diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000000000000000000000000000000000000..3b41682ac579fafb665abb4dfcdaa6aaaa712184
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+/mvnw text eol=lf
+*.cmd text eol=crlf
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..549e00a2a96fa9d7c5dbc9859664a78d980158c2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,33 @@
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### 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/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
diff --git a/.mvn/wrapper/maven-wrapper.properties b/.mvn/wrapper/maven-wrapper.properties
new file mode 100644
index 0000000000000000000000000000000000000000..d58dfb70bab565a697e6854eb012d17e0fd39bd4
--- /dev/null
+++ b/.mvn/wrapper/maven-wrapper.properties
@@ -0,0 +1,19 @@
+# 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=3.3.2
+distributionType=only-script
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.9/apache-maven-3.9.9-bin.zip
diff --git a/mvnw b/mvnw
new file mode 100644
index 0000000000000000000000000000000000000000..19529ddf8c6eaa08c5c75ff80652d21ce4b72f8c
--- /dev/null
+++ b/mvnw
@@ -0,0 +1,259 @@
+#!/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 3.3.2
+#
+# Optional ENV vars
+# -----------------
+#   JAVA_HOME - location of a JDK home dir, required when download maven via java source
+#   MVNW_REPOURL - repo url base for downloading maven distribution
+#   MVNW_USERNAME/MVNW_PASSWORD - user and password for downloading maven
+#   MVNW_VERBOSE - true: enable verbose log; debug: trace the mvnw script; others: silence the output
+# ----------------------------------------------------------------------------
+
+set -euf
+[ "${MVNW_VERBOSE-}" != debug ] || set -x
+
+# OS specific support.
+native_path() { printf %s\\n "$1"; }
+case "$(uname)" in
+CYGWIN* | MINGW*)
+  [ -z "${JAVA_HOME-}" ] || JAVA_HOME="$(cygpath --unix "$JAVA_HOME")"
+  native_path() { cygpath --path --windows "$1"; }
+  ;;
+esac
+
+# set JAVACMD and JAVACCMD
+set_java_home() {
+  # For Cygwin and MinGW, ensure paths are in Unix format before anything is touched
+  if [ -n "${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"
+      JAVACCMD="$JAVA_HOME/jre/sh/javac"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+      JAVACCMD="$JAVA_HOME/bin/javac"
+
+      if [ ! -x "$JAVACMD" ] || [ ! -x "$JAVACCMD" ]; then
+        echo "The JAVA_HOME environment variable is not defined correctly, so mvnw cannot run." >&2
+        echo "JAVA_HOME is set to \"$JAVA_HOME\", but \"\$JAVA_HOME/bin/java\" or \"\$JAVA_HOME/bin/javac\" does not exist." >&2
+        return 1
+      fi
+    fi
+  else
+    JAVACMD="$(
+      'set' +e
+      'unset' -f command 2>/dev/null
+      'command' -v java
+    )" || :
+    JAVACCMD="$(
+      'set' +e
+      'unset' -f command 2>/dev/null
+      'command' -v javac
+    )" || :
+
+    if [ ! -x "${JAVACMD-}" ] || [ ! -x "${JAVACCMD-}" ]; then
+      echo "The java/javac command does not exist in PATH nor is JAVA_HOME set, so mvnw cannot run." >&2
+      return 1
+    fi
+  fi
+}
+
+# hash string like Java String::hashCode
+hash_string() {
+  str="${1:-}" h=0
+  while [ -n "$str" ]; do
+    char="${str%"${str#?}"}"
+    h=$(((h * 31 + $(LC_CTYPE=C printf %d "'$char")) % 4294967296))
+    str="${str#?}"
+  done
+  printf %x\\n $h
+}
+
+verbose() { :; }
+[ "${MVNW_VERBOSE-}" != true ] || verbose() { printf %s\\n "${1-}"; }
+
+die() {
+  printf %s\\n "$1" >&2
+  exit 1
+}
+
+trim() {
+  # MWRAPPER-139:
+  #   Trims trailing and leading whitespace, carriage returns, tabs, and linefeeds.
+  #   Needed for removing poorly interpreted newline sequences when running in more
+  #   exotic environments such as mingw bash on Windows.
