Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/5112#discussion_r159942085
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/experimental/package-info.java
---
@@ -0,0 +1,25 @@
+/*
+ * 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.
+ */
+
+/**
+ * This package holds classes that are experimental.
+ *
+ * They are NOT battle-tested code and may be changed or removed in future
versions.
--- End diff --
For checkstyle, you probably need to prepend new paragraphs with `<p>`.
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