diff --git a/integration/spring_jpa/.gitignore b/integration/spring_jpa/.gitignore
new file mode 100644
index 0000000..549e00a
--- /dev/null
+++ b/integration/spring_jpa/.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/integration/spring_jpa/.mvn/wrapper/maven-wrapper.jar b/integration/spring_jpa/.mvn/wrapper/maven-wrapper.jar
new file mode 100644
index 0000000..c1dd12f
Binary files /dev/null and b/integration/spring_jpa/.mvn/wrapper/maven-wrapper.jar differ
diff --git a/integration/spring_jpa/.mvn/wrapper/maven-wrapper.properties b/integration/spring_jpa/.mvn/wrapper/maven-wrapper.properties
new file mode 100644
index 0000000..b74bf7f
--- /dev/null
+++ b/integration/spring_jpa/.mvn/wrapper/maven-wrapper.properties
@@ -0,0 +1,2 @@
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.6/apache-maven-3.8.6-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar
diff --git a/integration/spring_jpa/README.adoc b/integration/spring_jpa/README.adoc
new file mode 100644
index 0000000..1e1aa00
--- /dev/null
+++ b/integration/spring_jpa/README.adoc
@@ -0,0 +1,31 @@
+= JPA Example
+
+Examples prepared to explain the below concepts.
+
+1. Use Lazy loading
+2. Usage of java.time.localdate.
+3. Enum usage with converter
+
+
+=== Lazy loading
+
+Always advised to use lazy loading. Lazy loading fetches data only when it is really required. This example uses FetchType Lazy, the invited guests will be loaded only on demand.
+
+A `SELECT` query applied for fetching booking or bookings will not fetch any invited guests. The below statement fetches all guests for a particular booking. It executes a `SELECT` query with booking id as arguement.
+ `BookingEntity.getInvitedGuests()`
+
+
+=== Enum
+
+Using Converter annotation convert an entity attribute to a database value and vice versa. In this example, enum defined as BOOKED("B"), and NOTBOOKED("N") and CANCELED ("C"). This helps to make sure the code is not broken by refactorings.
+
+The other two ways to deal with enums are by their `Ordinal` or by `name`. `Ordinal` may not be a good choice, if someone changes the places of the items in enum, wrong integer value may be stored.
+
+=== LocalDateTime
+
+java.time.LocalDateTime used instead of java.util.date, major benefits are:
+
+* LocalDateTime API has its own format/parse methods.
+* Addition/subtraction operation are easier (minusMinutes,plusDays etc.)
+
+
diff --git a/integration/spring_jpa/mvnw b/integration/spring_jpa/mvnw
new file mode 100644
index 0000000..8a8fb22
--- /dev/null
+++ b/integration/spring_jpa/mvnw
@@ -0,0 +1,316 @@
+#!/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
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Maven Start Up Batch script
+#
+# Required ENV vars:
+# ------------------
+# JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+# M2_HOME - location of maven2's installed home dir
+# MAVEN_OPTS - parameters passed to the Java VM when running Maven
+# e.g. to debug Maven itself, use
+# set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+# MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+ if [ -f /usr/local/etc/mavenrc ] ; then
+ . /usr/local/etc/mavenrc
+ fi
+
+ if [ -f /etc/mavenrc ] ; then
+ . /etc/mavenrc
+ fi
+
+ if [ -f "$HOME/.mavenrc" ] ; then
+ . "$HOME/.mavenrc"
+ fi
+
+fi
+
+# OS specific support. $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+ CYGWIN*) cygwin=true ;;
+ MINGW*) mingw=true;;
+ Darwin*) darwin=true
+ # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+ # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+ if [ -z "$JAVA_HOME" ]; then
+ if [ -x "/usr/libexec/java_home" ]; then
+ export JAVA_HOME="`/usr/libexec/java_home`"
+ else
+ export JAVA_HOME="/Library/Java/Home"
+ fi
+ fi
+ ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+ if [ -r /etc/gentoo-release ] ; then
+ JAVA_HOME=`java-config --jre-home`
+ fi
+fi
+
+if [ -z "$M2_HOME" ] ; then
+ ## resolve links - $0 may be a link to maven's home
+ PRG="$0"
+
+ # need this for relative symlinks
+ while [ -h "$PRG" ] ; do
+ ls=`ls -ld "$PRG"`
+ link=`expr "$ls" : '.*-> \(.*\)$'`
+ if expr "$link" : '/.*' > /dev/null; then
+ PRG="$link"
+ else
+ PRG="`dirname "$PRG"`/$link"
+ fi
+ done
+
+ saveddir=`pwd`
+
+ M2_HOME=`dirname "$PRG"`/..
