HHH-18953 correctly handle Optional in reactive repos

Author: gavinking

tooling/metamodel-generator/src/jakartaData/java/org/hibernate/processor/test/data/reactive/Library2.java

@@ -23,6 +23,7 @@
 
 import java.time.LocalDate;
 import java.util.List;
+import java.util.Optional;
 
 @Repository
 public interface Library2 {
@@ -32,6 +33,9 @@ public interface Library2 {
 	@Find
 	Uni<Book> book(String isbn);
 
+	@Find
+	Uni<Optional<Book>> maybeBook(String isbn);
+
 	@Find
 	Uni<List<Book>> books(@By("isbn") List<String> isbns);
 

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

@@ -85,6 +85,13 @@ public String getAttributeDeclarationString() {
 
 	private void throwIfNull(StringBuilder declaration) {
 		if (containerType != null) {
+			if ( isReactive() ) {
+				declaration
+						.append("\n\t\t\t.map(")
+						.append(annotationMetaEntity.importType(containerType))
+						.append("::")
+						.append("ofNullable");
+			}
 			declaration
 					.append(')');
 		}
@@ -157,7 +164,7 @@ private void varOrReturn(StringBuilder declaration) {
 			declaration
 					.append("\ttry {\n\t");
 		}
-		if (containerType != null) {
+		if (containerType != null && !isReactive()) {
 			declaration
 					.append("\treturn ")
 					.append(annotationMetaEntity.staticImport(containerType, "ofNullable"))