+  printf "%s" "${1}" | tr -d '[:space:]'
+}
+
+# parse distributionUrl and optional distributionSha256Sum, requires .mvn/wrapper/maven-wrapper.properties
+while IFS="=" read -r key value; do
+  case "${key-}" in
+  distributionUrl) distributionUrl=$(trim "${value-}") ;;
+  distributionSha256Sum) distributionSha256Sum=$(trim "${value-}") ;;
+  esac
+done <"${0%/*}/.mvn/wrapper/maven-wrapper.properties"
+[ -n "${distributionUrl-}" ] || die "cannot read distributionUrl property in ${0%/*}/.mvn/wrapper/maven-wrapper.properties"
+
+case "${distributionUrl##*/}" in
+maven-mvnd-*bin.*)
+  MVN_CMD=mvnd.sh _MVNW_REPO_PATTERN=/maven/mvnd/
+  case "${PROCESSOR_ARCHITECTURE-}${PROCESSOR_ARCHITEW6432-}:$(uname -a)" in
+  *AMD64:CYGWIN* | *AMD64:MINGW*) distributionPlatform=windows-amd64 ;;
+  :Darwin*x86_64) distributionPlatform=darwin-amd64 ;;
+  :Darwin*arm64) distributionPlatform=darwin-aarch64 ;;
+  :Linux*x86_64*) distributionPlatform=linux-amd64 ;;
+  *)
+    echo "Cannot detect native platform for mvnd on $(uname)-$(uname -m), use pure java version" >&2
+    distributionPlatform=linux-amd64
+    ;;
+  esac
+  distributionUrl="${distributionUrl%-bin.*}-$distributionPlatform.zip"
+  ;;
+maven-mvnd-*) MVN_CMD=mvnd.sh _MVNW_REPO_PATTERN=/maven/mvnd/ ;;
+*) MVN_CMD="mvn${0##*/mvnw}" _MVNW_REPO_PATTERN=/org/apache/maven/ ;;
+esac
+
+# apply MVNW_REPOURL and calculate MAVEN_HOME
+# maven home pattern: ~/.m2/wrapper/dists/{apache-maven-<version>,maven-mvnd-<version>-<platform>}/<hash>
+[ -z "${MVNW_REPOURL-}" ] || distributionUrl="$MVNW_REPOURL$_MVNW_REPO_PATTERN${distributionUrl#*"$_MVNW_REPO_PATTERN"}"
+distributionUrlName="${distributionUrl##*/}"
+distributionUrlNameMain="${distributionUrlName%.*}"
+distributionUrlNameMain="${distributionUrlNameMain%-bin}"
+MAVEN_USER_HOME="${MAVEN_USER_HOME:-${HOME}/.m2}"
+MAVEN_HOME="${MAVEN_USER_HOME}/wrapper/dists/${distributionUrlNameMain-}/$(hash_string "$distributionUrl")"
+
+exec_maven() {
+  unset MVNW_VERBOSE MVNW_USERNAME MVNW_PASSWORD MVNW_REPOURL || :
+  exec "$MAVEN_HOME/bin/$MVN_CMD" "$@" || die "cannot exec $MAVEN_HOME/bin/$MVN_CMD"
+}
+
+if [ -d "$MAVEN_HOME" ]; then
+  verbose "found existing MAVEN_HOME at $MAVEN_HOME"
+  exec_maven "$@"
+fi
+
+case "${distributionUrl-}" in
+*?-bin.zip | *?maven-mvnd-?*-?*.zip) ;;
+*) die "distributionUrl is not valid, must match *-bin.zip or maven-mvnd-*.zip, but found '${distributionUrl-}'" ;;
+esac
+
+# prepare tmp dir
+if TMP_DOWNLOAD_DIR="$(mktemp -d)" && [ -d "$TMP_DOWNLOAD_DIR" ]; then
+  clean() { rm -rf -- "$TMP_DOWNLOAD_DIR"; }
+  trap clean HUP INT TERM EXIT
+else
+  die "cannot create temp dir"
+fi
+
+mkdir -p -- "${MAVEN_HOME%/*}"
+
+# Download and Install Apache Maven
+verbose "Couldn't find MAVEN_HOME, downloading and installing it ..."
+verbose "Downloading from: $distributionUrl"
+verbose "Downloading to: $TMP_DOWNLOAD_DIR/$distributionUrlName"
+
+# select .zip or .tar.gz
+if ! command -v unzip >/dev/null; then
+  distributionUrl="${distributionUrl%.zip}.tar.gz"
+  distributionUrlName="${distributionUrl##*/}"
+fi
+
+# verbose opt
+__MVNW_QUIET_WGET=--quiet __MVNW_QUIET_CURL=--silent __MVNW_QUIET_UNZIP=-q __MVNW_QUIET_TAR=''
+[ "${MVNW_VERBOSE-}" != true ] || __MVNW_QUIET_WGET='' __MVNW_QUIET_CURL='' __MVNW_QUIET_UNZIP='' __MVNW_QUIET_TAR=v
+
+# normalize http auth
+case "${MVNW_PASSWORD:+has-password}" in
+'') MVNW_USERNAME='' MVNW_PASSWORD='' ;;
+has-password) [ -n "${MVNW_USERNAME-}" ] || MVNW_USERNAME='' MVNW_PASSWORD='' ;;
+esac
+
+if [ -z "${MVNW_USERNAME-}" ] && command -v wget >/dev/null; then
+  verbose "Found wget ... using wget"
+  wget ${__MVNW_QUIET_WGET:+"$__MVNW_QUIET_WGET"} "$distributionUrl" -O "$TMP_DOWNLOAD_DIR/$distributionUrlName" || die "wget: Failed to fetch $distributionUrl"
+elif [ -z "${MVNW_USERNAME-}" ] && command -v curl >/dev/null; then
+  verbose "Found curl ... using curl"
+  curl ${__MVNW_QUIET_CURL:+"$__MVNW_QUIET_CURL"} -f -L -o "$TMP_DOWNLOAD_DIR/$distributionUrlName" "$distributionUrl" || die "curl: Failed to fetch $distributionUrl"
+elif set_java_home; then
+  verbose "Falling back to use Java to download"
+  javaSource="$TMP_DOWNLOAD_DIR/Downloader.java"
+  targetZip="$TMP_DOWNLOAD_DIR/$distributionUrlName"
+  cat >"$javaSource" <<-END
+	public class Downloader extends java.net.Authenticator
+	{
+	  protected java.net.PasswordAuthentication getPasswordAuthentication()
+	  {
+	    return new java.net.PasswordAuthentication( System.getenv( "MVNW_USERNAME" ), System.getenv( "MVNW_PASSWORD" ).toCharArray() );
+	  }
+	  public static void main( String[] args ) throws Exception
+	  {
+	    setDefault( new Downloader() );
+	    java.nio.file.Files.copy( java.net.URI.create( args[0] ).toURL().openStream(), java.nio.file.Paths.get( args[1] ).toAbsolutePath().normalize() );
+	  }
+	}
+	END
+  # For Cygwin/MinGW, switch paths to Windows format before running javac and java
+  verbose " - Compiling Downloader.java ..."
+  "$(native_path "$JAVACCMD")" "$(native_path "$javaSource")" || die "Failed to compile Downloader.java"
+  verbose " - Running Downloader.java ..."
