KAFKA-12593: Fix Apache License headers (#10452)

* Standardize license headers in scala, python, and gradle files.
* Relocate copyright attribution to the NOTICE.
* Add a license header check to `spotless` for scala files.

Reviewers: Ewen Cheslack-Postava <ewencp@apache.org>, Matthias J. Sax <mjsax@apache.org>, A. Sophie Blee-Goldman <ableegoldman@apache.org

NOTICE

@@ -10,3 +10,7 @@ License. The source code of jersey can be found at https://github.com/jersey/jer
 This distribution has a binary test dependency on jqwik, which is available under
 the Eclipse Public License 2.0. The source code can be found at
 https://github.com/jlink/jqwik.
+
+The streams-scala (streams/streams-scala) module was donated by Lightbend and the original code was copyrighted by them:
+Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
+Copyright (C) 2017-2018 Alexis Seigneurin.

build.gradle

@@ -46,6 +46,7 @@ spotless {
   scala {
     target 'streams/**/*.scala'
     scalafmt("$versions.scalafmt").configFile('checkstyle/.scalafmt.conf')
+    licenseHeaderFile 'checkstyle/java.header', 'package'
   }
 }
 

gradlew

@@ -1,8 +1,5 @@
 #!/usr/bin/env sh
 
-#
-# Copyright 2015 the original author or authors.
-#
 # Licensed 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

streams/streams-scala/NOTICE

@@ -1,3 +0,0 @@
-Kafka Streams Scala
-Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
-Copyright (C) 2017-2018 Alexis Seigneurin.

streams/streams-scala/src/main/scala/org/apache/kafka/streams/scala/FunctionConversions.scala

@@ -1,7 +1,4 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
- * Copyright (C) 2017-2018 Alexis Seigneurin.
- *
  * 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.

streams/streams-scala/src/main/scala/org/apache/kafka/streams/scala/ImplicitConversions.scala

@@ -1,7 +1,4 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
- * Copyright (C) 2017-2018 Alexis Seigneurin.
- *
  * 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.

streams/streams-scala/src/main/scala/org/apache/kafka/streams/scala/Serdes.scala

@@ -1,7 +1,4 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
- * Copyright (C) 2017-2018 Alexis Seigneurin.
- *
  * 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.

streams/streams-scala/src/main/scala/org/apache/kafka/streams/scala/StreamsBuilder.scala

@@ -1,7 +1,4 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
- * Copyright (C) 2017-2018 Alexis Seigneurin.
- *
  * 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.

streams/streams-scala/src/main/scala/org/apache/kafka/streams/scala/kstream/KGroupedStream.scala

@@ -1,7 +1,4 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
- * Copyright (C) 2017-2018 Alexis Seigneurin.
- *
  * 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.

streams/streams-scala/src/main/scala/org/apache/kafka/streams/scala/kstream/KGroupedTable.scala

@@ -1,7 +1,4 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
- * Copyright (C) 2017-2018 Alexis Seigneurin.
- *
  * 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.

streams/streams-scala/src/main/scala/org/apache/kafka/streams/scala/kstream/KStream.scala

@@ -1,7 +1,4 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
- * Copyright (C) 2017-2018 Alexis Seigneurin.
- *
  * 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.

streams/streams-scala/src/main/scala/org/apache/kafka/streams/scala/kstream/KTable.scala

@@ -1,7 +1,4 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
- * Copyright (C) 2017-2018 Alexis Seigneurin.
- *
  * 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.

streams/streams-scala/src/main/scala/org/apache/kafka/streams/scala/kstream/SessionWindowedKStream.scala

@@ -1,7 +1,4 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
- * Copyright (C) 2017-2018 Alexis Seigneurin.
- *
  * 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.

streams/streams-scala/src/main/scala/org/apache/kafka/streams/scala/kstream/TimeWindowedKStream.scala

@@ -1,7 +1,4 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
- * Copyright (C) 2017-2018 Alexis Seigneurin.
- *
  * 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.

streams/streams-scala/src/main/scala/org/apache/kafka/streams/scala/package.scala

@@ -1,7 +1,4 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
- * Copyright (C) 2017-2018 Alexis Seigneurin.
- *
  * 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.

streams/streams-scala/src/main/scala/org/apache/kafka/streams/scala/serialization/Serdes.scala

@@ -1,7 +1,4 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
- * Copyright (C) 2017-2018 Alexis Seigneurin.
- *
  * 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.

