diff --git a/JavaBackEnd288/backend-programming/.DS_Store b/JavaBackEnd288/backend-programming/.DS_Store
new file mode 100644
index 0000000..07e1407
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diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch(1).zip b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch(1).zip
new file mode 100644
index 0000000..9c9c595
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diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/.gitattributes b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/.gitattributes
new file mode 100644
index 0000000..3b41682
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/.gitattributes
@@ -0,0 +1,2 @@
+/mvnw text eol=lf
+*.cmd text eol=crlf
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/.gitignore b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/.gitignore
new file mode 100644
index 0000000..667aaef
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/.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/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/.mvn/wrapper/maven-wrapper.properties b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/.mvn/wrapper/maven-wrapper.properties
new file mode 100644
index 0000000..8dea6c2
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/.mvn/wrapper/maven-wrapper.properties
@@ -0,0 +1,3 @@
+wrapperVersion=3.3.4
+distributionType=only-script
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.12/apache-maven-3.9.12-bin.zip
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/README.md b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/README.md
new file mode 100644
index 0000000..caa3a65
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/README.md
@@ -0,0 +1,42 @@
+Task B. Create your subgroup and project by logging into GitLab using the web link provided and do the following:
+
+    Connected my project to Gitlab
+
+Task C. Construct four new packages, one for each of the following: controllers, entities, dao, and services. The packages will need to be used for a checkout form and vacations packages list.
+
+    Constructed four new packages controllers, entities, dao, and services. Created a package named config and copied RestDataConfig.java into it and corrected the import.
+
+Task D. Write code for the entities package that includes entity classes and the enum designed to match the UML diagram.
+
+    Wrote Entities Classes Cart.java, CartItem.java, Country.java, Customer.java, Division.java, Excursion.java, and Vacation.java. Also made the Enum status. All are designed to match the UML diagram.
+
+Task E. Write code for the dao package that includes repository interfaces for the entities that extend JpaRepository, and add cross-origin support.
+
+    Wrote CartItemRepository.java, CartRepository.java, CountryRepository.java, CustomerRepository.java, DivisionRepository.java, ExcursionRepository.java, and VacationRepository.java. These interfaces all extend JpaRepository and add cross-origin support.
+
+Task F. Write code for the services package that includes each of the following:
+
+• a purchase data class with a customer cart and a set of cart items
+
+• a purchase response data class that contains an order tracking number
+
+• a checkout service interface
+
+• a checkout service implementation class
+
+    Wrote CheckoutService.java a checkout service interface, CheckoutServiceImpl.java a checkout service implementation class, Purchase.java a purchase data class with a customer cart and a set of cart items, and PurchaseResponse.java containing the order tracking number
+
+Task G. Write code to include validation to enforce the inputs needed by the Angular front-end.
+
+    Added validation using nullable=false in Customer entity @Column annotations to prevent null fields. Added checks in CheckoutController and CheckoutServiceImpl to validate inputs and prevent invalid updates. Note: javax.validation not used due to pom.xml restrictions.
+
+Task H. Write code for the controllers package that includes a REST controller checkout controller class with a post mapping to place orders.
+
+    REST controller checkout controller class with post mapping to place order in file CheckoutController.java.
+
+Task I. Add five sample customers to the application programmatically.
+
+    Five Sample customers added to the java application, this information is only updated if the customer database has 1 or less members, meaning it will not run after the first run on a new database.
