init

.gitignore

+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/

.mvn/wrapper/maven-wrapper.properties

+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.4/apache-maven-3.8.4-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.0/maven-wrapper-3.1.0.jar

Dockerfile

+FROM java:8
+
+EXPOSE 8080
+
+ADD target/demo-api.jar demo-api.jar
+
+ENTRYPOINT [ "java", "demo-api" ]
+

docker-compose.yml

+# https://www.youtube.com/watch?v=329YT1wPyOo
+
+version: '3.1'
+services:
+  db: 
+    image: mysql
+    container_name: mysql-db2
+    restart: always
+    environment:
+      MYSQL_ROOT_PASSWORD:
+      MYSQL_DATABASE: demo-api
+    ports:
+      - "3306:3306"
+    volumes:
+      - C:/xampp/mySQLData/mysql-db2:/var/lib/mysql
+
+# phpmyadmin:
+#   image: phpmyadmin/phpmyadmin:latest
+#   container_name: my-php-myadmin
+#   ports:
+#     -"8082:80"
+#   restart: always
+
+#   depends_on:
+#   - db
+#   environment:
+#   SPRING_DATA_USERNAME: root
+#   SPRING_DATA_PASSWORD: 
+
+# demoapiservice:
+#   image: demo-api-services
+#   container_name: demo-api-services-app
+#   build: 
+#     context: 
+#     dockerfile: Dockerfile
+#   ports: 
+#     -"8080:8080"
+#   restart: always
+#   depends_on:
+#     -db
+#   environment:
+#     SPRING_DATASOURCE_URL: jdbc:mysql://localhost:3306/demoapi
+#     SPRING_DATASOURCE_USERNAME: root
+#     SPRING_DATASOURCE_PASSWORD:

mvnw

+#!/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} $MAVEN_CONFIG "$@"

mvnw.cmd

+@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%

pom.xml

+<?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>2.6.6</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.learn</groupId>
+	<artifactId>demo-api</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>demo-api</name>
+	<description>Demo project for Spring Boot</description>
+	<properties>
+		<java.version>18</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-devtools</artifactId>
+			<scope>runtime</scope>
+			<optional>true</optional>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-jpa</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>mysql</groupId>
+			<artifactId>mysql-connector-java</artifactId>
+			<scope>runtime</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-validation</artifactId>
+		</dependency>
+
+	<dependency>
+			<groupId>org.modelmapper</groupId>
+			<artifactId>modelmapper</artifactId>
+			<version>2.3.5</version> 
+		</dependency>
+	
+   <dependency>
+     <groupId>com.mobntic</groupId>
+     <artifactId>catalog-spring-boot</artifactId>
+     <version>1.0.1</version>
+   </dependency>
+
+	<dependency>
+		<groupId>org.junit.jupiter</groupId>
+		<artifactId>junit-jupiter</artifactId>
+		<version>5.8.2</version>
+	</dependency>
+
+   
+ </dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

src/main/java/com/learn/Calculator.java

+// youtube
+// https://www.youtube.com/watch?v=vZm0lHciFsQ
+// https://www.youtube.com/watch?v=KkYVnj0k6Sw -- juint rest api
+// web
+// https://www.blazemeter.com/blog/spring-boot-rest-api-unit-testing-with-junit
+
+package com.learn;
+
+public class Calculator {
+    
+    public int add (int a, int b){
+        return a - b;
+    }
+}

src/main/java/com/learn/DemoApiApplication.java

+package com.learn;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+
+@SpringBootApplication
+public class DemoApiApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(DemoApiApplication.class, args);
+	}
+
+	@Bean
+	public ModelMapper modelMapper(){
+		return new ModelMapper();
+	}
+}