+
+ # make it fully qualified
+ M2_HOME=`cd "$M2_HOME" && pwd`
+
+ cd "$saveddir"
+ # echo Using m2 at $M2_HOME
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+ [ -n "$M2_HOME" ] &&
+ M2_HOME=`cygpath --unix "$M2_HOME"`
+ [ -n "$JAVA_HOME" ] &&
+ JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+ [ -n "$CLASSPATH" ] &&
+ CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+ [ -n "$M2_HOME" ] &&
+ M2_HOME="`(cd "$M2_HOME"; pwd)`"
+ [ -n "$JAVA_HOME" ] &&
+ JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+ javaExecutable="`which javac`"
+ if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+ # readlink(1) is not available as standard on Solaris 10.
+ readLink=`which readlink`
+ if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+ if $darwin ; then
+ javaHome="`dirname \"$javaExecutable\"`"
+ javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+ else
+ javaExecutable="`readlink -f \"$javaExecutable\"`"
+ fi
+ javaHome="`dirname \"$javaExecutable\"`"
+ javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+ JAVA_HOME="$javaHome"
+ export JAVA_HOME
+ fi
+ fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+ if [ -n "$JAVA_HOME" ] ; then
+ if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+ # IBM's JDK on AIX uses strange locations for the executables
+ JAVACMD="$JAVA_HOME/jre/sh/java"
+ else
+ JAVACMD="$JAVA_HOME/bin/java"
+ fi
+ else
+ JAVACMD="`\\unset -f command; \\command -v java`"
+ fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+ echo "Error: JAVA_HOME is not defined correctly." >&2
+ echo " We cannot execute $JAVACMD" >&2
+ exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+ echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+
+ if [ -z "$1" ]
+ then
+ echo "Path not specified to find_maven_basedir"
+ return 1
+ fi
+
+ basedir="$1"
+ wdir="$1"
+ while [ "$wdir" != '/' ] ; do
+ if [ -d "$wdir"/.mvn ] ; then
+ basedir=$wdir
+ break
+ fi
+ # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+ if [ -d "${wdir}" ]; then
+ wdir=`cd "$wdir/.."; pwd`
+ fi
+ # end of workaround
+ done
+ echo "${basedir}"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+ if [ -f "$1" ]; then
+ echo "$(tr -s '\n' ' ' < "$1")"
+ fi
+}
+
+BASE_DIR=`find_maven_basedir "$(pwd)"`
+if [ -z "$BASE_DIR" ]; then
+ exit 1;
+fi
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in binary data.
+##########################################################################################
+if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo "Found .mvn/wrapper/maven-wrapper.jar"
+ fi
+else
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..."
+ fi
+ if [ -n "$MVNW_REPOURL" ]; then
+ jarUrl="$MVNW_REPOURL/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+ else
+ jarUrl="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+ fi
+ while IFS="=" read key value; do
+ case "$key" in (wrapperUrl) jarUrl="$value"; break ;;
+ esac
+ done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties"
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo "Downloading from: $jarUrl"
+ fi
+ wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar"
+ if $cygwin; then
+ wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"`
+ fi
+
+ if command -v wget > /dev/null; then
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo "Found wget ... using wget"
+ fi
+ if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+ wget "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+ else
+ wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath" || rm -f "$wrapperJarPath"
+ fi
+ elif command -v curl > /dev/null; then
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo "Found curl ... using curl"
+ fi
+ if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+ curl -o "$wrapperJarPath" "$jarUrl" -f
+ else
+ curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f
+ fi
+
+ else
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo "Falling back to using Java to download"
+ fi
+ javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java"
+ # For Cygwin, switch paths to Windows format before running javac
+ if $cygwin; then
+ javaClass=`cygpath --path --windows "$javaClass"`
+ fi
+ if [ -e "$javaClass" ]; then
+ if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo " - Compiling MavenWrapperDownloader.java ..."
+ fi
+ # Compiling the Java class
+ ("$JAVA_HOME/bin/javac" "$javaClass")
+ fi
+ if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+ # Running the downloader
+ if [ "$MVNW_VERBOSE" = true ]; then
+ echo " - Running MavenWrapperDownloader.java ..."