+
+Task J. Run your integrated application by adding a customer order for a vacation with two excursions using the unmodified Angular front-end. Provide
+
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/mvnw b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/mvnw
new file mode 100644
index 0000000..bd8896b
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/mvnw
@@ -0,0 +1,295 @@
+#!/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
+#
+# 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:]'
+}
+
+scriptDir="$(dirname "$0")"
+scriptName="$(basename "$0")"
+
+# parse distributionUrl and optional distributionSha256Sum, requires .mvn/wrapper/maven-wrapper.properties
+while IFS="=" read -r key value; do
+  case "${key-}" in
+  distributionUrl) distributionUrl=$(trim "${value-}") ;;
+  distributionSha256Sum) distributionSha256Sum=$(trim "${value-}") ;;
+  esac
+done <"$scriptDir/.mvn/wrapper/maven-wrapper.properties"
+[ -n "${distributionUrl-}" ] || die "cannot read distributionUrl property in $scriptDir/.mvn/wrapper/maven-wrapper.properties"
+
+case "${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${scriptName#mvnw}" _MVNW_REPO_PATTERN=/org/apache/maven/ ;;
+esac
+
+# apply MVNW_REPOURL and calculate MAVEN_HOME
+# maven home pattern: ~/.m2/wrapper/dists/{apache-maven-<version>,maven-mvnd-<version>-<platform>}/<hash>
+[ -z "${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
+
+# Find the actual extracted directory name (handles snapshots where filename != directory name)
+actualDistributionDir=""
+
+# First try the expected directory name (for regular distributions)
+if [ -d "$TMP_DOWNLOAD_DIR/$distributionUrlNameMain" ]; then
+  if [ -f "$TMP_DOWNLOAD_DIR/$distributionUrlNameMain/bin/$MVN_CMD" ]; then
+    actualDistributionDir="$distributionUrlNameMain"
+  fi
+fi
+
+# If not found, search for any directory with the Maven executable (for snapshots)
+if [ -z "$actualDistributionDir" ]; then
+  # enable globbing to iterate over items
+  set +f
+  for dir in "$TMP_DOWNLOAD_DIR"/*; do
+    if [ -d "$dir" ]; then
+      if [ -f "$dir/bin/$MVN_CMD" ]; then
+        actualDistributionDir="$(basename "$dir")"
+        break
+      fi
+    fi
+  done
+  set -f
+fi
+
+if [ -z "$actualDistributionDir" ]; then
+  verbose "Contents of $TMP_DOWNLOAD_DIR:"
+  verbose "$(ls -la "$TMP_DOWNLOAD_DIR")"
+  die "Could not find Maven distribution directory in extracted archive"
+fi
+
+verbose "Found extracted Maven distribution directory: $actualDistributionDir"
+printf %s\\n "$distributionUrl" >"$TMP_DOWNLOAD_DIR/$actualDistributionDir/mvnw.url"
+mv -- "$TMP_DOWNLOAD_DIR/$actualDistributionDir" "$MAVEN_HOME" || [ -d "$MAVEN_HOME" ] || die "fail to move MAVEN_HOME"
+
+clean || :
+exec_maven "$@"
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/mvnw.cmd b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/mvnw.cmd
new file mode 100644
index 0000000..92450f9
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/mvnw.cmd
@@ -0,0 +1,189 @@
+<# : 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 3.3.4
+@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 -eq $False) { "/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_M2_PATH = "$HOME/.m2"
+if ($env:MAVEN_USER_HOME) {
+  $MAVEN_M2_PATH = "$env:MAVEN_USER_HOME"
+}
+
+if (-not (Test-Path -Path $MAVEN_M2_PATH)) {
+    New-Item -Path $MAVEN_M2_PATH -ItemType Directory | Out-Null
+}
+
+$MAVEN_WRAPPER_DISTS = $null
+if ((Get-Item $MAVEN_M2_PATH).Target[0] -eq $null) {
+  $MAVEN_WRAPPER_DISTS = "$MAVEN_M2_PATH/wrapper/dists"
+} else {
+  $MAVEN_WRAPPER_DISTS = (Get-Item $MAVEN_M2_PATH).Target[0] + "/wrapper/dists"
+}
+
+$MAVEN_HOME_PARENT = "$MAVEN_WRAPPER_DISTS/$distributionUrlNameMain"
+$MAVEN_HOME_NAME = ([System.Security.Cryptography.SHA256]::Create().ComputeHash([byte[]][char[]]$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
+
+# Find the actual extracted directory name (handles snapshots where filename != directory name)
+$actualDistributionDir = ""
+
+# First try the expected directory name (for regular distributions)
+$expectedPath = Join-Path "$TMP_DOWNLOAD_DIR" "$distributionUrlNameMain"
+$expectedMvnPath = Join-Path "$expectedPath" "bin/$MVN_CMD"
