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The following commit(s) were added to refs/heads/trunk by this push:
     new 8222ac0f546 HADOOP-19798. Add Maven Wrapper (#8221)
8222ac0f546 is described below

commit 8222ac0f546911b387b6a141e06dd8bf5306d565
Author: Cheng Pan <[email protected]>
AuthorDate: Tue Feb 3 21:10:26 2026 +0800

    HADOOP-19798. Add Maven Wrapper (#8221)
    
    
    The Maven wrapper tool is used to automatically download a version of 
Apache Maven compatible with
    Hadoop builds when the ./mvnw command is invoked.
    
    To ensure a secure build process, the sha256 checksum is validated before 
execution.
    
    Contributed by Cheng Pan
---
 .gitignore                               |   3 +-
 .mvn/jvm.config                          |   2 +
 .mvn/wrapper/MavenWrapperDownloader.java |  95 +++++++++
 .mvn/wrapper/maven-wrapper.properties    |  23 +++
 BUILDING.txt                             |   4 +-
 mvnw                                     | 338 +++++++++++++++++++++++++++++++
 mvnw.cmd                                 | 206 +++++++++++++++++++
 7 files changed, 667 insertions(+), 4 deletions(-)

diff --git a/.gitignore b/.gitignore
index 617d5d2bc98..8e20dcd0ccd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -61,5 +61,4 @@ log.html
 output.xml
 report.html
 
-
-.mvn
+.mvn/wrapper/maven-wrapper.jar
diff --git a/.mvn/jvm.config b/.mvn/jvm.config
new file mode 100644
index 00000000000..83e07ff77f7
--- /dev/null
+++ b/.mvn/jvm.config
@@ -0,0 +1,2 @@
+-Xms256m
+-Xmx3072m
diff --git a/.mvn/wrapper/MavenWrapperDownloader.java 
b/.mvn/wrapper/MavenWrapperDownloader.java
new file mode 100644
index 00000000000..173a334936b
--- /dev/null
+++ b/.mvn/wrapper/MavenWrapperDownloader.java
@@ -0,0 +1,95 @@
+/*
+ * 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.
+ */
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.Authenticator;
+import java.net.PasswordAuthentication;
+import java.net.URI;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
+import java.util.concurrent.ThreadLocalRandom;
+
+public final class MavenWrapperDownloader {
+
+  private static final String WRAPPER_VERSION = "3.3.4";
+
+  private static final boolean VERBOSE = 
Boolean.parseBoolean(System.getenv("MVNW_VERBOSE"));
+
+  public static void main(String[] args) {
+    log("Apache Maven Wrapper Downloader " + WRAPPER_VERSION);
+
+    if (args.length != 2) {
+      System.err.println(" - ERROR wrapperUrl or wrapperJarPath parameter 
missing");
+      System.exit(1);
+    }
+
+    try {
+      log(" - Downloader started");
+      final URL wrapperUrl = URI.create(args[0]).toURL();
+      final Path baseDir = Paths.get(".").toAbsolutePath().normalize();
+      final Path wrapperJarPath = baseDir.resolve(args[1]).normalize();
+      if (!wrapperJarPath.startsWith(baseDir)) {
+        throw new IOException("Invalid path: outside of allowed directory");
+      }
+      downloadFileFromURL(wrapperUrl, wrapperJarPath);
+      log("Done");
+    } catch (IOException e) {
+      System.err.println("- Error downloading: " + e.getMessage());
+      if (VERBOSE) {
+        e.printStackTrace();
+      }
+      System.exit(1);
+    }
+  }
+
+  private static void downloadFileFromURL(URL wrapperUrl, Path wrapperJarPath) 
throws IOException {
+    log(" - Downloading to: " + wrapperJarPath);
+    if (System.getenv("MVNW_USERNAME") != null && 
System.getenv("MVNW_PASSWORD") != null) {
+      final String username = System.getenv("MVNW_USERNAME");
+      final char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
+      Authenticator.setDefault(new Authenticator() {
+        @Override
+        protected PasswordAuthentication getPasswordAuthentication() {
+          return new PasswordAuthentication(username, password);
+        }
+      });
+    }
+
+    Path temp = wrapperJarPath.getParent()
+      .resolve(wrapperJarPath.getFileName() + "." + 
Long.toUnsignedString(ThreadLocalRandom.current().nextLong()) + ".tmp");
+
+    try (InputStream inStream = wrapperUrl.openStream()) {
+      Files.copy(inStream, temp, StandardCopyOption.REPLACE_EXISTING);
+      Files.move(temp, wrapperJarPath, StandardCopyOption.REPLACE_EXISTING);
+    } finally {
+      Files.deleteIfExists(temp);
+    }
+    log(" - Downloader complete");
+  }
+
+  private static void log(String msg) {
+    if (VERBOSE) {
+      System.out.println(msg);
+    }
+  }
+}
diff --git a/.mvn/wrapper/maven-wrapper.properties 
b/.mvn/wrapper/maven-wrapper.properties
new file mode 100644
index 00000000000..3ec5ff83c07
--- /dev/null
+++ b/.mvn/wrapper/maven-wrapper.properties
@@ -0,0 +1,23 @@
+#
+# 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.
+#
+wrapperVersion=3.3.4
+distributionType=source
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.11/apache-maven-3.9.11-bin.zip
+distributionSha256Sum=0d7125e8c91097b36edb990ea5934e6c68b4440eef4ea96510a0f6815e7eeadb
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.3.4/maven-wrapper-3.3.4.jar
+wrapperSha256Sum=4e2fbf6554bc8a4702cdfdd3bef464f423393d784ddbb037216320ce55d5e4e1
diff --git a/BUILDING.txt b/BUILDING.txt
index 19edd1b0ce3..624cfc8fb0c 100644
--- a/BUILDING.txt
+++ b/BUILDING.txt
@@ -5,7 +5,7 @@ Requirements:
 
