }
+
+    @Test
+    public void test() throws Exception {
+        Number result = (Number) statelessSession.createNativeQuery("SELECT COUNT(*) FROM TBL_MYENTITY").getSingleResult();
+        assertEquals(0, result.intValue());
+    }
+
+    @AfterEach
+    public void terminateRequestContext() {
+        Arc.container().requestContext().terminate();
+    }
+}

extensions/hibernate-orm/deployment/src/test/java/io/quarkus/hibernate/orm/stateless/StatelessSessionWithinTransactionTest.java

@@ -0,0 +1,47 @@
+package io.quarkus.hibernate.orm.stateless;
+
+import static org.assertj.core.api.Assertions.*;
+
+import java.util.List;
+
+import jakarta.inject.Inject;
+import jakarta.transaction.UserTransaction;
+
+import org.hibernate.Session;
+import org.hibernate.StatelessSession;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.quarkus.hibernate.orm.enhancer.Address;
+import io.quarkus.test.QuarkusUnitTest;
+
+public class StatelessSessionWithinTransactionTest {
+
+    @RegisterExtension
+    static QuarkusUnitTest runner = new QuarkusUnitTest()
+            .withApplicationRoot((jar) -> jar
+                    .addClass(Address.class))
+            .withConfigurationResource("application.properties");
+
+    @Inject
+    StatelessSession statelessSession;
+
+    @Inject
+    Session session;
+
+    @Inject
+    UserTransaction transaction;
+
+    @Test
+    public void test() throws Exception {
+        transaction.begin();
+        Address entity = new Address("high street");
+        session.persist(entity);
+        transaction.commit();
+
+        transaction.begin();
+        List<Object> list = statelessSession.createQuery("SELECT street from Address").getResultList();
+        assertThat(list).containsOnly("high street");
+        transaction.commit();
+    }
+}

extensions/hibernate-orm/runtime/src/main/java/io/quarkus/hibernate/orm/runtime/HibernateOrmRecorder.java

@@ -14,6 +14,7 @@
 import org.eclipse.microprofile.config.ConfigProvider;
 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
+import org.hibernate.StatelessSession;
 import org.hibernate.boot.archive.scan.spi.Scanner;
 import org.hibernate.engine.spi.SessionLazyDelegator;
 import org.hibernate.integrator.spi.Integrator;
@@ -126,6 +127,23 @@ public Session get() {
         };
     }
 
+    public Function<SyntheticCreationalContext<StatelessSession>, StatelessSession> statelessSessionSupplier(
+            String persistenceUnitName) {
+        return new Function<SyntheticCreationalContext<StatelessSession>, StatelessSession>() {
+
+            @Override
+            public StatelessSession apply(SyntheticCreationalContext<StatelessSession> context) {
+                TransactionSessions transactionSessions = context.getInjectedReference(TransactionSessions.class);
+                return new StatelessSessionLazyDelegator(new Supplier<StatelessSession>() {
+                    @Override
+                    public StatelessSession get() {
+                        return transactionSessions.getStatelessSession(persistenceUnitName);
+                    }
+                });
+            }
+        };
+    }
+
     public void doValidation(String puName) {
         Optional<String> val;
         if (puName.equals(PersistenceUnitUtil.DEFAULT_PERSISTENCE_UNIT_NAME)) {

extensions/hibernate-orm/runtime/src/main/java/io/quarkus/hibernate/orm/runtime/RequestScopedStatelessSessionHolder.java

@@ -0,0 +1,31 @@
+package io.quarkus.hibernate.orm.runtime;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import jakarta.annotation.PreDestroy;
+import jakarta.enterprise.context.RequestScoped;
+
+import org.hibernate.SessionFactory;
+import org.hibernate.StatelessSession;
+
+/**
+ * Bean that is used to manage request scoped stateless sessions
+ */
+@RequestScoped
+public class RequestScopedStatelessSessionHolder {
+
+    private final Map<String, StatelessSession> sessions = new HashMap<>();
+
+    public StatelessSession getOrCreateSession(String name, SessionFactory factory) {
+        return sessions.computeIfAbsent(name, (n) -> factory.openStatelessSession());
+    }
+
+    @PreDestroy
+    public void destroy() {
+        for (Map.Entry<String, StatelessSession> entry : sessions.entrySet()) {
+            entry.getValue().close();
+        }
+    }
+
+}