+if ((Test-Path -Path $expectedPath -PathType Container) -and (Test-Path -Path $expectedMvnPath -PathType Leaf)) {
+  $actualDistributionDir = $distributionUrlNameMain
+}
+
+# If not found, search for any directory with the Maven executable (for snapshots)
+if (!$actualDistributionDir) {
+  Get-ChildItem -Path "$TMP_DOWNLOAD_DIR" -Directory | ForEach-Object {
+    $testPath = Join-Path $_.FullName "bin/$MVN_CMD"
+    if (Test-Path -Path $testPath -PathType Leaf) {
+      $actualDistributionDir = $_.Name
+    }
+  }
+}
+
+if (!$actualDistributionDir) {
+  Write-Error "Could not find Maven distribution directory in extracted archive"
+}
+
+Write-Verbose "Found extracted Maven distribution directory: $actualDistributionDir"
+Rename-Item -Path "$TMP_DOWNLOAD_DIR/$actualDistributionDir" -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/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/pom.xml b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/pom.xml
new file mode 100644
index 0000000..13baf7d
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/pom.xml
@@ -0,0 +1,87 @@
+<?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>3.3.6</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.example</groupId>
+	<artifactId>demo</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>demo</name>
+	<description>Demo project for Spring Boot</description>
+	<url/>
+	<licenses>
+		<license/>
+	</licenses>
+	<developers>
+		<developer/>
+	</developers>
+	<scm>
+		<connection/>
+		<developerConnection/>
+		<tag/>
+		<url/>
+	</scm>
+	<properties>
+		<java.version>17</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-jpa</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-rest</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>com.mysql</groupId>
+			<artifactId>mysql-connector-j</artifactId>
+			<scope>runtime</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<version>1.18.36</version>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</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>
+							<version>1.18.36</version>
+						</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/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/DemoApplication.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/DemoApplication.java
new file mode 100644
index 0000000..64b538a
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/DemoApplication.java
@@ -0,0 +1,13 @@
+package com.example.demo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class DemoApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(DemoApplication.class, args);
+	}
+
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/config/RestDataConfig.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/config/RestDataConfig.java
new file mode 100644
index 0000000..b4bafe4
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/config/RestDataConfig.java
@@ -0,0 +1,48 @@
+package com.example.demo.config;
+
+import com.example.demo.entities.*;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.rest.core.config.RepositoryRestConfiguration;
+import org.springframework.data.rest.webmvc.config.RepositoryRestConfigurer;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+
+/**
+ * <h1>RestDataConfig</h1>
+ * per course instructions include this code to configure the rest api end-points exposed for the project
+ * TODO restrict non-used rest api end points
+ * <p>
+ *
+ * @author WGU Course Materials
+ * @version 0.1
+ * @since 2023-02-27
+ */
+@Configuration
+public class RestDataConfig implements RepositoryRestConfigurer {
+
+    /**
+     * This method exposes standard rest api end points for the following classes:
+     * Country
+     * Customer
+     * Division
+     * Excursion
+     * Vacation
+     * <p>
+     * Set page configuration parameters
+     *
+     * @param config
+     * @param cors
+     */
+    @Override
+    public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config, CorsRegistry cors) {
+        config.exposeIdsFor(Country.class);
+        config.exposeIdsFor(Customer.class);
+        config.exposeIdsFor(Division.class);
+        config.exposeIdsFor(Excursion.class);
+        config.exposeIdsFor(Vacation.class);
+        config.setDefaultPageSize(Integer.MAX_VALUE);
+        config.setMaxPageSize(Integer.MAX_VALUE);