 * Unix System
 * JDK 17
-* Maven 3.3 or later
+* Maven 3.9.11 or later (optional, a compatible version is automatically 
downloaded if using ./mvnw)
 * Boost 1.86.0 (if compiling native code)
 * Protocol Buffers 3.25.5 (if compiling native code)
 * CMake 3.19 or newer (if compiling native code)
@@ -583,7 +583,7 @@ Requirements:
 
 * Windows 10
 * JDK 17
-* Maven 3.3 or later (maven.apache.org)
+* Maven 3.9.11 or later (maven.apache.org, optional, a compatible version is 
automatically downloaded if using mvnw.cmd)
 * Boost 1.86.0 (boost.org)
 * Protocol Buffers 3.25.5 (https://github.com/protocolbuffers/protobuf/tags)
 * CMake 3.19 or newer (cmake.org)
diff --git a/mvnw b/mvnw
new file mode 100755
index 00000000000..1ddd97b9ee3
--- /dev/null
+++ b/mvnw
@@ -0,0 +1,338 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# 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.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Apache Maven Wrapper startup batch script, version 3.3.4
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug 
-Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ]; then
+
+  if [ -f /usr/local/etc/mavenrc ]; then
+    . /usr/local/etc/mavenrc
+  fi
+
+  if [ -f /etc/mavenrc ]; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ]; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false
+darwin=false
+mingw=false
+case "$(uname)" in
+CYGWIN*) cygwin=true ;;
+MINGW*) mingw=true ;;
+Darwin*)
+  darwin=true
+  # Use /usr/libexec/java_home if available, otherwise fall back to 
/Library/Java/Home
+  # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+  if [ -z "$JAVA_HOME" ]; then
+    if [ -x "/usr/libexec/java_home" ]; then
+      JAVA_HOME="$(/usr/libexec/java_home)"
+      export JAVA_HOME
+    else
+      JAVA_HOME="/Library/Java/Home"
+      export JAVA_HOME
+    fi
+  fi
+  ;;
+esac
+
+if [ -z "$JAVA_HOME" ]; then
+  if [ -r /etc/gentoo-release ]; then
+    JAVA_HOME=$(java-config --jre-home)
+  fi
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin; then
+  [ -n "$JAVA_HOME" ] \
+    && JAVA_HOME=$(cygpath --unix "$JAVA_HOME")
+  [ -n "$CLASSPATH" ] \
+    && CLASSPATH=$(cygpath --path --unix "$CLASSPATH")
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw; then
+  [ -n "$JAVA_HOME" ] && [ -d "$JAVA_HOME" ] \
+    && JAVA_HOME="$(
+      cd "$JAVA_HOME" || (
+        echo "cannot cd into $JAVA_HOME." >&2
+        exit 1
+      )
+      pwd
+    )"
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="$(which javac)"
+  if [ -n "$javaExecutable" ] && ! [ "$(expr "$javaExecutable" : '\([^ ]*\)')" 
= "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=$(which readlink)
+    if [ ! "$(expr "$readLink" : '\([^ ]*\)')" = "no" ]; then
+      if $darwin; then
+        javaHome="$(dirname "$javaExecutable")"
+        javaExecutable="$(cd "$javaHome" && pwd -P)/javac"
+      else
+        javaExecutable="$(readlink -f "$javaExecutable")"
+      fi
+      javaHome="$(dirname "$javaExecutable")"
+      javaHome=$(expr "$javaHome" : '\(.*\)/bin')
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ]; then
+  if [ -n "$JAVA_HOME" ]; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ]; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+    fi
+  else
+    JAVACMD="$(
+      \unset -f command 2>/dev/null
+      \command -v java
+    )"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ]; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  echo "Warning: JAVA_HOME environment variable is not set." >&2
+fi
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+  if [ -z "$1" ]; then