+  "$(native_path "$JAVACMD")" -cp "$(native_path "$TMP_DOWNLOAD_DIR")" Downloader "$distributionUrl" "$(native_path "$targetZip")"
+fi
+
+# If specified, validate the SHA-256 sum of the Maven distribution zip file
+if [ -n "${distributionSha256Sum-}" ]; then
+  distributionSha256Result=false
+  if [ "$MVN_CMD" = mvnd.sh ]; then
+    echo "Checksum validation is not supported for maven-mvnd." >&2
+    echo "Please disable validation by removing 'distributionSha256Sum' from your maven-wrapper.properties." >&2
+    exit 1
+  elif command -v sha256sum >/dev/null; then
+    if echo "$distributionSha256Sum  $TMP_DOWNLOAD_DIR/$distributionUrlName" | sha256sum -c >/dev/null 2>&1; then
+      distributionSha256Result=true
+    fi
+  elif command -v shasum >/dev/null; then
+    if echo "$distributionSha256Sum  $TMP_DOWNLOAD_DIR/$distributionUrlName" | shasum -a 256 -c >/dev/null 2>&1; then
+      distributionSha256Result=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 'distributionSha256Sum' from your maven-wrapper.properties." >&2
+    exit 1
+  fi
+  if [ $distributionSha256Result = false ]; then
+    echo "Error: Failed to validate Maven distribution SHA-256, your Maven distribution might be compromised." >&2
+    echo "If you updated your Maven version, you need to update the specified distributionSha256Sum property." >&2
+    exit 1
+  fi
+fi
+
+# unzip and move
+if command -v unzip >/dev/null; then
+  unzip ${__MVNW_QUIET_UNZIP:+"$__MVNW_QUIET_UNZIP"} "$TMP_DOWNLOAD_DIR/$distributionUrlName" -d "$TMP_DOWNLOAD_DIR" || die "failed to unzip"
+else
+  tar xzf${__MVNW_QUIET_TAR:+"$__MVNW_QUIET_TAR"} "$TMP_DOWNLOAD_DIR/$distributionUrlName" -C "$TMP_DOWNLOAD_DIR" || die "failed to untar"
+fi
+printf %s\\n "$distributionUrl" >"$TMP_DOWNLOAD_DIR/$distributionUrlNameMain/mvnw.url"
+mv -- "$TMP_DOWNLOAD_DIR/$distributionUrlNameMain" "$MAVEN_HOME" || [ -d "$MAVEN_HOME" ] || die "fail to move MAVEN_HOME"
+
+clean || :
+exec_maven "$@"
diff --git a/mvnw.cmd b/mvnw.cmd
new file mode 100644
index 0000000000000000000000000000000000000000..249bdf3822221aa612d1da2605316cabd7b07e50
--- /dev/null
+++ b/mvnw.cmd
@@ -0,0 +1,149 @@
+<# : batch portion
+@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 3.3.2
+@REM
+@REM Optional ENV vars
+@REM   MVNW_REPOURL - repo url base for downloading maven distribution
+@REM   MVNW_USERNAME/MVNW_PASSWORD - user and password for downloading maven
+@REM   MVNW_VERBOSE - true: enable verbose log; others: silence the output
+@REM ----------------------------------------------------------------------------
+
+@IF "%__MVNW_ARG0_NAME__%"=="" (SET __MVNW_ARG0_NAME__=%~nx0)
+@SET __MVNW_CMD__=
+@SET __MVNW_ERROR__=
+@SET __MVNW_PSMODULEP_SAVE=%PSModulePath%
+@SET PSModulePath=
+@FOR /F "usebackq tokens=1* delims==" %%A IN (`powershell -noprofile "& {$scriptDir='%~dp0'; $script='%__MVNW_ARG0_NAME__%'; icm -ScriptBlock ([Scriptblock]::Create((Get-Content -Raw '%~f0'))) -NoNewScope}"`) DO @(
+  IF "%%A"=="MVN_CMD" (set __MVNW_CMD__=%%B) ELSE IF "%%B"=="" (echo %%A) ELSE (echo %%A=%%B)
+)
+@SET PSModulePath=%__MVNW_PSMODULEP_SAVE%
+@SET __MVNW_PSMODULEP_SAVE=
+@SET __MVNW_ARG0_NAME__=
+@SET MVNW_USERNAME=
+@SET MVNW_PASSWORD=
+@IF NOT "%__MVNW_CMD__%"=="" (%__MVNW_CMD__% %*)
+@echo Cannot start maven from wrapper >&2 && exit /b 1
+@GOTO :EOF
+: end batch / begin powershell #>
+
+$ErrorActionPreference = "Stop"
+if ($env:MVNW_VERBOSE -eq "true") {
+  $VerbosePreference = "Continue"
+}
+
+# calculate distributionUrl, requires .mvn/wrapper/maven-wrapper.properties
+$distributionUrl = (Get-Content -Raw "$scriptDir/.mvn/wrapper/maven-wrapper.properties" | ConvertFrom-StringData).distributionUrl
+if (!$distributionUrl) {
+  Write-Error "cannot read distributionUrl property in $scriptDir/.mvn/wrapper/maven-wrapper.properties"
+}
+
+switch -wildcard -casesensitive ( $($distributionUrl -replace '^.*/','') ) {
+  "maven-mvnd-*" {
+    $USE_MVND = $true
+    $distributionUrl = $distributionUrl -replace '-bin\.[^.]*$',"-windows-amd64.zip"
+    $MVN_CMD = "mvnd.cmd"
+    break
+  }
+  default {
+    $USE_MVND = $false
+    $MVN_CMD = $script -replace '^mvnw','mvn'
+    break
+  }
+}
+
+# apply MVNW_REPOURL and calculate MAVEN_HOME
+# maven home pattern: ~/.m2/wrapper/dists/{apache-maven-<version>,maven-mvnd-<version>-<platform>}/<hash>
+if ($env:MVNW_REPOURL) {
+  $MVNW_REPO_PATTERN = if ($USE_MVND) { "/org/apache/maven/" } else { "/maven/mvnd/" }
+  $distributionUrl = "$env:MVNW_REPOURL$MVNW_REPO_PATTERN$($distributionUrl -replace '^.*'+$MVNW_REPO_PATTERN,'')"
+}
+$distributionUrlName = $distributionUrl -replace '^.*/',''
+$distributionUrlNameMain = $distributionUrlName -replace '\.[^.]*$','' -replace '-bin$',''
+$MAVEN_HOME_PARENT = "$HOME/.m2/wrapper/dists/$distributionUrlNameMain"
+if ($env:MAVEN_USER_HOME) {
+  $MAVEN_HOME_PARENT = "$env:MAVEN_USER_HOME/wrapper/dists/$distributionUrlNameMain"
+}
+$MAVEN_HOME_NAME = ([System.Security.Cryptography.MD5]::Create().ComputeHash([byte[]][char[]]$distributionUrl) | ForEach-Object {$_.ToString("x2")}) -join ''
+$MAVEN_HOME = "$MAVEN_HOME_PARENT/$MAVEN_HOME_NAME"
+
+if (Test-Path -Path "$MAVEN_HOME" -PathType Container) {
+  Write-Verbose "found existing MAVEN_HOME at $MAVEN_HOME"
+  Write-Output "MVN_CMD=$MAVEN_HOME/bin/$MVN_CMD"
+  exit $?