+ fi
+ ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR")
+ fi
+ fi
+ fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
+if [ "$MVNW_VERBOSE" = true ]; then
+ echo $MAVEN_PROJECTBASEDIR
+fi
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+ [ -n "$M2_HOME" ] &&
+ M2_HOME=`cygpath --path --windows "$M2_HOME"`
+ [ -n "$JAVA_HOME" ] &&
+ JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+ [ -n "$CLASSPATH" ] &&
+ CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+ [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+ MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+exec "$JAVACMD" \
+ $MAVEN_OPTS \
+ $MAVEN_DEBUG_OPTS \
+ -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+ "-Dmaven.home=${M2_HOME}" \
+ "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+ ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"
diff --git a/integration/spring_jpa/mvnw.cmd b/integration/spring_jpa/mvnw.cmd
new file mode 100644
index 0000000..1d8ab01
--- /dev/null
+++ b/integration/spring_jpa/mvnw.cmd
@@ -0,0 +1,188 @@
+@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 https://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 Maven Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on" echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_pre.bat" call "%USERPROFILE%\mavenrc_pre.bat" %*
+if exist "%USERPROFILE%\mavenrc_pre.cmd" call "%USERPROFILE%\mavenrc_pre.cmd" %*
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+
+FOR /F "usebackq tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+ IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+ if "%MVNW_VERBOSE%" == "true" (
+ echo Found %WRAPPER_JAR%
+ )
+) else (
+ if not "%MVNW_REPOURL%" == "" (
+ SET DOWNLOAD_URL="%MVNW_REPOURL%/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar"
+ )
+ if "%MVNW_VERBOSE%" == "true" (
+ echo Couldn't find %WRAPPER_JAR%, downloading it ...
+ echo Downloading from: %DOWNLOAD_URL%
+ )
+
+ powershell -Command "&{"^
+ "$webclient = new-object System.Net.WebClient;"^
+ "if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+ "$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+ "}"^
+ "[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^
+ "}"
+ if "%MVNW_VERBOSE%" == "true" (
+ echo Finished downloading %WRAPPER_JAR%
+ )
+)
+@REM End of extension
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% ^
+ %JVM_CONFIG_MAVEN_PROPS% ^
+ %MAVEN_OPTS% ^
+ %MAVEN_DEBUG_OPTS% ^
+ -classpath %WRAPPER_JAR% ^
+ "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" ^
+ %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%"=="" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%USERPROFILE%\mavenrc_post.bat" call "%USERPROFILE%\mavenrc_post.bat"
+if exist "%USERPROFILE%\mavenrc_post.cmd" call "%USERPROFILE%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%"=="on" pause
+
+if "%MAVEN_TERMINATE_CMD%"=="on" exit %ERROR_CODE%
+
+cmd /C exit /B %ERROR_CODE%
diff --git a/integration/spring_jpa/pom.xml b/integration/spring_jpa/pom.xml
new file mode 100644
index 0000000..b62d5e0
--- /dev/null
+++ b/integration/spring_jpa/pom.xml
@@ -0,0 +1,80 @@
+
+
+ 4.0.0
+
+ org.springframework.boot
+ spring-boot-starter-parent
+ 2.7.3
+
+
+ com.devonfw.examples.dataaccess.springjpa
+ spring_jpa
+ 0.0.1-SNAPSHOT
+ spring_jpa
+ devonfw jpa example (lazy loading, timestamp, enums)
+
+ 11
+
+
+
+ org.springframework.boot
+ spring-boot-starter-web
+
+
+ org.springframework.boot
+ spring-boot-starter-data-jpa
+
+
+ javax.persistence
+ javax.persistence-api
+
+
+ org.springframework.data
+ spring-data-jpa
+
+
+
+
+ com.h2database
+ h2
+
+
+
+
+ org.flywaydb
+ flyway-core
+
+
+
+ org.projectlombok
+ lombok
+ true
+
+
+
+ org.springframework.boot
+ spring-boot-starter-test
+ test
+
+
+
+
+
+
+
+ org.springframework.boot
+ spring-boot-maven-plugin
+
+
+
+ org.projectlombok
+ lombok
+
+
+
+
+
+
+
+
diff --git a/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/SpringJpaApplication.java b/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/SpringJpaApplication.java
new file mode 100644
index 0000000..63ea02d
--- /dev/null
+++ b/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/SpringJpaApplication.java
@@ -0,0 +1,13 @@
+package com.devonfw.examples.dataaccess.springjpa;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringJpaApplication {
