First commit

.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**
+!**/src/test/**
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+
+### VS Code ###
+.vscode/

.mvn/wrapper/MavenWrapperDownloader.java

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+/*
+ * Copyright 2012-2019 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
+ *
+ *      https://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.
+ */
+
+import java.net.*;
+import java.io.*;
+import java.nio.channels.*;
+import java.util.Properties;
+
+public class MavenWrapperDownloader
+{
+
+    private static final String WRAPPER_VERSION = "0.5.5";
+    /**
+     * Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
+     */
+    private static final String DEFAULT_DOWNLOAD_URL = "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/"
+            + WRAPPER_VERSION + "/maven-wrapper-" + WRAPPER_VERSION + ".jar";
+
+    /**
+     * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
+     * use instead of the default one.
+     */
+    private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
+            ".mvn/wrapper/maven-wrapper.properties";
+
+    /**
+     * Path where the maven-wrapper.jar will be saved to.
+     */
+    private static final String MAVEN_WRAPPER_JAR_PATH =
+            ".mvn/wrapper/maven-wrapper.jar";
+
+    /**
+     * Name of the property which should be used to override the default download url for the wrapper.
+     */
+    private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
+
+    public static void main (String args[])
+    {
+        System.out.println ("- Downloader started");
+        File baseDirectory = new File (args[0]);
+        System.out.println ("- Using base directory: " + baseDirectory.getAbsolutePath ());
+
+        // If the maven-wrapper.properties exists, read it and check if it contains a custom
+        // wrapperUrl parameter.
+        File mavenWrapperPropertyFile = new File (baseDirectory , MAVEN_WRAPPER_PROPERTIES_PATH);
+        String url = DEFAULT_DOWNLOAD_URL;
+        if (mavenWrapperPropertyFile.exists ())
+        {
+            FileInputStream mavenWrapperPropertyFileInputStream = null;
+            try
+            {
+                mavenWrapperPropertyFileInputStream = new FileInputStream (mavenWrapperPropertyFile);
+                Properties mavenWrapperProperties = new Properties ();
+                mavenWrapperProperties.load (mavenWrapperPropertyFileInputStream);
+                url = mavenWrapperProperties.getProperty (PROPERTY_NAME_WRAPPER_URL , url);
+            }
+            catch (IOException e)
+            {
+                System.out.println ("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
+            }
+            finally
+            {
+                try
+                {
+                    if (mavenWrapperPropertyFileInputStream != null)
+                    {
+                        mavenWrapperPropertyFileInputStream.close ();
+                    }
+                }
+                catch (IOException e)
+                {
+                    // Ignore ...
+                }
+            }
+        }
+        System.out.println ("- Downloading from: " + url);
+
+        File outputFile = new File (baseDirectory.getAbsolutePath () , MAVEN_WRAPPER_JAR_PATH);
+        if (!outputFile.getParentFile ().exists ())
+        {
+            if (!outputFile.getParentFile ().mkdirs ())
+            {
+                System.out.println (
+                        "- ERROR creating output directory '" + outputFile.getParentFile ().getAbsolutePath () + "'");
+            }
+        }
+        System.out.println ("- Downloading to: " + outputFile.getAbsolutePath ());
+        try
+        {
+            downloadFileFromURL (url , outputFile);
+            System.out.println ("Done");
+            System.exit (0);
+        }
+        catch (Throwable e)
+        {
+            System.out.println ("- Error downloading");
+            e.printStackTrace ();
+            System.exit (1);
+        }
+    }
+
+    private static void downloadFileFromURL (String urlString , File destination) throws Exception
+    {
+        if (System.getenv ("MVNW_USERNAME") != null && System.getenv ("MVNW_PASSWORD") != null)
+        {
+            String username = System.getenv ("MVNW_USERNAME");
+            char[] password = System.getenv ("MVNW_PASSWORD").toCharArray ();
+            Authenticator.setDefault (new Authenticator ()
+            {
+                @Override
+                protected PasswordAuthentication getPasswordAuthentication ()
+                {
+                    return new PasswordAuthentication (username , password);
+                }
+            });
+        }
+        URL website = new URL (urlString);
+        ReadableByteChannel rbc;
+        rbc = Channels.newChannel (website.openStream ());
+        FileOutputStream fos = new FileOutputStream (destination);
+        fos.getChannel ().transferFrom (rbc , 0 , Long.MAX_VALUE);
+        fos.close ();
+        rbc.close ();
+    }
+
+}

.mvn/wrapper/maven-wrapper.properties

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+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.2/apache-maven-3.6.2-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.5/maven-wrapper-0.5.5.jar