+    echo "Path not specified to find_maven_basedir" >&2
+    return 1
+  fi
+
+  basedir="$1"
+  wdir="$1"
+  while [ "$wdir" != '/' ]; do
+    if [ -d "$wdir"/.mvn ]; then
+      basedir=$wdir
+      break
+    fi
+    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+    if [ -d "${wdir}" ]; then
+      wdir=$(
+        cd "$wdir/.." || exit 1
+        pwd
+      )
+    fi
+    # end of workaround
+  done
+  printf '%s' "$(
+    cd "$basedir" || exit 1
+    pwd
+  )"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    # Remove \r in case we run on Windows within Git Bash
+    # and check out the repository with auto CRLF management
+    # enabled. Otherwise, we may read lines that are delimited with
+    # \r\n and produce $'-Xarg\r' rather than -Xarg due to word
+    # splitting rules.
+    tr -s '\r\n' ' ' <"$1"
+  fi
+}
+
+log() {
+  if [ "$MVNW_VERBOSE" = true ]; then
+    printf '%s\n' "$1"
+  fi
+}
+
+BASE_DIR=$(find_maven_basedir "$(dirname "$0")")
+if [ -z "$BASE_DIR" ]; then
+  exit 1
+fi
+
+MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
+export MAVEN_PROJECTBASEDIR
+log "$MAVEN_PROJECTBASEDIR"
+
+trim() {
+  # MWRAPPER-139:
+  #   Trims trailing and leading whitespace, carriage returns, tabs, and 
linefeeds.
+  #   Needed for removing poorly interpreted newline sequences when running in 
more
+  #   exotic environments such as mingw bash on Windows.
+  printf "%s" "${1}" | tr -d '[:space:]'
+}
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from 
Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in 
binary data.
+##########################################################################################
+wrapperJarPath="$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar"
+if [ -r "$wrapperJarPath" ]; then
+  log "Found $wrapperJarPath"
+else
+  log "Couldn't find $wrapperJarPath, downloading it ..."
+
+  if [ -n "$MVNW_REPOURL" ]; then
+    
wrapperUrl="$MVNW_REPOURL/org/apache/maven/wrapper/maven-wrapper/3.3.4/maven-wrapper-3.3.4.jar"
+  else
+    
wrapperUrl="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.3.4/maven-wrapper-3.3.4.jar";
+  fi
+  while IFS="=" read -r key value; do
+    case "$key" in wrapperUrl)
+      wrapperUrl=$(trim "${value-}")
+      break
+      ;;
+    esac
+  done <"$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.properties"
+  log "Downloading from: $wrapperUrl"
+
+  if $cygwin; then
+    wrapperJarPath=$(cygpath --path --windows "$wrapperJarPath")
+  fi
+
+  if command -v wget >/dev/null; then
+    log "Found wget ... using wget"
+    [ "$MVNW_VERBOSE" = true ] && QUIET="" || QUIET="--quiet"
+    if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+      wget ${QUIET:+"$QUIET"} "$wrapperUrl" -O "$wrapperJarPath" || rm -f 
"$wrapperJarPath"
+    else
+      wget ${QUIET:+"$QUIET"} --http-user="$MVNW_USERNAME" 
--http-password="$MVNW_PASSWORD" "$wrapperUrl" -O "$wrapperJarPath" || rm -f 
"$wrapperJarPath"
+    fi
+  elif command -v curl >/dev/null; then
+    log "Found curl ... using curl"
+    [ "$MVNW_VERBOSE" = true ] && QUIET="" || QUIET="--silent"
+    if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+      curl ${QUIET:+"$QUIET"} -o "$wrapperJarPath" "$wrapperUrl" -f -L || rm 
-f "$wrapperJarPath"
+    else
+      curl ${QUIET:+"$QUIET"} --user "$MVNW_USERNAME:$MVNW_PASSWORD" -o 
"$wrapperJarPath" "$wrapperUrl" -f -L || rm -f "$wrapperJarPath"
+    fi
+  else
+    log "Falling back to using Java to download"
+    javaSource="$MAVEN_PROJECTBASEDIR/.mvn/wrapper/MavenWrapperDownloader.java"