src/main/java/com/learn/controller/CategoryController.java

+package com.learn.controller;
+
+import java.util.Arrays;
+
+import javax.validation.Valid;
+
+import com.learn.dto.CategoryData;
+import com.learn.dto.ResponseData;
+import com.learn.dto.SearchData;
+import com.learn.models.entities.Category;
+import com.learn.services.CategoryService;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.Errors;
+import org.springframework.validation.ObjectError;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/categories")
+public class CategoryController {
+
+    @Autowired
+    private CategoryService categoryService;
+    
+    @Autowired
+    private ModelMapper modelMapper;
+
+    @PostMapping
+    public ResponseEntity<ResponseData<Category>> create(@Valid @RequestBody CategoryData categoryData, Errors errors){
+        ResponseData<Category> responseData = new ResponseData<>();
+        if(errors.hasErrors()){
+            for (ObjectError error : errors.getAllErrors()) {
+                responseData.getMessage().add(error.getDefaultMessage());
+            }
+            responseData.setStatus(false);
+            responseData.setPayload(null);
+            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(responseData);
+        }
+        Category category = modelMapper.map(categoryData, Category.class);
+
+
+        responseData.setStatus(true);
+        responseData.setPayload(categoryService.save(category));
+        return ResponseEntity.ok(responseData);
+    }
+
+    @GetMapping
+    public Iterable<Category> findAll(){
+        return categoryService.findAll();
+    }
+
+    @GetMapping("/{id}")    
+    public Category findOne(@PathVariable("id") Long id){
+        return categoryService.findOne(id); 
+    }
+
+    @PutMapping
+    public ResponseEntity <ResponseData<Category>> update(@Valid @RequestBody CategoryData categoryData, Errors errors){
+        ResponseData<Category> responseData = new ResponseData<>();
+        if(errors.hasErrors()){
+            for (ObjectError error : errors.getAllErrors()) {
+                responseData.getMessage().add(error.getDefaultMessage());
+            }
+            responseData.setStatus(false);
+            responseData.setPayload(null);
+            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(responseData);
+        }
+
+        Category category = modelMapper.map(categoryData, Category.class);
+        
+        
+        responseData.setStatus(true);
+        responseData.setPayload(categoryService.save(category));
+        return ResponseEntity.ok(responseData);
+    }
+
+
+    @PostMapping("/search/{size}/{page}")
+    public Iterable<Category> findByName( @RequestBody SearchData searchData, @PathVariable("size") int size, 
+    @PathVariable("page") int page ){
+       
+        Pageable pageable = PageRequest.of(page, size);
+       
+        return categoryService.findByName(searchData.getSearchKey(), pageable);
+    }
+
+    @PostMapping("/search/{size}/{page}/{sort}")
+    public Iterable<Category> findByName( @RequestBody SearchData searchData, @PathVariable("size") int size, 
+    @PathVariable("page") int page, @PathVariable("sort") String sort ){
+       
+        // ascending defaul, boleh ga ditulis
+        Pageable pageable = PageRequest.of(page, size, Sort.by("id").ascending());
+        if(sort.equalsIgnoreCase("desc")){
+            pageable = PageRequest.of(page, size, Sort.by("id").descending());
+        }
+       
+        return categoryService.findByName(searchData.getSearchKey(), pageable);
+    }
+
+    @PostMapping("/batch")
+    public ResponseEntity<ResponseData<Iterable<Category>>> createBatch( @RequestBody Category[] categories){
+      
+        ResponseData<Iterable<Category>> responseData = new ResponseData<>();
+        responseData.setPayload(categoryService.saveBatch(Arrays.asList(categories)));
+        responseData.setStatus(true);
+        return ResponseEntity.ok(responseData);
+    }
+}
\ No newline at end of file