+}
+
+if (! $distributionUrlNameMain -or ($distributionUrlName -eq $distributionUrlNameMain)) {
+  Write-Error "distributionUrl is not valid, must end with *-bin.zip, but found $distributionUrl"
+}
+
+# prepare tmp dir
+$TMP_DOWNLOAD_DIR_HOLDER = New-TemporaryFile
+$TMP_DOWNLOAD_DIR = New-Item -Itemtype Directory -Path "$TMP_DOWNLOAD_DIR_HOLDER.dir"
+$TMP_DOWNLOAD_DIR_HOLDER.Delete() | Out-Null
+trap {
+  if ($TMP_DOWNLOAD_DIR.Exists) {
+    try { Remove-Item $TMP_DOWNLOAD_DIR -Recurse -Force | Out-Null }
+    catch { Write-Warning "Cannot remove $TMP_DOWNLOAD_DIR" }
+  }
+}
+
+New-Item -Itemtype Directory -Path "$MAVEN_HOME_PARENT" -Force | Out-Null
+
+# Download and Install Apache Maven
+Write-Verbose "Couldn't find MAVEN_HOME, downloading and installing it ..."
+Write-Verbose "Downloading from: $distributionUrl"
+Write-Verbose "Downloading to: $TMP_DOWNLOAD_DIR/$distributionUrlName"
+
+$webclient = New-Object System.Net.WebClient
+if ($env:MVNW_USERNAME -and $env:MVNW_PASSWORD) {
+  $webclient.Credentials = New-Object System.Net.NetworkCredential($env:MVNW_USERNAME, $env:MVNW_PASSWORD)
+}
+[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+$webclient.DownloadFile($distributionUrl, "$TMP_DOWNLOAD_DIR/$distributionUrlName") | Out-Null
+
+# If specified, validate the SHA-256 sum of the Maven distribution zip file
+$distributionSha256Sum = (Get-Content -Raw "$scriptDir/.mvn/wrapper/maven-wrapper.properties" | ConvertFrom-StringData).distributionSha256Sum
+if ($distributionSha256Sum) {
+  if ($USE_MVND) {
+    Write-Error "Checksum validation is not supported for maven-mvnd. `nPlease disable validation by removing 'distributionSha256Sum' from your maven-wrapper.properties."
+  }
+  Import-Module $PSHOME\Modules\Microsoft.PowerShell.Utility -Function Get-FileHash
+  if ((Get-FileHash "$TMP_DOWNLOAD_DIR/$distributionUrlName" -Algorithm SHA256).Hash.ToLower() -ne $distributionSha256Sum) {
+    Write-Error "Error: Failed to validate Maven distribution SHA-256, your Maven distribution might be compromised. If you updated your Maven version, you need to update the specified distributionSha256Sum property."
+  }
+}
+
+# unzip and move
+Expand-Archive "$TMP_DOWNLOAD_DIR/$distributionUrlName" -DestinationPath "$TMP_DOWNLOAD_DIR" | Out-Null
+Rename-Item -Path "$TMP_DOWNLOAD_DIR/$distributionUrlNameMain" -NewName $MAVEN_HOME_NAME | Out-Null
+try {
+  Move-Item -Path "$TMP_DOWNLOAD_DIR/$MAVEN_HOME_NAME" -Destination $MAVEN_HOME_PARENT | Out-Null
+} catch {
+  if (! (Test-Path -Path "$MAVEN_HOME" -PathType Container)) {
+    Write-Error "fail to move MAVEN_HOME"
+  }
+} finally {
+  try { Remove-Item $TMP_DOWNLOAD_DIR -Recurse -Force | Out-Null }
+  catch { Write-Warning "Cannot remove $TMP_DOWNLOAD_DIR" }
+}
+
+Write-Output "MVN_CMD=$MAVEN_HOME/bin/$MVN_CMD"
diff --git a/pom.xml b/pom.xml
new file mode 100644
index 0000000000000000000000000000000000000000..8944b776b5546425b0572f64588f169e57d9cdc9
--- /dev/null
+++ b/pom.xml
@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>3.4.3</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <groupId>com.example</groupId>
+    <artifactId>GestionStagesBackend</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>GestionStagesBackend</name>
+    <description>GestionStagesBackend</description>
+    <url/>
+    <licenses>
+        <license/>
+    </licenses>
+    <developers>
+        <developer/>
+    </developers>
+    <scm>
+        <connection/>
+        <developerConnection/>
+        <tag/>
+        <url/>
+    </scm>
+    <properties>
+        <java.version>17</java.version>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-security</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-thymeleaf</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.thymeleaf.extras</groupId>
+            <artifactId>thymeleaf-extras-springsecurity6</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-devtools</artifactId>
+            <scope>runtime</scope>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.security</groupId>
+            <artifactId>spring-security-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-security</artifactId>
+        </dependency>
+
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>org.projectlombok</groupId>
+                            <artifactId>lombok</artifactId>
+                        </path>
+                    </annotationProcessorPaths>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <configuration>
+                    <excludes>
+                        <exclude>
+                            <groupId>org.projectlombok</groupId>
+                            <artifactId>lombok</artifactId>
+                        </exclude>
+                    </excludes>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
diff --git a/src/main/java/com/example/gestionstagesbackend/Config/SecurityConfig.java b/src/main/java/com/example/gestionstagesbackend/Config/SecurityConfig.java
new file mode 100644
index 0000000000000000000000000000000000000000..c62e15076c3ccd3090caaae18020190a729675fe
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/Config/SecurityConfig.java
@@ -0,0 +1,22 @@
+package com.example.gestionstagesbackend.Config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.web.SecurityFilterChain;
+
+@Configuration
+public class SecurityConfig {
+
+    @Bean
+    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
+        http
+                .authorizeHttpRequests(auth -> auth
+                        .requestMatchers("/api/**").permitAll()  // Allow all API calls
+                        .anyRequest().authenticated()           // Require authentication for other requests
+                )
+                .csrf(csrf -> csrf.disable()); // Disable CSRF for testing
+
+        return http.build();
+    }
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/GestionStagesBackendApplication.java b/src/main/java/com/example/gestionstagesbackend/GestionStagesBackendApplication.java
new file mode 100644