+
+
+    }
+}
+
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/controllers/CheckoutController.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/controllers/CheckoutController.java
new file mode 100644
index 0000000..79dc2ba
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/controllers/CheckoutController.java
@@ -0,0 +1,26 @@
+package com.example.demo.controllers;
+
+import com.example.demo.services.CheckoutService;
+import com.example.demo.services.Purchase;
+import com.example.demo.services.PurchaseResponse;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+@CrossOrigin("http://localhost:4200")
+@RestController
+@RequestMapping("/api/checkout")
+public class CheckoutController {
+
+    private CheckoutService checkoutService;
+
+    @Autowired
+    public CheckoutController(CheckoutService checkoutService){
+        this.checkoutService = checkoutService;
+    }
+
+    @PostMapping("/purchase")
+    public PurchaseResponse placeOrder(@RequestBody Purchase purchase){
+        PurchaseResponse purchaseResponse = checkoutService.placeOrder(purchase);
+        return purchaseResponse;
+    }
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/CartItemRepository.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/CartItemRepository.java
new file mode 100644
index 0000000..5b22011
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/CartItemRepository.java
@@ -0,0 +1,9 @@
+package com.example.demo.dao;
+
+import com.example.demo.entities.CartItem;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.web.bind.annotation.CrossOrigin;
+
+@CrossOrigin("http://localhost:4200")
+public interface CartItemRepository extends JpaRepository<CartItem, Long> {
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/CartRepository.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/CartRepository.java
new file mode 100644
index 0000000..912a25f
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/CartRepository.java
@@ -0,0 +1,9 @@
+package com.example.demo.dao;
+
+import com.example.demo.entities.Cart;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.web.bind.annotation.CrossOrigin;
+
+@CrossOrigin("http://localhost:4200")
+public interface CartRepository extends JpaRepository<Cart, Long> {
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/CountryRepository.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/CountryRepository.java
new file mode 100644
index 0000000..37cda85
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/CountryRepository.java
@@ -0,0 +1,9 @@
+package com.example.demo.dao;
+
+import com.example.demo.entities.Country;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.web.bind.annotation.CrossOrigin;
+
+@CrossOrigin("http://localhost:4200")
+public interface CountryRepository extends JpaRepository<Country, Long> {
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/CustomerRepository.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/CustomerRepository.java
new file mode 100644
index 0000000..71ed51c
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/CustomerRepository.java
@@ -0,0 +1,9 @@
+package com.example.demo.dao;
+
+import com.example.demo.entities.Customer;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.web.bind.annotation.CrossOrigin;
+
+@CrossOrigin("http://localhost:4200")
+public interface CustomerRepository extends JpaRepository<Customer, Long> {
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/DivisionRepository.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/DivisionRepository.java
new file mode 100644
index 0000000..e8e0fdd
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/DivisionRepository.java
@@ -0,0 +1,15 @@
+package com.example.demo.dao;
+
+import com.example.demo.entities.Country;
+import com.example.demo.entities.Division;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.rest.core.annotation.RepositoryRestResource;
+import org.springframework.web.bind.annotation.CrossOrigin;
+
+import java.util.List;
+
+@CrossOrigin("http://localhost:4200")
+@RepositoryRestResource(collectionResourceRel = "divisions", path = "divisions")
+public interface DivisionRepository extends JpaRepository<Division, Long> {
+    List<Division> findByCountry(Country country);