src/main/java/com/learn/controller/ProductController.java

+package com.learn.controller;
+
+import java.util.List;
+// import java.util.List;
+import java.util.Random;
+
+import javax.validation.Valid;
+
+import com.learn.dto.ResponseData;
+import com.learn.dto.SearchData;
+import com.learn.models.entities.Product;
+import com.learn.models.entities.Supplier;
+import com.learn.services.ProductService;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.Errors;
+import org.springframework.validation.ObjectError;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/products")
+public class ProductController {
+    
+    //26.64
+
+    // controller pangiil service, service manggil crud repo 
+    @Autowired
+    private ProductService productService;
+
+    @PostMapping
+    public ResponseEntity < ResponseData < Product >> create (@Valid @RequestBody Product product, Errors  errors){
+
+        ResponseData <Product> responseData = new ResponseData<>();
+
+        String uCode = "ABCDEFGHIJKLMNOPQRSTUWVXYZ1234567890";
+        StringBuilder salt = new StringBuilder();
+        Random rnd = new Random();
+
+        while(salt.length() < 15) {
+            int index = (int) (rnd.nextFloat() * uCode.length());
+            salt.append(uCode.charAt(index));
+        }
+        String code2 = salt.toString();
+
+        product.setCode(code2);
+
+        if(errors.hasErrors()){
+            for (ObjectError error : errors.getAllErrors()) {
+              responseData.getMessage().add(error.getDefaultMessage());
+            }
+            responseData.setStatus(false);
+            responseData.setPayload(null);
+            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(responseData);
+        }
+        responseData.setStatus(true);
+        responseData.setPayload(productService.save(product));
+        return ResponseEntity.ok(responseData);
+    }
+
+    @GetMapping
+    public Iterable <Product> findAll(){
+        return productService.findAll();
+    }
+
+    @GetMapping("/{id}")
+    public Product findOne(@PathVariable("id") Long id){
+        return productService.findone(id);
+    }
+
+    // @GetMapping("/{name}")
+    // public List<Product> findByName(@PathVariable("name") String name) {
+    //     return productService.findByName(name);
+    // }
+
+    @PutMapping
+    public ResponseEntity <ResponseData<Product>> update ( @Valid @RequestBody Product product, Errors errors){
+        ResponseData<Product> responseData = new ResponseData<>();
+        if(errors.hasErrors()){
+            for (ObjectError error : errors.getAllErrors()) {
+              responseData.getMessage().add(error.getDefaultMessage());
+            }
+            responseData.setStatus(false);
+            responseData.setPayload(null);
+            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(responseData);
+        }
+        responseData.setStatus(true);
+        responseData.setPayload(productService.save(product));
+        return ResponseEntity.ok(responseData);
+    }
+
+    @DeleteMapping("/{id}")
+    public void removeOne(@PathVariable("id") Long id){
+        productService.removeOne(id);
+        System.out.println("data deleted");
+    }
+
+    @PostMapping("/{id}")
+    public void addSupplier(@RequestBody Supplier supplier, @PathVariable("id") Long productId){
+        productService.addSupplier(supplier, productId);
+    }
+
+    @PostMapping("/search/name")
+    public Product getProductByName(@RequestBody SearchData searchData){
+        return productService.findByProductName(searchData.getSearchKey());
+    }
+
+    @PostMapping("/search/namelike")
+    public List <Product> getProductByNameLike(@RequestBody SearchData searchData){
+        return productService.findByProductNameLike(searchData.getSearchKey());
+    }
+
+    @GetMapping("/search/category/{categoryId}")
+    public List <Product> getProductByCategory(@PathVariable("categoryId") Long categoryId){
+        return productService.findByCategory(categoryId);
+    }
+
+    @GetMapping("/search/supplier/{supplierId}")
+    public List <Product> getProductBySupplier(@PathVariable("supplierId") Long supplierId){
+        return productService.findBySupplier(supplierId);
+    }
+}