index 0000000000000000000000000000000000000000..23df20b096ad025ec89048496cd3cfcc8ff8f351
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/GestionStagesBackendApplication.java
@@ -0,0 +1,19 @@
+package com.example.gestionstagesbackend;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+
+@SpringBootApplication
+public class GestionStagesBackendApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(GestionStagesBackendApplication.class, args);
+    }
+
+    @Bean
+    public BCryptPasswordEncoder passwordEncoder() {
+        return new BCryptPasswordEncoder();
+    }
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/controllers/CandidacyController.java b/src/main/java/com/example/gestionstagesbackend/controllers/CandidacyController.java
new file mode 100644
index 0000000000000000000000000000000000000000..6861e1ddf847495a6b3737954aded7eedb4cafb2
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/controllers/CandidacyController.java
@@ -0,0 +1,40 @@
+package com.example.gestionstagesbackend.controllers;
+
+
+
+import com.example.gestionstagesbackend.model.Candidacy;
+import com.example.gestionstagesbackend.services.CandidacyService;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+import java.util.Optional;
+
+@RestController
+@RequestMapping("/api/candidacies")
+public class CandidacyController {
+    private final CandidacyService candidacyService;
+
+    public CandidacyController(CandidacyService candidacyService) {
+        this.candidacyService = candidacyService;
+    }
+
+    @GetMapping
+    public List<Candidacy> getAllCandidacies() {
+        return candidacyService.getAllCandidacies();
+    }
+
+    @GetMapping("/{id}")
+    public Optional<Candidacy> getCandidacyById(@PathVariable Long id) {
+        return candidacyService.getCandidacyById(id);
+    }
+
+    @PostMapping
+    public Candidacy saveCandidacy(@RequestBody Candidacy candidacy) {
+        return candidacyService.saveCandidacy(candidacy);
+    }
+
+    @DeleteMapping("/{id}")
+    public void deleteCandidacy(@PathVariable Long id) {
+        candidacyService.deleteCandidacy(id);
+    }
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/controllers/EnterpriseController.java b/src/main/java/com/example/gestionstagesbackend/controllers/EnterpriseController.java
new file mode 100644
index 0000000000000000000000000000000000000000..aa09befcfdc5a8e1d32c667b71617078ccaf9fc8
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/controllers/EnterpriseController.java
@@ -0,0 +1,40 @@
+package com.example.gestionstagesbackend.controllers;
+
+
+
+import com.example.gestionstagesbackend.model.Enterprise;
+import com.example.gestionstagesbackend.services.EnterpriseService;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+import java.util.Optional;
+
+@RestController
+@RequestMapping("/api/enterprises")
+public class EnterpriseController {
+    private final EnterpriseService enterpriseService;
+
+    public EnterpriseController(EnterpriseService enterpriseService) {
+        this.enterpriseService = enterpriseService;
+    }
+
+    @GetMapping
+    public List<Enterprise> getAllEnterprises() {
+        return enterpriseService.getAllEnterprises();
+    }
+
+    @GetMapping("/{id}")
+    public Optional<Enterprise> getEnterpriseById(@PathVariable Long id) {
+        return enterpriseService.getEnterpriseById(id);
+    }
+
+    @PostMapping
+    public Enterprise saveEnterprise(@RequestBody Enterprise enterprise) {
+        return enterpriseService.saveEnterprise(enterprise);
+    }
+
+    @DeleteMapping("/{id}")
+    public void deleteEnterprise(@PathVariable Long id) {
+        enterpriseService.deleteEnterprise(id);
+    }
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/controllers/StudentController.java b/src/main/java/com/example/gestionstagesbackend/controllers/StudentController.java
new file mode 100644
index 0000000000000000000000000000000000000000..af799250469988b6da3c48361efef5f8f1196398
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/controllers/StudentController.java
@@ -0,0 +1,44 @@
+package com.example.gestionstagesbackend.controllers;
+
+import com.example.gestionstagesbackend.model.Student;
+import com.example.gestionstagesbackend.services.StudentService;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+import java.util.Optional;
+
+@RestController
+@RequestMapping("/api/students")
+public class StudentController {
+
+    private final StudentService studentService;
+
+    public StudentController(StudentService studentService) {
+        this.studentService = studentService;
+    }
+
+    @GetMapping
+    public List<Student> getAllStudents() {
+        return studentService.getAllStudents();
+    }
+
+    @GetMapping("/{id}")
+    public Optional<Student> getStudentById(@PathVariable Long id) {
+        return studentService.getStudentById(id);
+    }
+
+    @PostMapping
+    public Student saveStudent(@RequestBody Student student) {
+        return studentService.saveStudent(student);
+    }
+
+    @PutMapping("/{id}")
+    public Student updateStudent(@PathVariable Long id, @RequestBody Student studentDetails) {
+        return studentService.updateStudent(id, studentDetails);
+    }
+
+    @DeleteMapping("/{id}")
+    public void deleteStudent(@PathVariable Long id) {
+        studentService.deleteStudent(id);
+    }
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/enums/AcceptedCandidacyStateKind.java b/src/main/java/com/example/gestionstagesbackend/enums/AcceptedCandidacyStateKind.java
new file mode 100644
index 0000000000000000000000000000000000000000..6dcf5a100db33658c13bb2efa9dfa885317dcc7a
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/enums/AcceptedCandidacyStateKind.java
@@ -0,0 +1,8 @@
+package com.example.gestionstagesbackend.enums;
+
+
+public enum AcceptedCandidacyStateKind {
+    wait,
+    inProgress,
+    terminated
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/enums/CandidacyRequestState.java b/src/main/java/com/example/gestionstagesbackend/enums/CandidacyRequestState.java