+
+ public static void main(String[] args) {
+ SpringApplication.run(SpringJpaApplication.class, args);
+ }
+
+}
diff --git a/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/model/BookingEntity.java b/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/model/BookingEntity.java
new file mode 100644
index 0000000..af2d139
--- /dev/null
+++ b/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/model/BookingEntity.java
@@ -0,0 +1,45 @@
+package com.devonfw.examples.dataaccess.springjpa.domain.model;
+
+import static javax.persistence.CascadeType.ALL;
+
+import java.time.LocalDateTime;
+import java.util.Set;
+
+import javax.persistence.Entity;
+import javax.persistence.FetchType;
+import javax.persistence.JoinColumn;
+import javax.persistence.OneToMany;
+import javax.persistence.Table;
+
+import org.hibernate.annotations.BatchSize;
+
+import com.devonfw.examples.dataaccess.springjpa.general.domain.model.ApplicationPersistenceEntity;
+
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+
+@Setter
+@Getter
+@ToString(callSuper = true, includeFieldNames = true)
+@Entity
+@Table (name="booking")
+public class BookingEntity extends ApplicationPersistenceEntity {
+
+ private String name;
+
+ private String bookingToken;
+
+ private String comment;
+
+ private LocalDateTime bookingDate;
+
+ private String email;
+
+ private BookingStatus bookingStatus;
+
+ @OneToMany(cascade = ALL, fetch = FetchType.LAZY, orphanRemoval = true)
+ @JoinColumn(name = "id_booking")
+ @BatchSize(size = 2)
+ private Set invitedGuests;
+}
diff --git a/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/model/BookingStatus.java b/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/model/BookingStatus.java
new file mode 100644
index 0000000..a5c5f57
--- /dev/null
+++ b/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/model/BookingStatus.java
@@ -0,0 +1,22 @@
+package com.devonfw.examples.dataaccess.springjpa.domain.model;
+
+/**
+ * BookingStatus enumerator helps to handle Status in a better way. Here the
+ * code associated with each enum is persisted to the database instead of the
+ * whole string, by the BookingStatusConverter.
+ */
+public enum BookingStatus {
+ BOOKED("B"), CANCELED("C"), NOTBOOKED("N");
+
+ private String code;
+
+ BookingStatus(String code) {
+
+ this.code = code;
+ }
+
+ public String getCode() {
+
+ return this.code;
+ }
+}
diff --git a/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/model/InvitedGuestEntity.java b/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/model/InvitedGuestEntity.java
new file mode 100644
index 0000000..31f90c9
--- /dev/null
+++ b/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/model/InvitedGuestEntity.java
@@ -0,0 +1,22 @@
+package com.devonfw.examples.dataaccess.springjpa.domain.model;
+
+import javax.persistence.Entity;
+import javax.persistence.Table;
+
+import com.devonfw.examples.dataaccess.springjpa.general.domain.model.ApplicationPersistenceEntity;
+
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+@Setter
+@Getter
+@ToString(callSuper = true, includeFieldNames = true)
+@Entity
+@Table (name="Invited_Guest")
+public class InvitedGuestEntity extends ApplicationPersistenceEntity {
+
+ private String guestToken;
+
+ private String email;
+
+}
diff --git a/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/model/converter/BookingStatusConverter.java b/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/model/converter/BookingStatusConverter.java
new file mode 100644
index 0000000..b3aeefe
--- /dev/null
+++ b/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/model/converter/BookingStatusConverter.java
@@ -0,0 +1,46 @@
+package com.devonfw.examples.dataaccess.springjpa.domain.model.converter;
+
+import java.util.stream.Stream;
+
+import javax.persistence.AttributeConverter;
+import javax.persistence.Converter;
+
+import com.devonfw.examples.dataaccess.springjpa.domain.model.BookingStatus;
+/**
+ * BookingStatusConverter defines a mapping between BookinStatus enum and the
+ * database column booking_status at booking table.
+ *
+ */
+@Converter(autoApply = true)
+public class BookingStatusConverter
+ implements
+ AttributeConverter {
+
+ /**
+ * Converts BookingStatus to string 'code', eg: `BOOKED` to 'B'.