src/main/java/com/learn/controller/SupplierController.java

+// youtube vid 6
+// https://www.youtube.com/watch?v=tyXozdaYn8c&list=PLRjWo99hnirwyafPfaxfu0psMR0hUmdQc&index=6 - 37.34
+
+package com.learn.controller;
+
+import java.util.List;
+
+import javax.validation.Valid;
+
+import com.learn.dto.ResponseData;
+import com.learn.dto.SearchData;
+import com.learn.dto.SupplierData;
+import com.learn.models.entities.Supplier;
+import com.learn.services.SupplierService;
+
+import org.modelmapper.ModelMapper;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.Errors;
+import org.springframework.validation.ObjectError;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/suppliers")
+public class SupplierController {
+    
+    @Autowired
+    private SupplierService supplierService;
+
+    @Autowired
+    private ModelMapper modelMapper;
+
+    @PostMapping
+    public ResponseEntity <ResponseData<Supplier>> create(@Valid @RequestBody SupplierData supplierData, Errors errors){
+        ResponseData<Supplier> responseData = new ResponseData<>();
+        if(errors.hasErrors()){
+            for (ObjectError error : errors.getAllErrors()) {
+                responseData.getMessage().add(error.getDefaultMessage());
+            }
+            responseData.setStatus(false);
+            responseData.setPayload(null);
+            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(responseData);
+        }
+
+        // 1. kalo gapake model mapper
+        // Supplier supplier = new Supplier();
+        // supplier.setName(supplierData.getName());
+        // supplier.setAddress(supplierData.getAddress());
+        // supplier.setEmail(supplierData.getEmail());
+
+
+        //2. kalau pake maper
+        Supplier supplier = modelMapper.map(supplierData, Supplier.class);
+
+
+        responseData.setStatus(true);
+        responseData.setPayload(supplierService.save(supplier));
+        return ResponseEntity.ok(responseData);
+    }
+
+    @GetMapping
+    public Iterable<Supplier> findAll(){
+        return supplierService.findAll();
+    }
+
+    @GetMapping("/{id}")
+    public Supplier findOne(@PathVariable("id") Long id){
+        return supplierService.findOne(id);
+    }
+    
+    @PutMapping
+    public ResponseEntity <ResponseData<Supplier>> update(@Valid @RequestBody SupplierData supplierData, Errors errors){
+        ResponseData<Supplier> responseData = new ResponseData<>();
+        if(errors.hasErrors()){
+            for (ObjectError error : errors.getAllErrors()) {
+                responseData.getMessage().add(error.getDefaultMessage());
+            }
+            responseData.setStatus(false);
+            responseData.setPayload(null);
+            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(responseData);
+        }
+
+        Supplier supplier = modelMapper.map(supplierData, Supplier.class);
+
+
+        responseData.setStatus(true);
+        responseData.setPayload(supplierService.save(supplier));
+        return ResponseEntity.ok(responseData);
+    }
+
+    //
+    @PostMapping("/search/byemail")
+    public Supplier findByEmail(@RequestBody SearchData searchData ){
+        return supplierService.findByEmail(searchData.getSearchKey());
+    }
+
+    @PostMapping("/search/byname")
+    public List<Supplier> findByName(@RequestBody SearchData searchData){
+        return supplierService.findByName(searchData.getSearchKey());
+    }
+
+    @PostMapping("/search/bynamestartwith")
+    public List<Supplier> findByNameStartWith(@RequestBody SearchData searchData){
+        return supplierService.findByNameStarWith(searchData.getSearchKey());
+    }
+
+    @PostMapping("/search/bynameoremail")
+    public List<Supplier> findByNameOrEmail(@RequestBody SearchData searchData){
+        return supplierService.findByNameOrEmail(searchData.getSearchKey(), searchData.getOtherSearchKey());
+    }
+
+    //
+
+}
+
+

src/main/java/com/learn/controller/WelcomeController.java

+package com.learn.controller;
+
+// https://www.youtube.com/watch?v=Z0JfmObjKRw - tutorial spring boot - done
+
+import org.springframework.web.bind.annotation.GetMapping;
+// import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/welcome")
+
+public class WelcomeController {
+
+    @GetMapping 
+    public String welcome(){
+        return "welcome to spring boot";
+    }
+
+    // @PostMapping
+    // public String other (){
+    //     return "another data";
+    // }
+}
\ No newline at end of file

src/main/java/com/learn/dto/CategoryData.java

+package com.learn.dto;
+
+import javax.validation.constraints.NotEmpty;
+
+public class CategoryData {
+    
+    @NotEmpty (message = "name is required")
+    private String name;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

src/main/java/com/learn/dto/ResponseData.java

+package com.learn.dto;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ResponseData <T> {
+    private boolean status;
+    private List <String> message = new ArrayList<>();
+    private T payload;
+    
+    public boolean isStatus() {
+        return status;
+    }
+    public void setStatus(boolean status) {
+        this.status = status;
+    }
+    public List<String> getMessage() {
+        return message;
+    }
+    public void setMessage(List<String> message) {
+        this.message = message;
+    }
+    public T getPayload() {
+        return payload;
+    }
+    public void setPayload(T payload) {
+        this.payload = payload;
+    }
+    
+
+}

src/main/java/com/learn/dto/SearchData.java

+package com.learn.dto;
+
+public class SearchData {
+
+    private String searchKey;
+
+    private String otherSearchKey;
+
+    public String getSearchKey() {
+        return searchKey;
+    }
+
+    public void setSearchKey(String searchKey) {
+        this.searchKey = searchKey;
+    }
+
+    public String getOtherSearchKey() {
+        return otherSearchKey;
+    }
+
+    public void setOtherSearchKey(String otherSearchKey) {
+        this.otherSearchKey = otherSearchKey;
+    }
+
+}

src/main/java/com/learn/dto/SupplierData.java

+package com.learn.dto;
+
+import javax.validation.constraints.Email;
+import javax.validation.constraints.NotEmpty;
+
+public class SupplierData{
+    
+    @NotEmpty(message = "Name is Required")
+    private String name;
+    
+    @NotEmpty(message = "Address is Required")
+    private String address;
+    
+    @NotEmpty(message = "Email is Required")
+    @Email(message = "Email is not valid")
+    private String email;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getAddress() {
+        return address;
+    }
+
+    public void setAddress(String address) {
+        this.address = address;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }  
+
+    
+}