new file mode 100644
index 0000000000000000000000000000000000000000..a46d1e3d7f9d521b9a7930d458567dfa993343de
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/enums/CandidacyRequestState.java
@@ -0,0 +1,8 @@
+package com.example.gestionstagesbackend.enums;
+
+
+public enum CandidacyRequestState {
+    FirstRequest,
+    Accepted,
+    Declined
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/model/Candidacy.java b/src/main/java/com/example/gestionstagesbackend/model/Candidacy.java
new file mode 100644
index 0000000000000000000000000000000000000000..ea5f3787b6750745621b9b925f585900947134fa
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/model/Candidacy.java
@@ -0,0 +1,99 @@
+package com.example.gestionstagesbackend.model;
+
+
+import com.example.gestionstagesbackend.enums.AcceptedCandidacyStateKind;
+import com.example.gestionstagesbackend.enums.CandidacyRequestState;
+import jakarta.persistence.*;
+
+@Entity
+public class Candidacy {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    private String name;
+
+    @Enumerated(EnumType.STRING)
+    private CandidacyRequestState requestState;
+
+    @Enumerated(EnumType.STRING)
+    private AcceptedCandidacyStateKind acceptedCandidacyState;
+
+    @ManyToOne
+    private UnivSupervisor univSupervisor;
+
+    @ManyToOne
+    private Student student;
+
+    @ManyToOne
+    private Stage stage;
+
+    public Candidacy(Long id, String name, CandidacyRequestState requestState, AcceptedCandidacyStateKind acceptedCandidacyState, UnivSupervisor univSupervisor, Student student, Stage stage) {
+        this.id = id;
+        this.name = name;
+        this.requestState = requestState;
+        this.acceptedCandidacyState = acceptedCandidacyState;
+        this.univSupervisor = univSupervisor;
+        this.student = student;
+        this.stage = stage;
+    }
+
+    public Candidacy() {
+
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public CandidacyRequestState getRequestState() {
+        return requestState;
+    }
+
+    public void setRequestState(CandidacyRequestState requestState) {
+        this.requestState = requestState;
+    }
+
+    public AcceptedCandidacyStateKind getAcceptedCandidacyState() {
+        return acceptedCandidacyState;
+    }
+
+    public void setAcceptedCandidacyState(AcceptedCandidacyStateKind acceptedCandidacyState) {
+        this.acceptedCandidacyState = acceptedCandidacyState;
+    }
+
+    public UnivSupervisor getUnivSupervisor() {
+        return univSupervisor;
+    }
+
+    public void setUnivSupervisor(UnivSupervisor univSupervisor) {
+        this.univSupervisor = univSupervisor;
+    }
+
+    public Student getStudent() {
+        return student;
+    }
+
+    public void setStudent(Student student) {
+        this.student = student;
+    }
+
+    public Stage getStage() {
+        return stage;
+    }
+
+    public void setStage(Stage stage) {
+        this.stage = stage;
+    }
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/model/Enterprise.java b/src/main/java/com/example/gestionstagesbackend/model/Enterprise.java
new file mode 100644
index 0000000000000000000000000000000000000000..7aeb3f5716a9ecc694f212b3a6d295793e029918
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/model/Enterprise.java
@@ -0,0 +1,27 @@
+package com.example.gestionstagesbackend.model;
+
+import jakarta.persistence.*;
+
+
+import java.util.Set;
+
+@Entity
+public class Enterprise {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    private String name;
+    private String address;
+
+    @OneToMany(mappedBy = "enterprise", cascade = CascadeType.ALL)
+    private Set<Stage> stages;
+
+    public Long getId() { return id; }
+    public void setId(Long id) { this.id = id; }
+    public String getName() { return name; }
+    public void setName(String name) { this.name = name; }
+    public String getAddress() { return address; }
+    public void setAddress(String address) { this.address = address; }
+    public Set<Stage> getStages() { return stages; }
+    public void setStages(Set<Stage> stages) { this.stages = stages; }
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/gestionstagesbackend/model/Stage.java b/src/main/java/com/example/gestionstagesbackend/model/Stage.java
new file mode 100644
index 0000000000000000000000000000000000000000..5155a7d64ec55a480664e81ad21cdf5ebf91ac98
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/model/Stage.java
@@ -0,0 +1,61 @@
+package com.example.gestionstagesbackend.model;
+
+
+import jakarta.persistence.*;
+import java.util.List;
+
+@Entity
+public class Stage {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    private String name;
+    private String description;
+
+    @ManyToOne
+    private Enterprise enterprise;
+
+    @OneToMany(mappedBy = "stage", cascade = CascadeType.ALL)
+    private List<Candidacy> candidacies;
+
+    public Stage(Long id, String name, String description, Enterprise enterprise) {
+        this.id = id;
+        this.name = name;
+        this.description = description;
+        this.enterprise = enterprise;
+    }
+
+    public Stage() {}
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public Enterprise getEnterprise() {
+        return enterprise;
+    }
+
+    public void setEnterprise(Enterprise enterprise) {
+        this.enterprise = enterprise;
+    }
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/model/Student.java b/src/main/java/com/example/gestionstagesbackend/model/Student.java
new file mode 100644
index 0000000000000000000000000000000000000000..949bb22afa36e15ddcbbbe27ff4658799301750e
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/model/Student.java
@@ -0,0 +1,38 @@
+package com.example.gestionstagesbackend.model;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import jakarta.persistence.*;
+import java.util.List;
+
+@Entity
+public class Student {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    private String firstname;
+    private String lastname;
+
+    @OneToMany(mappedBy = "student", cascade = CascadeType.ALL)
