CAMEL-23384: fix camel export on kamelets using transformDataType

dsl/camel-kamelet-main/src/main/java/org/apache/camel/main/download/DependencyDownloaderTransformerResolver.java

@@ -59,6 +59,7 @@ public Transformer resolve(TransformerKey key, CamelContext context) {
             answer = super.resolve(key, context);
         } else {
             answer = new StubTransformer();
+            answer.setName(name);
         }
 
         if (answer == null) {

dsl/camel-kamelet-main/src/test/java/org/apache/camel/main/download/DependencyDownloaderTransformerResolverTest.java

@@ -0,0 +1,47 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.main.download;
+
+import org.apache.camel.impl.engine.SimpleCamelContext;
+import org.apache.camel.spi.Transformer;
+import org.apache.camel.spi.TransformerKey;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+public class DependencyDownloaderTransformerResolverTest {
+
+    @Test
+    void stubTransformerShouldHaveNameSet() {
+        SimpleCamelContext context = new SimpleCamelContext();
+        DependencyDownloaderTransformerResolver resolver
+                = new DependencyDownloaderTransformerResolver(context, "*", true);
+
+        // use a name not in the catalog to avoid triggering artifact download
+        String transformerName = "test-stub:application-json";
+        TransformerKey key = new TransformerKey(transformerName);
+        Transformer transformer = resolver.resolve(key, context);
+
+        assertNotNull(transformer);
+        assertEquals(transformerName, transformer.getName(),
+                "StubTransformer must have the requested name set");
+
+        TransformerKey resultKey = TransformerKey.createFrom(transformer);
+        assertNotNull(resultKey);
+    }
+}