fix: parse explicit Java action void returns as void

Symptom: CI failed in TestMxCheck_DoctypeScripts/empty_java_action_argument.mdl because a Java action declared as RETURNS Void was written as an entity return type named .void, and Studio Pro reported CE1613.

Root cause: the generic data-type visitor treats bare qualified names as entity/enumeration references. Java action return types reused that generic path, so the explicit Void spelling became a qualified name instead of ast.TypeVoid.

Fix: add a Java-action return-type wrapper that maps unqualified Void to ast.TypeVoid while leaving generic data-type parsing unchanged for parameters and attributes.

Tests: added visitor coverage for explicit RETURNS Void; verified mxcli check for the doctype fixture and the targeted integration subtest that failed in GitHub Actions.

Author: hjothamendix

mdl/visitor/visitor_javaaction.go

@@ -55,7 +55,7 @@ func (b *Builder) ExitCreateJavaActionStatement(ctx *parser.CreateJavaActionStat
 	// Get return type
 	if retType := ctx.JavaActionReturnType(); retType != nil {
 		if dt := retType.DataType(); dt != nil {
-			stmt.ReturnType = buildDataType(dt)
+			stmt.ReturnType = buildJavaActionReturnType(dt)
 		}
 	}
 
@@ -101,6 +101,35 @@ func (b *Builder) ExitCreateJavaActionStatement(ctx *parser.CreateJavaActionStat
 	b.statements = append(b.statements, stmt)
 }
 
+func buildJavaActionReturnType(ctx parser.IDataTypeContext) ast.DataType {
+	dt := buildDataType(ctx)
+	if isVoidReturnType(dt) {
+		return ast.DataType{Kind: ast.TypeVoid}
+	}
+	return dt
+}
+
+func isVoidReturnType(dt ast.DataType) bool {
+	var name ast.QualifiedName
+	switch dt.Kind {
+	case ast.TypeVoid:
+		return true
+	case ast.TypeEntity:
+		if dt.EntityRef == nil {
+			return false
+		}
+		name = *dt.EntityRef
+	case ast.TypeEnumeration:
+		if dt.EnumRef == nil {
+			return false
+		}
+		name = *dt.EnumRef
+	default:
+		return false
+	}
+	return name.Module == "" && strings.EqualFold(name.Name, "void")
+}
+
 // extractJavaImports separates `import ...;` lines from Java code.
 // Lines matching the Java import statement pattern are returned as imports;
 // the remaining lines form the method body. This handles the common case

mdl/visitor/visitor_javaaction_test.go

@@ -300,6 +300,27 @@ $$;`
 	}
 }
 
+func TestJavaAction_ExplicitVoidReturnType(t *testing.T) {
+	input := `CREATE JAVA ACTION MyModule.DoStuff()
+RETURNS Void
+AS $$
+System.out.println("done");
+$$;`
+
+	prog, errs := Build(input)
+	if len(errs) > 0 {
+		for _, err := range errs {
+			t.Errorf("Parse error: %v", err)
+		}
+		return
+	}
+
+	stmt := prog.Statements[0].(*ast.CreateJavaActionStmt)
+	if stmt.ReturnType.Kind != ast.TypeVoid {
+		t.Fatalf("ReturnType.Kind = %v, want TypeVoid", stmt.ReturnType.Kind)
+	}
+}
+
 func TestJavaAction_TypeParamWithMixedParamTypes(t *testing.T) {
 	// Mix ENTITY <pEntity> declaration, bare type param ref, and regular typed params
 	input := `CREATE JAVA ACTION MyModule.ProcessEntity(