+ */
+ @Override
+ public String convertToDatabaseColumn(BookingStatus status) {
+
+ if (status == null) {
+ return null;
+ }
+ return status.getCode();
+ }
+
+ /**
+ * Converts the string 'code' to BookingStatus eg: 'B' to `BOOKED`
+ */
+ @Override
+ public BookingStatus convertToEntityAttribute(final String code) {
+
+ if (code == null) {
+ return null;
+ }
+
+ return Stream.of(BookingStatus.values())
+ .filter(c -> c.getCode().equals(code)).findFirst()
+ .orElseThrow(IllegalArgumentException::new);
+ }
+
+}
diff --git a/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/repository/BookingRepository.java b/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/repository/BookingRepository.java
new file mode 100644
index 0000000..9af33ce
--- /dev/null
+++ b/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/domain/repository/BookingRepository.java
@@ -0,0 +1,11 @@
+package com.devonfw.examples.dataaccess.springjpa.domain.repository;
+
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.stereotype.Repository;
+
+import com.devonfw.examples.dataaccess.springjpa.domain.model.BookingEntity;
+
+@Repository
+public interface BookingRepository extends CrudRepository {
+
+}
diff --git a/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/general/domain/model/ApplicationPersistenceEntity.java b/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/general/domain/model/ApplicationPersistenceEntity.java
new file mode 100644
index 0000000..e4fa679
--- /dev/null
+++ b/integration/spring_jpa/src/main/java/com/devonfw/examples/dataaccess/springjpa/general/domain/model/ApplicationPersistenceEntity.java
@@ -0,0 +1,28 @@
+package com.devonfw.examples.dataaccess.springjpa.general.domain.model;
+
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.MappedSuperclass;
+import javax.persistence.Version;
+
+import lombok.Getter;
+import lombok.Setter;
+
+/**
+ * Abstract Entity for all Entities with an id and a version field.
+ *
+ */
+
+@Setter
+@Getter
+@MappedSuperclass
+public abstract class ApplicationPersistenceEntity {
+
+ @Id
+ @GeneratedValue(strategy = GenerationType.SEQUENCE)
+ private Long id;
+
+ @Version
+ private Integer modificationCounter;
+}
\ No newline at end of file
diff --git a/integration/spring_jpa/src/main/resources/application.properties b/integration/spring_jpa/src/main/resources/application.properties
new file mode 100644
index 0000000..8ae5125
--- /dev/null
+++ b/integration/spring_jpa/src/main/resources/application.properties
@@ -0,0 +1,11 @@
+logging.level.org.hibernate.SQL=DEBUG
+spring.jpa.show-sql=true
+spring.jpa.properties.hibernate.format_sql=true
+logging.level.org.hibernate.type=DEBUG
+
+logging.level.org.hibernate.type.descriptor.sql.BasicBinder=DEBUG
+
+# Flyway for Database Setup and Migrations
+spring.flyway.enabled=true
+spring.flyway.clean-on-validation-error=true
+spring.flyway.locations=classpath:db/migration
\ No newline at end of file
diff --git a/integration/spring_jpa/src/main/resources/db/migration/V0001__R002_Create_schema.sql b/integration/spring_jpa/src/main/resources/db/migration/V0001__R002_Create_schema.sql
new file mode 100644
index 0000000..45d28bb
--- /dev/null
+++ b/integration/spring_jpa/src/main/resources/db/migration/V0001__R002_Create_schema.sql
@@ -0,0 +1,27 @@
+CREATE SEQUENCE HIBERNATE_SEQUENCE START WITH 100000;
+
+
+CREATE TABLE Booking (
+ id BIGINT NOT NULL AUTO_INCREMENT,
+ modification_counter INTEGER NOT NULL,
+ id_user BIGINT,
+ name VARCHAR (255) NOT NULL,
+ booking_token VARCHAR (255),
+ comment VARCHAR (4000),
+ email VARCHAR(255) NOT NULL,
+ booking_date TIMESTAMP NOT NULL,
+ expiration_date TIMESTAMP,
+ booking_status VARCHAR(1),
+ CONSTRAINT PK_Booking PRIMARY KEY(id)
+);
+
+CREATE TABLE Invited_Guest (
+ id BIGINT NOT NULL AUTO_INCREMENT,
+ modification_counter INTEGER NOT NULL,
+ id_booking BIGINT ,