src/main/java/com/learn/models/entities/Category.java

+package com.learn.models.entities;
+
+import java.io.Serializable;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+@Entity
+@Table(name="tbl_categories")
+public class Category implements Serializable{
+
+    private static final long serialVersionUID = 1L;
+    
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;  
+    
+    @Column(length = 100, nullable = false, unique = true)
+    private String name;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}

src/main/java/com/learn/models/entities/Product.java

+package com.learn.models.entities;
+
+import java.io.Serializable;
+import java.util.Set;
+
+// import javax.annotation.sql.DataSourceDefinition;
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.JoinColumn;
+import javax.persistence.JoinTable;
+import javax.persistence.ManyToMany;
+import javax.persistence.ManyToOne;
+import javax.persistence.Table;
+import javax.validation.constraints.NotEmpty;
+
+// import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.JsonManagedReference;
+// import com.fasterxml.jackson.annotation.ObjectIdGenerators;
+
+@Entity
+@Table(name = "tbl_product")
+// ini buat gantiin yg json manage ref
+// @JsonIdentityInfo(
+//     generator = ObjectIdGenerators.PropertyGenerator.class,
+//     property = "id"
+// )
+
+public class Product implements Serializable {
+    
+    private static final long serialVersionUID = 1L;
+
+    @Id
+    @GeneratedValue(strategy=GenerationType.IDENTITY)
+    private Long id;
+
+    @NotEmpty ( message = "Name is Required" )
+    @Column(name = "product_name", length = 100)
+    private String name;
+
+    @NotEmpty ( message = "Description is Required" ) 
+    @Column(name = "product_description", length = 500)
+    private String description;
+
+    private double price;
+
+    @ManyToOne
+    private Category category;
+
+    @ManyToMany
+    @JoinTable(
+        name = "tbl_product_supllier",
+        joinColumns = @JoinColumn(name = "product_id"),
+        inverseJoinColumns = @JoinColumn(name = "supplier_id"))
+    // ini biar ga loop pas get product yg kerelasi sama supplier 
+    @JsonManagedReference   
+    private Set<Supplier> suppliers;
+
+    private String code;
+
+    private int stock;
+
+    public String getCode() {
+        return code;
+    }
+
+    public int getStock() {
+        return stock;
+    }
+
+    public void setStock(int stock) {
+        this.stock = stock;
+    }
+
+    public void setCode(String code) {
+        this.code = code;
+    }
+
+    public Product(String code) {
+        this.code = code;
+    }
+
+    public Product() {
+    }
+
+    public Product(Long id, String name, String description, double price) {
+        this.id = id;
+        this.name = name;
+        this.description = description;
+        this.price = price;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public void setPrice(double price) {
+        this.price = price;
+    }
+
+    public Category getCategory() {
+        return category;
+    }
+
+    public void setCategory(Category category) {
+        this.category = category;
+    }
+
+    public Set<Supplier> getSuppliers() {
+        return suppliers;
+    }
+
+    public void setSuppliers(Set<Supplier> suppliers) {
+        this.suppliers = suppliers;
+    } 
+
+
+}

src/main/java/com/learn/models/entities/Supplier.java

+package com.learn.models.entities;
+
+import java.io.Serializable;
+import java.util.Set;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+import javax.persistence.ManyToMany;
+import javax.persistence.Table;
+
+import com.fasterxml.jackson.annotation.JsonBackReference;
+// import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+// import com.fasterxml.jackson.annotation.ObjectIdGenerators;
+// import com.fasterxml.jackson.annotation.JsonIgnore;
+
+@Entity
+@Table(name = "tbl_suppliers")
+// ini buat gantiin yg json manage ref
+// @JsonIdentityInfo(
+//     generator = ObjectIdGenerators.PropertyGenerator.class,
+//     property = "id"
+// )
+public class Supplier implements Serializable{
+
+    private static final long serialVersionUID = 1L;
+    
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @Column(length = 150, nullable = false)
+    private String name;
+
+    @Column(length = 200, nullable = false)
+    private String address;
+
+    @Column(length = 100, nullable = false, unique = true)
+    private String email;
+
+    @ManyToMany(mappedBy = "suppliers")
+    // lanjutan manage ref yg di product.java
+    @JsonBackReference
+    // @JsonIgnore
+    private Set<Product> products;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getAddress() {
+        return address;
+    }
+
+    public void setAddress(String address) {
+        this.address = address;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public Set<Product> getProducts() {
+        return products;
+    }
+
+    public void setProducts(Set<Product> products) {
+        this.products = products;
+    }
+
+    public Object existsById(int i) {
+        return null;
+    }
+
+    
+}