+    javaClass="$MAVEN_PROJECTBASEDIR/.mvn/wrapper/MavenWrapperDownloader.class"
+    # For Cygwin, switch paths to Windows format before running javac
+    if $cygwin; then
+      javaSource=$(cygpath --path --windows "$javaSource")
+      javaClass=$(cygpath --path --windows "$javaClass")
+    fi
+    if [ -e "$javaSource" ]; then
+      if [ ! -e "$javaClass" ]; then
+        log " - Compiling MavenWrapperDownloader.java ..."
+        ("$JAVA_HOME/bin/javac" "$javaSource")
+      fi
+      if [ -e "$javaClass" ]; then
+        log " - Running MavenWrapperDownloader.java ..."
+        ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader 
"$wrapperUrl" "$wrapperJarPath") || rm -f "$wrapperJarPath"
+      fi
+    fi
+  fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+# If specified, validate the SHA-256 sum of the Maven wrapper jar file
+wrapperSha256Sum=""
+while IFS="=" read -r key value; do
+  case "$key" in wrapperSha256Sum)
+    wrapperSha256Sum=$(trim "${value-}")
+    break
+    ;;
+  esac
+done <"$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.properties"
+if [ -n "$wrapperSha256Sum" ]; then
+  wrapperSha256Result=false
+  if command -v sha256sum >/dev/null; then
+    if echo "$wrapperSha256Sum  $wrapperJarPath" | sha256sum -c - >/dev/null 
2>&1; then
+      wrapperSha256Result=true
+    fi
+  elif command -v shasum >/dev/null; then
+    if echo "$wrapperSha256Sum  $wrapperJarPath" | shasum -a 256 -c >/dev/null 
2>&1; then
+      wrapperSha256Result=true
+    fi
+  else
+    echo "Checksum validation was requested but neither 'sha256sum' or 
'shasum' are available." >&2
+    echo "Please install either command, or disable validation by removing 
'wrapperSha256Sum' from your maven-wrapper.properties." >&2
+    exit 1
+  fi
+  if [ $wrapperSha256Result = false ]; then
+    echo "Error: Failed to validate Maven wrapper SHA-256, your Maven wrapper 
might be compromised." >&2
+    echo "Investigate or delete $wrapperJarPath to attempt a clean download." 
>&2
+    echo "If you updated your Maven version, you need to update the specified 
wrapperSha256Sum property." >&2
+    exit 1
+  fi
+fi
+
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") 
$MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$JAVA_HOME" ] \
+    && JAVA_HOME=$(cygpath --path --windows "$JAVA_HOME")
+  [ -n "$CLASSPATH" ] \
+    && CLASSPATH=$(cygpath --path --windows "$CLASSPATH")
+  [ -n "$MAVEN_PROJECTBASEDIR" ] \
+    && MAVEN_PROJECTBASEDIR=$(cygpath --path --windows "$MAVEN_PROJECTBASEDIR")
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $*"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+# shellcheck disable=SC2086 # safe args
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  $MAVEN_DEBUG_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"
diff --git a/mvnw.cmd b/mvnw.cmd
new file mode 100644
index 00000000000..8366e217043
--- /dev/null
+++ b/mvnw.cmd
@@ -0,0 +1,206 @@
+@REM 
----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    http://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM 
----------------------------------------------------------------------------
+
+@REM 
----------------------------------------------------------------------------
+@REM Apache Maven Wrapper startup batch script, version 3.3.4
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug 
-Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM 
----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd 
ending
+if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" 
%*
