fix rat checks
diff --git a/pom.xml b/pom.xml
index ef211dc..d32e6e0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -921,6 +921,9 @@
               <!-- typeahead -->
               <exclude>**/typeahead.*</exclude>
 
+              <!-- js-min-map -->
+              <exclude>**/*.map</exclude>
+
               <!-- prism (tobago-example-demo) -->
               <exclude>**/src/main/webapp/script/prism*.*</exclude>
               <exclude>**/src/main/webapp/style/prism*.*</exclude>
diff --git a/tobago-example/tobago-example-demo/src/main/java/org/apache/myfaces/tobago/example/demo/TreeUtils.java b/tobago-example/tobago-example-demo/src/main/java/org/apache/myfaces/tobago/example/demo/TreeUtils.java
index 3401454..3b87da3 100644
--- a/tobago-example/tobago-example-demo/src/main/java/org/apache/myfaces/tobago/example/demo/TreeUtils.java
+++ b/tobago-example/tobago-example-demo/src/main/java/org/apache/myfaces/tobago/example/demo/TreeUtils.java
@@ -1,3 +1,22 @@
+/*
+ * 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.myfaces.tobago.example.demo;
 
 import javax.swing.tree.DefaultMutableTreeNode;