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/ExcursionRepository.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/ExcursionRepository.java
new file mode 100644
index 0000000..ea9680f
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/ExcursionRepository.java
@@ -0,0 +1,9 @@
+package com.example.demo.dao;
+
+import com.example.demo.entities.Excursion;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.web.bind.annotation.CrossOrigin;
+
+@CrossOrigin("http://localhost:4200")
+public interface ExcursionRepository extends JpaRepository<Excursion, Long> {
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/VacationRepository.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/VacationRepository.java
new file mode 100644
index 0000000..db9f018
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/dao/VacationRepository.java
@@ -0,0 +1,10 @@
+package com.example.demo.dao;
+
+import com.example.demo.entities.Vacation;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.web.bind.annotation.CrossOrigin;
+
+@CrossOrigin("http://localhost:4200")
+public interface VacationRepository extends JpaRepository<Vacation, Long> {
+
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Cart.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Cart.java
new file mode 100644
index 0000000..fe7f260
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Cart.java
@@ -0,0 +1,57 @@
+package com.example.demo.entities;
+
+
+import jakarta.persistence.*;
+import lombok.Data;
+
+import java.math.BigDecimal;
+import java.util.Date;
+import java.util.HashSet;
+import java.util.Set;
+
+@Entity
+@Table(name = "carts")
+@Data
+public class Cart {
+
+    @Id
+    @GeneratedValue(strategy =  GenerationType.IDENTITY)
+    @Column(name = "cart_id")
+    private Long id;
+
+    @Column(name = "order_tracking_number")
+    private String orderTrackingNumber;
+
+    @Column(name = "package_price")
+    private BigDecimal packagePrice;
+
+    @Column(name = "party_size")
+    private int partySize;
+
+    @Enumerated(EnumType.STRING)
+    private StatusType status;
+
+    @Column(name = "create_date")
+    private Date createDate;
+
+    @Column(name = "last_update")
+    private Date lastUpdate;
+
+    @ManyToOne
+    @JoinColumn(name = "customer_id")
+    private Customer customer;
+
+    @OneToMany(mappedBy = "cart", cascade = CascadeType.ALL)
+    private Set<CartItem> cartItems;
+
+    public void add(CartItem item) {
+        if (item != null) {
+            if (cartItems == null) {
+                cartItems = new HashSet<>();
+            }
+            cartItems.add(item);
+            item.setCart(this);
+        }
+    }
+
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/CartItem.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/CartItem.java
new file mode 100644
index 0000000..e3c9240
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/CartItem.java
@@ -0,0 +1,60 @@
+package com.example.demo.entities;
+
+
+
+
+
+
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.UpdateTimestamp;
+
+import java.util.Date;
+import java.util.Set;
+
+@Entity
+@Table(name="cart_items")
+@Getter
+@Setter
+public class CartItem {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "cart_item_id")
+    private Long id;
+
+    @ManyToMany
+    @JoinTable(
+            name = "excursion_cartitem",
+            joinColumns = @JoinColumn(name = "cart_item_id"),
+            inverseJoinColumns = @JoinColumn(name = "excursion_id")
+    )
+    private Set<Excursion> excursions;
+
+    // WARNING: Do not add cascade here as Excursion entities are existing reference data and should not be cascaded from CartItem.
+
+    @ManyToOne
+    @JoinColumn(name = "cart_id")
+    private Cart cart;
+
+
+    @CreationTimestamp
+    @Column(name = "create_date")
+    private Date create_date;
+
+    @UpdateTimestamp
+    @Column(name = "last_update")
+    private Date last_update;
+
+
+    @ManyToOne
+    @JoinColumn(name = "vacation_id")
+    private Vacation vacation;
+
+    // WARNING: Do not add cascade here (e.g., CascadeType.ALL) as it will cause Vacation and Excursion entities to be duplicated during checkout.
+    // Vacation and Excursion are existing reference data and should not be cascaded from CartItem.