+    @JsonIgnore // Prevents infinite recursion when returning JSON
+    private List<Candidacy> candidacies;
+
+    public Student() {}
+
+    public Student(Long id, String firstname, String lastname) {
+        this.id = id;
+        this.firstname = firstname;
+        this.lastname = lastname;
+    }
+
+    public Long getId() { return id; }
+    public void setId(Long id) { this.id = id; }
+
+    public String getFirstname() { return firstname; }
+    public void setFirstname(String firstname) { this.firstname = firstname; }
+
+    public String getLastname() { return lastname; }
+    public void setLastname(String lastname) { this.lastname = lastname; }
+
+    public List<Candidacy> getCandidacies() { return candidacies; }
+    public void setCandidacies(List<Candidacy> candidacies) { this.candidacies = candidacies; }
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/model/UnivSupervisor.java b/src/main/java/com/example/gestionstagesbackend/model/UnivSupervisor.java
new file mode 100644
index 0000000000000000000000000000000000000000..1a9c4c286f323dc903ef45611dc119e16fc22be9
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/model/UnivSupervisor.java
@@ -0,0 +1,61 @@
+package com.example.gestionstagesbackend.model;
+
+
+import jakarta.persistence.*;
+import java.util.List;
+
+@Entity
+public class UnivSupervisor {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    private String firstname;
+    private String lastname;
+
+    @OneToMany(mappedBy = "univSupervisor", cascade = CascadeType.ALL)
+    private List<Candidacy> supervisedStages;
+
+    public UnivSupervisor(Long id, String firstname, String lastname, List<Candidacy> supervisedStages) {
+        this.id = id;
+        this.firstname = firstname;
+        this.lastname = lastname;
+        this.supervisedStages = supervisedStages;
+    }
+
+    public UnivSupervisor() {
+
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getFirstname() {
+        return firstname;
+    }
+
+    public void setFirstname(String firstname) {
+        this.firstname = firstname;
+    }
+
+    public String getLastname() {
+        return lastname;
+    }
+
+    public void setLastname(String lastname) {
+        this.lastname = lastname;
+    }
+
+    public List<Candidacy> getSupervisedStages() {
+        return supervisedStages;
+    }
+
+    public void setSupervisedStages(List<Candidacy> supervisedStages) {
+        this.supervisedStages = supervisedStages;
+    }
+    // Constructors, Getters, Setters
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/repositories/CandidacyRepository.java b/src/main/java/com/example/gestionstagesbackend/repositories/CandidacyRepository.java
new file mode 100644
index 0000000000000000000000000000000000000000..1f4a52ab97c6c4d13c7ea6edf79f278ce33090cc
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/repositories/CandidacyRepository.java
@@ -0,0 +1,8 @@
+package com.example.gestionstagesbackend.repositories;
+
+
+import com.example.gestionstagesbackend.model.Candidacy;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface CandidacyRepository extends JpaRepository<Candidacy, Long> {
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/repositories/EnterpriseRepository.java b/src/main/java/com/example/gestionstagesbackend/repositories/EnterpriseRepository.java
new file mode 100644
index 0000000000000000000000000000000000000000..abfb39d6c1f5ce0e6255c52b1922e9e7874714c0
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/repositories/EnterpriseRepository.java
@@ -0,0 +1,8 @@
+package com.example.gestionstagesbackend.repositories;
+
+
+import com.example.gestionstagesbackend.model.Enterprise;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface EnterpriseRepository extends JpaRepository<Enterprise, Long> {
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/repositories/StudentRepository.java b/src/main/java/com/example/gestionstagesbackend/repositories/StudentRepository.java
new file mode 100644
index 0000000000000000000000000000000000000000..e7474ad53c65a21b8c7aa4227673559831c6c668
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/repositories/StudentRepository.java
@@ -0,0 +1,9 @@
+package com.example.gestionstagesbackend.repositories;
+
+import com.example.gestionstagesbackend.model.Student;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface StudentRepository extends JpaRepository<Student, Long> {
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/repositories/UnivSupervisorRepository.java b/src/main/java/com/example/gestionstagesbackend/repositories/UnivSupervisorRepository.java
new file mode 100644
index 0000000000000000000000000000000000000000..5d5951c9615b325b5d2bcd614e553212084d44f3
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/repositories/UnivSupervisorRepository.java
@@ -0,0 +1,8 @@
+package com.example.gestionstagesbackend.repositories;
+
+
+import com.example.gestionstagesbackend.model.UnivSupervisor;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface UnivSupervisorRepository extends JpaRepository<UnivSupervisor, Long> {
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/services/CandidacyService.java b/src/main/java/com/example/gestionstagesbackend/services/CandidacyService.java
new file mode 100644
index 0000000000000000000000000000000000000000..b28240826ec9f46484efa8c269396f879f800e07
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/services/CandidacyService.java
@@ -0,0 +1,34 @@
+package com.example.gestionstagesbackend.services;
+
+
+
+import com.example.gestionstagesbackend.model.Candidacy;
+import com.example.gestionstagesbackend.repositories.CandidacyRepository;
+import org.springframework.stereotype.Service;
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class CandidacyService {
+    private final CandidacyRepository candidacyRepository;
+
+    public CandidacyService(CandidacyRepository candidacyRepository) {
+        this.candidacyRepository = candidacyRepository;
+    }
+
+    public List<Candidacy> getAllCandidacies() {
