HHH-19606 allow resource accessor method of type StatelessSession in Spring

this is a partial fix: need to consider other session types eventually

Author: gavinking

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

@@ -786,10 +786,10 @@ else if ( element.getKind() == ElementKind.INTERFACE
 			}
 			if ( !repository && jakartaDataRepository ) {
 				repository = true;
-				sessionType = springInjection
-						? SPRING_STATELESS_SESSION_PROVIDER
-						: HIB_STATELESS_SESSION;
-				addDaoConstructor( null );
+				// Jakarta Data defaults to StatelessSession, not EntityManager
+				sessionType = HIB_STATELESS_SESSION;
+				// If it's Spring, we wrap the StatelessSession in ObjectProvider
+				sessionType = addDaoConstructor( null );
 			}
 			if ( needsDefaultConstructor() ) {
 				addDefaultConstructor();
@@ -895,7 +895,11 @@ private boolean isReactivePanacheType(TypeElement type) {
 	 * it.
 	 */
 	private String addDaoConstructor(@Nullable ExecutableElement method) {
-		final String sessionType = method == null ? this.sessionType : fullReturnType(method);
+		final String returnType = method == null ? this.sessionType : fullReturnType( method );
+		final String sessionType =
+				jakartaDataRepository && springInjection
+						? SPRING_OBJECT_PROVIDER + '<' + returnType + '>'
+						: returnType;
 		final String sessionVariableName = getSessionVariableName( sessionType );
 		final String name = method == null ? sessionVariableName : method.getSimpleName().toString();
 

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

@@ -9,6 +9,7 @@
 import org.hibernate.processor.model.Metamodel;
 import org.hibernate.processor.util.Constants;
 
+import static org.hibernate.processor.util.Constants.HIB_STATELESS_SESSION;
 import static org.hibernate.processor.util.Constants.INJECT;
 import static org.hibernate.processor.util.Constants.NONNULL;
 
@@ -126,17 +127,29 @@ public String getAttributeDeclarationString() {
 					.append("public ");
 			notNull( declaration );
 			declaration
-					.append(annotationMetaEntity.importType(sessionTypeName))
+					.append(annotationMetaEntity.importType(providedSessionType()))
 					.append(" ")
 					.append(methodName)
 					.append("() {")
 					.append("\n\treturn ")
-					.append(sessionVariableName)
+					.append(sessionVariableName);
+			if ( annotationMetaEntity.isProvidedSessionAccess() ) {
+				declaration
+						.append( ".getObject()" );
+			}
+			declaration
 					.append(";\n}");
 		}
 		return declaration.toString();
 	}
 
+	private String providedSessionType() {
+		return annotationMetaEntity.isProvidedSessionAccess()
+				//TODO: assuming provided sessions are always StatelessSessions for now
+				? HIB_STATELESS_SESSION
+				: sessionTypeName;
+	}
+
 	/**
 	 * In Quarkus we use the Quarkus-specific {@code @PersistenceUnit}
 	 * CDI qualifier annotation to inject the {@code StatelessSession}