+ guest_token VARCHAR (255),
+ email VARCHAR (60),
+ accepted BOOLEAN,
+ CONSTRAINT PK_InvitedGuest PRIMARY KEY(id),
+ CONSTRAINT FK_InvitedGuest_idBooking FOREIGN KEY(id_booking) REFERENCES Booking(id) NOCHECK
+);
diff --git a/integration/spring_jpa/src/main/resources/db/migration/V0002__R002_Master_data.sql b/integration/spring_jpa/src/main/resources/db/migration/V0002__R002_Master_data.sql
new file mode 100644
index 0000000..c9c3f80
--- /dev/null
+++ b/integration/spring_jpa/src/main/resources/db/migration/V0002__R002_Master_data.sql
@@ -0,0 +1,31 @@
+INSERT INTO booking(
+ id, modification_counter, id_user,
+ NAME, booking_token, comment, email,
+ booking_date, expiration_date,
+ booking_status
+)
+VALUES
+ (
+ 0, 0, 0,
+ 'user0', 'CB_20170509_123502555Z', 'Booking Type CSR', 'user0@mail.com',
+ Dateadd('DAY', 5, CURRENT_TIMESTAMP),
+ Dateadd(
+ 'DAY',
+ 5,
+ Dateadd('HOUR', -1, CURRENT_TIMESTAMP)
+ ),
+ 'C'
+ );
+INSERT INTO Invited_Guest(
+ id, modification_counter, id_booking,
+ guest_token, email, accepted
+)
+VALUES
+ (
+ 0,
+ 0,
+ 0,
+ 'GB_20170510_02350266501Z',
+ 'guest0@mail.com',
+ true
+ );
\ No newline at end of file
diff --git a/integration/spring_jpa/src/test/java/com/devonfw/examples/dataaccess/springjpa/BookingRepositoryTest.java b/integration/spring_jpa/src/test/java/com/devonfw/examples/dataaccess/springjpa/BookingRepositoryTest.java
new file mode 100644
index 0000000..947c71b
--- /dev/null
+++ b/integration/spring_jpa/src/test/java/com/devonfw/examples/dataaccess/springjpa/BookingRepositoryTest.java
@@ -0,0 +1,111 @@
+package com.devonfw.examples.dataaccess.springjpa;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.time.LocalDateTime;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.persistence.Query;
+import javax.transaction.Transactional;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+import com.devonfw.examples.dataaccess.springjpa.domain.model.BookingEntity;
+import com.devonfw.examples.dataaccess.springjpa.domain.model.BookingStatus;
+import com.devonfw.examples.dataaccess.springjpa.domain.model.InvitedGuestEntity;
+import com.devonfw.examples.dataaccess.springjpa.domain.repository.BookingRepository;
+
+/**
+ * Unit test prepared to test the following features:
+ *
+ * LocalDateTime - BookingDate is time.LocalDateTime instead of util.Date
+ *
+ * Enum (using converter) - BookingStatus is assigned BOOKED but
+ * the database stores only the code 'B'. To verify actual value (code) from the database, applying native
+ * query to retrieve row data.
+ *
+ * Lazy loading - Lazy loading verified by looking at queries applied against database from the logs.
+ * While applying findById executes query to fetch data from booking table not querying against invited
+ * guests. But when we verify `getInvitedGuests().size()` the invited guests query executes.
+ *
+ */
+@ExtendWith(SpringExtension.class)
+@SpringBootTest
+public class BookingRepositoryTest {
+
+ @Autowired
+ private BookingRepository bookingRepository;
+
+ @PersistenceContext
+ private EntityManager em;
+
+ @Test
+ @Transactional
+ public void givenBooking_whenSave_thenGetOk() {
+
+ // Booking + Invited Guests creation
+ BookingEntity newBooking = getBooking("booking1");
+ BookingEntity booking = this.bookingRepository.save(newBooking);
+
+ // Retrieving the booking:
+ Optional foundBooking = this.bookingRepository
+ .findById(booking.getId());
+ if (foundBooking.isPresent()) {
+ booking = foundBooking.get();
+ assertEquals(booking.getName(), newBooking.getName());
+ assertEquals(booking.getBookingDate(), newBooking.getBookingDate());
+ assertEquals(booking.getInvitedGuests().size(), 10);
+ }
+
+ // Native query used here to get the exact Enum data from the DB.
+
+ Query q = this.em.createNativeQuery(
+ "SELECT b.name,b.booking_status FROM Booking b where id="
+ + booking.getId());
+ List