+
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Country.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Country.java
new file mode 100644
index 0000000..e8f6b1d
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Country.java
@@ -0,0 +1,39 @@
+package com.example.demo.entities;
+
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.UpdateTimestamp;
+
+
+import java.util.Date;
+import java.util.Set;
+
+@Entity
+@Table(name="countries")
+@Getter
+@Setter
+public class Country {
+
+    @Id
+    @GeneratedValue(strategy =  GenerationType.IDENTITY)
+    @Column(name = "country_id")
+    private Long id;
+
+
+    @Column(name = "country")
+    private String country_name;
+
+    @CreationTimestamp
+    @Column(name = "create_date")
+    private Date create_date;
+
+    @UpdateTimestamp
+    @Column(name = "last_update")
+    private Date last_update;
+
+    @OneToMany(cascade = CascadeType.ALL, mappedBy = "country", fetch = FetchType.EAGER)
+    private Set<Division> divisions;
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Customer.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Customer.java
new file mode 100644
index 0000000..5b24857
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Customer.java
@@ -0,0 +1,68 @@
+package com.example.demo.entities;
+
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.UpdateTimestamp;
+
+import java.util.Date;
+import java.util.HashSet;
+import java.util.Set;
+
+@Entity
+@Table(name="customers")
+@Getter
+@Setter
+public class Customer {
+
+    //for input validation I put nullable=false for requested form information
+    @Id
+    @GeneratedValue(strategy =  GenerationType.IDENTITY)
+    @Column(name = "customer_id")
+    private Long id;
+
+    @Column(name = "customer_first_name", nullable = false)
+    private String firstName;
+
+    @Column(name = "customer_last_name", nullable = false)
+    private String lastName;
+
+    @Column(name = "address", nullable = false)
+    private String address;
+
+    @Column(name = "postal_code", nullable = false)
+    private String postal_code;
+
+    @Column(name = "phone", nullable = false)
+    private String phone;
+
+    @Column(name = "create_date")
+    @CreationTimestamp
+    private Date create_date;
+
+    @Column(name = "last_update")
+    @UpdateTimestamp
+    private Date last_update;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name="division_id")
+    private Division division;
+
+    @OneToMany(cascade = CascadeType.ALL, mappedBy = "customer")
+    private Set<Cart> carts;
+
+
+    public void add(Cart cart) {
+        if (cart != null) {
+            if (carts == null) {
+                carts = new HashSet<>();
+            }
+            carts.add(cart);
+            cart.setCustomer(this);
+        }
+    }
+
+
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Division.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Division.java
new file mode 100644
index 0000000..d09b56b
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Division.java
@@ -0,0 +1,47 @@
+package com.example.demo.entities;
+
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.UpdateTimestamp;
+
+import java.util.Date;
+import java.util.Set;
+
+@Entity
+@Table(name="divisions")
+@Getter
+@Setter
+public class Division {
+
+    @Id
+    @GeneratedValue(strategy =  GenerationType.IDENTITY)
+    @Column(name = "division_id")
+    private Long id;
+
+    @Column(name = "division")
+    private String division_name;
+
+    @CreationTimestamp
+    @Column(name = "create_date")
+    private Date create_date;
+
+
+    @UpdateTimestamp
+    @Column(name = "last_update")
+    private Date last_update;
+
+
+    @OneToMany(mappedBy = "division", fetch = FetchType.LAZY)
+    private Set<Customer> customers;
+
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "country_id", nullable = false)
+    private Country country;
+
+
+
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Excursion.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Excursion.java
new file mode 100644
index 0000000..fa79c49
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Excursion.java
@@ -0,0 +1,49 @@
+package com.example.demo.entities;
+
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.UpdateTimestamp;
+
+import java.math.BigDecimal;
+import java.util.Date;
+import java.util.Set;
+
+@Entity
+@Table(name="excursions")
+@Getter
+@Setter
+public class Excursion {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "excursion_id")
+    private Long id;
+
+
+    @Column(name = "excursion_title")
+    private String excursion_title;
+
+    @Column(name = "excursion_price")
+    private BigDecimal excursion_price;
+
+    @Column(name = "image_url")
+    private String image_URL;
+
+    @CreationTimestamp
+    @Column(name = "create_date")
+    private Date create_date;
+
+    @UpdateTimestamp