+if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" 
%*
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another 
setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo. >&2
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo. >&2
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo. >&2
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo. >&2
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder 
".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto 
endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do 
set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set 
WRAPPER_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.3.4/maven-wrapper-3.3.4.jar";
+
+FOR /F "usebackq tokens=1,2 delims==" %%A IN 
("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperUrl" SET WRAPPER_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from 
Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in 
binary data.
+if exist %WRAPPER_JAR% (
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Found %WRAPPER_JAR%
+    )
+) else (
+    if not "%MVNW_REPOURL%" == "" (
+        SET 
WRAPPER_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.3.4/maven-wrapper-3.3.4.jar"
+    )
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Couldn't find %WRAPPER_JAR%, downloading it ...
+        echo Downloading from: %WRAPPER_URL%
+    )
+
+    powershell -Command "&{"^
+               "$webclient = new-object System.Net.WebClient;"^
+               "if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and 
[string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+               "$webclient.Credentials = new-object 
System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+               "}"^
+               "[Net.ServicePointManager]::SecurityProtocol = 
[Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%WRAPPER_URL%', 
'%WRAPPER_JAR%')"^
+               "}"
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Finished downloading %WRAPPER_JAR%
+    )
+)
+@REM End of extension
+
+@REM If specified, validate the SHA-256 sum of the Maven wrapper jar file
+SET WRAPPER_SHA_256_SUM=""
+FOR /F "usebackq tokens=1,2 delims==" %%A IN 
("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperSha256Sum" SET WRAPPER_SHA_256_SUM=%%B
+)
+IF NOT %WRAPPER_SHA_256_SUM%=="" (
+    powershell -Command "&{"^
+       "Import-Module $PSHOME\Modules\Microsoft.PowerShell.Utility -Function 
Get-FileHash;"^
+       "$hash = (Get-FileHash \"%WRAPPER_JAR%\" -Algorithm 
SHA256).Hash.ToLower();"^
+       "If('%WRAPPER_SHA_256_SUM%' -ne $hash){"^
+       "  Write-Error 'Error: Failed to validate Maven wrapper SHA-256, your 
Maven wrapper might be compromised.';"^
+       "  Write-Error 'Investigate or delete %WRAPPER_JAR% to attempt a clean 
download.';"^
+       "  Write-Error 'If you updated your Maven version, you need to update 
the specified wrapperSha256Sum property.';"^
+       "  exit 1;"^
+       "}"^
+       "}"
+    if ERRORLEVEL 1 goto error
+)
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% ^
+  %JVM_CONFIG_MAVEN_PROPS% ^
+  %MAVEN_OPTS% ^
+  %MAVEN_DEBUG_OPTS% ^
+  -classpath %WRAPPER_JAR% ^
+  "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^
+  %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd 
ending
+if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat"
+if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%"=="on" pause
+
+if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE%
+
+cmd /C exit /B %ERROR_CODE%


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