Add support for DataTypeTransformer annotation in native mode

Author: gansheer

extensions-core/core/deployment/src/main/java/org/apache/camel/quarkus/core/deployment/CamelProcessor.java

@@ -43,6 +43,7 @@
 import io.quarkus.deployment.builditem.ApplicationArchivesBuildItem;
 import io.quarkus.deployment.builditem.CombinedIndexBuildItem;
 import io.quarkus.deployment.builditem.nativeimage.NativeImageResourceBuildItem;
+import io.quarkus.deployment.builditem.nativeimage.ReflectiveClassBuildItem;
 import io.quarkus.maven.dependency.ArtifactKey;
 import io.quarkus.runtime.RuntimeValue;
 import io.smallrye.common.annotation.Identifier;
@@ -431,6 +432,37 @@ CamelComponentNameResolverBuildItem componentNameResolver(
         return new CamelComponentNameResolverBuildItem(recorder.createComponentNameResolver(componentNames));
     }
 
+    /**
+     * Discovers classes annotated with @DataTypeTransformer for package scanning and reflection.
+     * This enables transformer.scan() to work in native mode.
+     */
+    @BuildStep
+    void discoverDataTypeTransformers(
+            CombinedIndexBuildItem combinedIndex,
+            BuildProducer<CamelPackageScanClassBuildItem> packageScanClass,
+            BuildProducer<ReflectiveClassBuildItem> reflectiveClass) {
+
+        IndexView view = combinedIndex.getIndex();
+        DotName dataTypeTransformer = DotName.createSimple("org.apache.camel.spi.DataTypeTransformer");
+
+        Set<String> transformerClasses = view.getAnnotations(dataTypeTransformer)
+                .stream()
+                .filter(ai -> ai.target().kind() == org.jboss.jandex.AnnotationTarget.Kind.CLASS)
+                .map(ai -> ai.target().asClass().name().toString())
+                .collect(Collectors.toSet());
+
+        if (!transformerClasses.isEmpty()) {
+            LOGGER.debug("Found @DataTypeTransformer annotated classes: {}", transformerClasses);
+            packageScanClass.produce(new CamelPackageScanClassBuildItem(transformerClasses));
+
+            // Register transformer classes for reflection so they can be instantiated at runtime
+            transformerClasses.forEach(className -> reflectiveClass.produce(
+                    ReflectiveClassBuildItem.builder(className)
+                            .methods()
+                            .build()));
+        }
+    }
+
     @Record(ExecutionTime.STATIC_INIT)
     @BuildStep
     CamelPackageScanClassResolverBuildItem packageScanClassResolver(