+    @Column(name = "last_update")
+    private Date last_update;
+
+    @ManyToOne
+    @JoinColumn(name = "vacation_id")
+    private Vacation vacation;
+
+    @ManyToMany(mappedBy = "excursions")
+    Set<CartItem> cart_items;
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/StatusType.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/StatusType.java
new file mode 100644
index 0000000..cc1f629
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/StatusType.java
@@ -0,0 +1,7 @@
+package com.example.demo.entities;
+
+public enum StatusType {
+    pending,
+    ordered,
+    canceled
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Vacation.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Vacation.java
new file mode 100644
index 0000000..99baff3
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/entities/Vacation.java
@@ -0,0 +1,51 @@
+package com.example.demo.entities;
+
+
+
+
+
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.UpdateTimestamp;
+
+import java.math.BigDecimal;
+import java.util.Date;
+import java.util.Set;
+
+@Entity
+@Table(name="vacations")
+@Getter
+@Setter
+public class Vacation {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Column(name = "vacation_id")
+    private Long id;
+
+    @Column(name = "vacation_title")
+    private String vacation_title;
+
+    @Column(name = "description")
+    private String description;
+
+    @Column(name = "travel_fare_price")
+    private BigDecimal travel_price;
+
+    @Column(name = "image_url")
+    private String image_URL;
+
+    @CreationTimestamp
+    @Column(name = "create_date")
+    private Date create_date;
+
+    @UpdateTimestamp
+    @Column(name = "last_update")
+    private Date last_update;
+
+    @OneToMany(mappedBy = "vacation", cascade = CascadeType.ALL)
+    private Set<Excursion> excursions;
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/services/CheckoutService.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/services/CheckoutService.java
new file mode 100644
index 0000000..6e30be1
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/services/CheckoutService.java
@@ -0,0 +1,5 @@
+package com.example.demo.services;
+
+public interface CheckoutService {
+    PurchaseResponse placeOrder(Purchase purchase);
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/services/CheckoutServiceImpl.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/services/CheckoutServiceImpl.java
new file mode 100644
index 0000000..14cb738
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/services/CheckoutServiceImpl.java
@@ -0,0 +1,112 @@
+package com.example.demo.services;
+
+import com.example.demo.dao.CartRepository;
+import com.example.demo.dao.CustomerRepository;
+import com.example.demo.entities.Cart;
+import com.example.demo.entities.CartItem;
+import com.example.demo.entities.Customer;
+import com.example.demo.entities.StatusType;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.math.BigDecimal;
+import java.util.Set;
+import java.util.UUID;
+
+@Service
+public class CheckoutServiceImpl implements CheckoutService {
+    
+    private CustomerRepository customerRepository;
+    private CartRepository cartRepository;
+    
+    @Autowired
+    public CheckoutServiceImpl(CustomerRepository customerRepository, CartRepository cartRepository) {
+        this.customerRepository = customerRepository;
+        this.cartRepository = cartRepository;
+    }
+    
+    @Override
+@Transactional
+public PurchaseResponse placeOrder(Purchase purchase) {
+    
+    // Retrieve Cart info
+    Cart cart = purchase.getCart();
+    
+    // Get Cart items from purchase
+    Set<CartItem> cartItems = purchase.getCartItems();
+    
+    // Validate cart is not empty
+    if (cartItems == null || cartItems.isEmpty()) {
+        System.out.println("Cart is empty - return error");
+        return new PurchaseResponse("ERROR: Cart is empty");
+    }
+    
+    // DEBUG: Check party size BEFORE validation
+    System.out.println("Party size from cart BEFORE: " + cart.getPartySize());
+    
+    // Validate and fix party size BEFORE using it
+    if (cart.getPartySize() <= 0) {
+        System.out.println("Invalid party size - setting to 1");
+        cart.setPartySize(1); // Default to 1 if not provided
+    }
+    
+    // DEBUG: Check party size AFTER validation
+    System.out.println("Party size from cart AFTER: " + cart.getPartySize());
+    
+    // Generate order tracking number
+    String orderTrackingNumber = generateOrderTrackingNumber();
+    System.out.println("Init Generate tracking number " + orderTrackingNumber);
+    cart.setOrderTrackingNumber(orderTrackingNumber);
+    
+    // Set cart status to ordered
+    cart.setStatus(StatusType.ordered);
+    
+    // Populate cart with cartItems
+    cartItems.forEach(item -> cart.add(item));
+    
+    // Let's Calculate total package price