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/StreamToTableJoinScalaIntegrationTestImplicitSerdes.scala

@@ -1,10 +1,10 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
+ * Licensed to the Apache Software Foundation (ASF) under one or more
- * Copyright (C) 2017-2018 Alexis Seigneurin.
+ * contributor license agreements. See the NOTICE file distributed with
- *
+ * this work for additional information regarding copyright ownership.
- * Licensed under the Apache License, Version 2.0 (the "License");
+ * The ASF licenses this file to You under the Apache License, Version 2.0
- * you may not use this file except in compliance with the License.
+ * (the "License"); you may not use this file except in compliance with
- * You may obtain a copy of the License at
+ * the License. You may obtain a copy of the License at
  *
  *    http://www.apache.org/licenses/LICENSE-2.0
  *

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/TopologyTest.scala

@@ -1,7 +1,4 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
- * Copyright (C) 2017-2018 Alexis Seigneurin.
- *
  * 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.

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/WordCountTest.scala

@@ -1,7 +1,4 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
- * Copyright (C) 2017-2018 Alexis Seigneurin.
- *
  * 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.

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/kstream/ConsumedTest.scala

@@ -1,6 +1,4 @@
 /*
- * Copyright (C) 2018 Joan Goyeau.
- *
  * 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.

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/kstream/JoinedTest.scala

@@ -1,6 +1,4 @@
 /*
- * Copyright (C) 2018 Joan Goyeau.
- *
  * 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.

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/kstream/KStreamSplitTest.scala

@@ -1,6 +1,4 @@
 /*
- * Copyright (C) 2018 Joan Goyeau.
- *
  * 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.

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/kstream/KStreamTest.scala

@@ -1,6 +1,4 @@
 /*
- * Copyright (C) 2018 Joan Goyeau.
- *
  * 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.

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/kstream/KTableTest.scala

@@ -1,6 +1,4 @@
 /*
- * Copyright (C) 2018 Joan Goyeau.
- *
  * 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.

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/kstream/MaterializedTest.scala

@@ -1,6 +1,4 @@
 /*
- * Copyright (C) 2018 Joan Goyeau.
- *
  * 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.

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/kstream/ProducedTest.scala

@@ -1,6 +1,4 @@
 /*
- * Copyright (C) 2018 Joan Goyeau.
- *
  * 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.

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/kstream/RepartitionedTest.scala

@@ -1,6 +1,4 @@
 /*
- * Copyright (C) 2018 Joan Goyeau.
- *
  * 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.

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/kstream/SuppressedTest.scala

@@ -1,6 +1,4 @@
 /*
- * Copyright (C) 2018 Joan Goyeau.
- *
  * 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.

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/utils/StreamToTableJoinScalaIntegrationTestBase.scala

@@ -1,10 +1,10 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
+ * Licensed to the Apache Software Foundation (ASF) under one or more
- * Copyright (C) 2017-2018 Alexis Seigneurin.
+ * contributor license agreements. See the NOTICE file distributed with
- *
+ * this work for additional information regarding copyright ownership.
- * Licensed under the Apache License, Version 2.0 (the "License");
+ * The ASF licenses this file to You under the Apache License, Version 2.0
- * you may not use this file except in compliance with the License.
+ * (the "License"); you may not use this file except in compliance with
- * You may obtain a copy of the License at
+ * the License. You may obtain a copy of the License at
  *
  *    http://www.apache.org/licenses/LICENSE-2.0
  *

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/utils/StreamToTableJoinTestData.scala

@@ -1,10 +1,10 @@
 /*
- * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
+ * Licensed to the Apache Software Foundation (ASF) under one or more
- * Copyright (C) 2017-2018 Alexis Seigneurin.
+ * contributor license agreements. See the NOTICE file distributed with
- *
+ * this work for additional information regarding copyright ownership.
- * Licensed under the Apache License, Version 2.0 (the "License");
+ * The ASF licenses this file to You under the Apache License, Version 2.0
- * you may not use this file except in compliance with the License.
+ * (the "License"); you may not use this file except in compliance with
- * You may obtain a copy of the License at
+ * the License. You may obtain a copy of the License at
  *
  *    http://www.apache.org/licenses/LICENSE-2.0
  *

streams/streams-scala/src/test/scala/org/apache/kafka/streams/scala/utils/TestDriver.scala

@@ -1,6 +1,4 @@
 /*
- * Copyright (C) 2018 Joan Goyeau.
- *
  * 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.

tests/kafkatest/tests/client/message_format_change_test.py

@@ -1,5 +1,3 @@
-# Copyright 2015 Confluent Inc.
-#
 # Licensed 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

tests/kafkatest/tests/core/compatibility_test_new_broker_test.py

@@ -1,5 +1,3 @@
-# Copyright 2015 Confluent Inc.
-#
 # Licensed 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

tests/kafkatest/tests/streams/utils/util.py

@@ -1,5 +1,3 @@
-# Copyright 2015 Confluent Inc.
-#
 # Licensed 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

tests/kafkatest/utils/util.py

@@ -1,5 +1,3 @@
-# Copyright 2015 Confluent Inc.
-#
 # Licensed 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