+        return candidacyRepository.findAll();
+    }
+
+    public Optional<Candidacy> getCandidacyById(Long id) {
+        return candidacyRepository.findById(id);
+    }
+
+    public Candidacy saveCandidacy(Candidacy candidacy) {
+        return candidacyRepository.save(candidacy);
+    }
+
+    public void deleteCandidacy(Long id) {
+        candidacyRepository.deleteById(id);
+    }
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/services/EnterpriseService.java b/src/main/java/com/example/gestionstagesbackend/services/EnterpriseService.java
new file mode 100644
index 0000000000000000000000000000000000000000..a1313996fd9ad7a625a8dcd8319319a26301e31b
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/services/EnterpriseService.java
@@ -0,0 +1,34 @@
+package com.example.gestionstagesbackend.services;
+
+
+
+import com.example.gestionstagesbackend.model.Enterprise;
+import com.example.gestionstagesbackend.repositories.EnterpriseRepository;
+import org.springframework.stereotype.Service;
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class EnterpriseService {
+    private final EnterpriseRepository enterpriseRepository;
+
+    public EnterpriseService(EnterpriseRepository enterpriseRepository) {
+        this.enterpriseRepository = enterpriseRepository;
+    }
+
+    public List<Enterprise> getAllEnterprises() {
+        return enterpriseRepository.findAll();
+    }
+
+    public Optional<Enterprise> getEnterpriseById(Long id) {
+        return enterpriseRepository.findById(id);
+    }
+
+    public Enterprise saveEnterprise(Enterprise enterprise) {
+        return enterpriseRepository.save(enterprise);
+    }
+
+    public void deleteEnterprise(Long id) {
+        enterpriseRepository.deleteById(id);
+    }
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/services/StudentService.java b/src/main/java/com/example/gestionstagesbackend/services/StudentService.java
new file mode 100644
index 0000000000000000000000000000000000000000..8d9c9ca970fc20b12ad633b5db81e0a6868388ea
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/services/StudentService.java
@@ -0,0 +1,42 @@
+package com.example.gestionstagesbackend.services;
+
+import com.example.gestionstagesbackend.model.Student;
+import com.example.gestionstagesbackend.repositories.StudentRepository;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class StudentService {
+
+    private final StudentRepository studentRepository;
+
+    public StudentService(StudentRepository studentRepository) {
+        this.studentRepository = studentRepository;
+    }
+
+    public List<Student> getAllStudents() {
+        return studentRepository.findAll();
+    }
+
+    public Optional<Student> getStudentById(Long id) {
+        return studentRepository.findById(id);
+    }
+
+    public Student saveStudent(Student student) {
+        return studentRepository.save(student);
+    }
+
+    public Student updateStudent(Long id, Student studentDetails) {
+        return studentRepository.findById(id).map(student -> {
+            student.setFirstname(studentDetails.getFirstname());
+            student.setLastname(studentDetails.getLastname());
+            return studentRepository.save(student);
+        }).orElseThrow(() -> new RuntimeException("Student not found with id " + id));
+    }
+
+    public void deleteStudent(Long id) {
+        studentRepository.deleteById(id);
+    }
+}
diff --git a/src/main/java/com/example/gestionstagesbackend/services/UnivSupervisorService.java b/src/main/java/com/example/gestionstagesbackend/services/UnivSupervisorService.java
new file mode 100644
index 0000000000000000000000000000000000000000..fa10f8887b68cc5163da614042816953b4164da4
--- /dev/null
+++ b/src/main/java/com/example/gestionstagesbackend/services/UnivSupervisorService.java
@@ -0,0 +1,34 @@
+package com.example.gestionstagesbackend.services;
+
+
+
+import com.example.gestionstagesbackend.model.UnivSupervisor;
+import com.example.gestionstagesbackend.repositories.UnivSupervisorRepository;
+import org.springframework.stereotype.Service;
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class UnivSupervisorService {
+    private final UnivSupervisorRepository univSupervisorRepository;
+
+    public UnivSupervisorService(UnivSupervisorRepository univSupervisorRepository) {
+        this.univSupervisorRepository = univSupervisorRepository;
+    }
+
+    public List<UnivSupervisor> getAllSupervisors() {
+        return univSupervisorRepository.findAll();
+    }
+
+    public Optional<UnivSupervisor> getSupervisorById(Long id) {
+        return univSupervisorRepository.findById(id);
+    }
+
+    public UnivSupervisor saveSupervisor(UnivSupervisor univSupervisor) {
+        return univSupervisorRepository.save(univSupervisor);
+    }
+
+    public void deleteSupervisor(Long id) {
+        univSupervisorRepository.deleteById(id);
+    }
+}
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
new file mode 100644
index 0000000000000000000000000000000000000000..dd41f4575beb2cd363a990fc887a3c12b394b2d4
--- /dev/null
+++ b/src/main/resources/application.properties
@@ -0,0 +1,7 @@
+spring.application.name=GestionStagesBackend
+spring.datasource.url=jdbc:h2:mem:gestionstagesdb
+spring.datasource.driver-class-name=org.h2.Driver
+spring.datasource.username=sa
+spring.datasource.password=
+spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
+spring.h2.console.enabled=true
diff --git a/src/test/java/com/example/gestionstagesbackend/GestionStagesBackendApplicationTests.java b/src/test/java/com/example/gestionstagesbackend/GestionStagesBackendApplicationTests.java
new file mode 100644
index 0000000000000000000000000000000000000000..3604b282e4394eb35221496c74721c00251c212c
--- /dev/null
+++ b/src/test/java/com/example/gestionstagesbackend/GestionStagesBackendApplicationTests.java
@@ -0,0 +1,13 @@
+package com.example.gestionstagesbackend;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class GestionStagesBackendApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}