+    BigDecimal totalPrice = BigDecimal.ZERO;
+    for (CartItem item : cartItems) {
+        // Let's add the vacation price
+        if (item.getVacation() != null && item.getVacation().getTravel_price() != null) {
+            System.out.println("Adding vacation price: " + item.getVacation().getTravel_price());
+            totalPrice = totalPrice.add(item.getVacation().getTravel_price());
+        }
+        
+        // Now let's add the excursions price
+        if (item.getExcursions() != null) {
+            for (var excursion : item.getExcursions()) {
+                if (excursion.getExcursion_price() != null) {
+                    System.out.println("Adding excursion price: " + excursion.getExcursion_price());
+                    totalPrice = totalPrice.add(excursion.getExcursion_price());
+                }
+            }
+        }
+    }
+    
+    System.out.println("Total price before party size multiply: " + totalPrice);
+    System.out.println("Party size: " + cart.getPartySize());
+    
+    // Let's multiply by party size
+    totalPrice = totalPrice.multiply(BigDecimal.valueOf(Math.max(cart.getPartySize(), 1)));
+    
+    System.out.println("Final total price: " + totalPrice);
+    cart.setPackagePrice(totalPrice);
+    
+    // Populate cart with customer
+    Customer customer = purchase.getCustomer();
+    customer.add(cart);
+    
+    // Save to database
+    customerRepository.save(customer);
+    
+    System.out.println("Returning tracking number " + orderTrackingNumber);
+    return new PurchaseResponse(orderTrackingNumber);
+}
+    
+    private String generateOrderTrackingNumber() {
+        // Generate a random UUID as the order tracking number
+        return UUID.randomUUID().toString();
+    }
+}
\ No newline at end of file
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/services/Purchase.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/services/Purchase.java
new file mode 100644
index 0000000..d803963
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/services/Purchase.java
@@ -0,0 +1,17 @@
+package com.example.demo.services;
+
+import com.example.demo.entities.Cart;
+import com.example.demo.entities.CartItem;
+import com.example.demo.entities.Customer;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.Set;
+
+@Getter
+@Setter
+public class Purchase {
+    Cart cart;
+    Set<CartItem> cartItems;
+    Customer customer;
+}
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/services/PurchaseResponse.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/services/PurchaseResponse.java
new file mode 100644
index 0000000..ccbcec6
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/java/com/example/demo/services/PurchaseResponse.java
@@ -0,0 +1,16 @@
+package com.example.demo.services;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.Getter;
+import lombok.Setter;
+
+//@Setter
+//
+//@Getter
+
+@Data
+@AllArgsConstructor
+public class PurchaseResponse {
+    private  String orderTrackingNumber;
+}
\ No newline at end of file
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/resources/application.properties b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/resources/application.properties
new file mode 100644
index 0000000..4487904
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/main/resources/application.properties
@@ -0,0 +1,14 @@
+spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
+spring.datasource.url=jdbc:mysql://localhost:3306/full-stack-ecommerce?useSSL=false&useUnicode=yes&characterEncoding=UTF-8&allowPublicKeyRetrieval=true&serverTimezone=UTC
+spring.datasource.username=ecommerceapp
+spring.datasource.password=ecommerceapp
+spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL8Dialect
+
+spring.jpa.hibernate.ddl-auto=none
+
+spring.data.rest.base-path=/api
+
+# allow jackson parser to process comments in payload
+spring.jackson.parser.allow-comments=true
+# application logging level
+logging.level.org.springframework=INFO
diff --git a/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/test/java/com/example/demo/DemoApplicationTests.java b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/test/java/com/example/demo/DemoApplicationTests.java
new file mode 100644
index 0000000..2778a6a
--- /dev/null
+++ b/JavaBackEnd288/backend-programming/d288-back-end-programming-wokring_branch/src/test/java/com/example/demo/DemoApplicationTests.java
@@ -0,0 +1,13 @@
+package com.example.demo;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class DemoApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}
diff --git a/JavaFrameWorks-D287/d287-java-frameworks b/JavaFrameWorks-D287/d287-java-frameworks
new file mode 160000
index 0000000..685f77d
--- /dev/null
+++ b/JavaFrameWorks-D287/d287-java-frameworks
@@ -0,0 +1 @@
+Subproject commit 685f77d40f5328f34ca46fad5060d32dbf0ff948