[MINOR] Fix apache-rat violations (#1639)

* MINOR Fix apache-rat violations. Also, enabling RAT for hudi-utilities and hudi-integ-test

hudi-common/src/main/java/org/apache/hudi/common/util/ObjectSizeCalculator.java

@@ -1,18 +1,20 @@
-// =================================================================================================
-// Copyright 2011 Twitter, Inc.
-// -------------------------------------------------------------------------------------------------
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this work except in compliance with the License.
-// You may obtain a copy of the License in the LICENSE file, or 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.
-// =================================================================================================
+/*
+ * 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.hudi.common.util;
 

hudi-integ-test/pom.xml

@@ -231,6 +231,10 @@
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <groupId>org.apache.rat</groupId>
+        <artifactId>apache-rat-plugin</artifactId>
+      </plugin>
     </plugins>
   </build>
 </project>

hudi-utilities/pom.xml

@@ -56,6 +56,10 @@
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <groupId>org.apache.rat</groupId>
+        <artifactId>apache-rat-plugin</artifactId>
+      </plugin>
     </plugins>
 
     <resources>

hudi-utilities/src/main/java/org/apache/hudi/utilities/exception/HoodieSnapshotExporterException.java

@@ -1,3 +1,21 @@
+/*
+ * 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.hudi.utilities.exception;
 
 import org.apache.hudi.exception.HoodieException;

hudi-utilities/src/test/java/org/apache/hudi/utilities/sources/TestInputBatch.java

@@ -1,3 +1,21 @@
+/*
+ * 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.hudi.utilities.sources;
 
 import org.apache.hudi.common.util.Option;

pom.xml

@@ -352,6 +352,7 @@
               <exclude>**/test/resources/*.commit</exclude>
               <exclude>**/target/**</exclude>
               <exclude>**/generated-sources/**</exclude>
+              <exclude>.github/**</exclude>
             </excludes>
           </configuration>
           <executions>