Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+<!--
+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.
+-->
+
+# Jars.
+
+This directory is responsible to generate the jar files for the Arrow components that depend on C++ shared libraries to execute.
+
+The Arrow C++ libraries are compiled both on MacOS and Linux distributions, with their dependencies linked statically, and they are added
+in the jars at the end, so the file can be used on both systems.
+
+## Linux Docker Image
+To compile the C++ libraries in Linux, a docker image is used. 
+It is created used the **ci/docker/java-bundled-jars.dockerfile** file. 
+If it is necessary to add any new dependency, you need to change that file.
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