src/main/java/com/learn/models/repos/CategoryRepo.java

+package com.learn.models.repos;
+
+import com.learn.models.entities.Category;
+
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+// import org.springframework.data.repository.CrudRepository;
+import org.springframework.data.repository.PagingAndSortingRepository;
+
+public interface CategoryRepo extends PagingAndSortingRepository <Category, Long> { 
+
+    Page<Category> findByNameContains (String name, Pageable pageable);
+    
+}

src/main/java/com/learn/models/repos/ProductRepo.java

+
+package com.learn.models.repos;
+
+import java.util.List;
+
+import javax.websocket.server.PathParam;
+
+import com.learn.models.entities.Product;
+import com.learn.models.entities.Supplier;
+
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.CrudRepository;
+
+
+// ini pake repo buat create update delete
+public interface ProductRepo extends CrudRepository <Product,Long> {
+    
+    // ini custom function
+
+    public List<Product> findByNameContaining(String name);
+
+    @Query("SELECT p FROM Product p WHERE p.name = :name")
+    public Product findProductByName (@PathParam("name") String name);
+
+    @Query("SELECT p FROM Product p WHERE p.name LIKE :name")
+    public List <Product> findProductByNameLike (@PathParam("name") String name);
+
+    @Query("SELECT p FROM Product p WHERE p.category.id = :categoryId")
+    public List<Product> findProductByCategory(@PathParam("categoryId") Long categoryId);
+
+    @Query("SELECT p FROM Product p WHERE :supplier MEMBER OF p.suppliers")
+    public List <Product> findProductBySupplier(@PathParam("supplier") Supplier supplier);
+}

src/main/java/com/learn/models/repos/SupplierRepo.java

+package com.learn.models.repos;
+
+import java.util.List;
+
+import com.learn.models.entities.Supplier;
+
+import org.springframework.data.repository.CrudRepository;
+
+public interface SupplierRepo extends CrudRepository <Supplier, Long> {
+    
+
+    //
+    Supplier findByEmail(String email);
+
+    List <Supplier> findByNameContains(String name);
+
+    List <Supplier> findByNameStartingWith(String prefix);
+
+    List <Supplier> findByNameOrEmailContains(String name, String email);
+    //
+}

src/main/java/com/learn/services/CategoryService.java

+package com.learn.services;
+
+import java.util.Optional;
+
+import javax.transaction.Transactional;
+
+import com.learn.models.entities.Category;
+import com.learn.models.repos.CategoryRepo;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Pageable;
+import org.springframework.stereotype.Service;
+
+@Service
+@Transactional
+public class CategoryService {
+    
+    @Autowired
+    private CategoryRepo categoryRepo;
+
+
+    public Category save (Category category){
+        return  categoryRepo.save(category);
+    }
+
+    public Category findOne(Long id){
+        Optional<Category> category = categoryRepo.findById(id);
+        if(!category.isPresent()){
+            return null;
+        }
+        return category.get();
+    }
+
+    public Iterable<Category> findAll(){
+        return categoryRepo.findAll();
+    }
+
+    public void removeOne(Long id){
+        categoryRepo.deleteById(id);
+    }
+
+    public Iterable<Category> findByName(String name, Pageable pageable){
+        return categoryRepo.findByNameContains(name, pageable);
+    }
+
+    public Iterable<Category> saveBatch(Iterable<Category>categories){
+        return categoryRepo.saveAll(categories);
+    }
+}

src/main/java/com/learn/services/ProductService.java

+// bisnis logic
+
+package com.learn.services;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+// import java.util.UUID;
+
+import javax.transaction.Transactional;
+
+import com.learn.models.entities.Product;
+import com.learn.models.entities.Supplier;
+import com.learn.models.repos.ProductRepo;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+// import net.bytebuddy.utility.RandomString;
+
+@Service
+@Transactional
+public class ProductService {
+
+    @Autowired
+    private ProductRepo productRepo;
+
+    @Autowired
+    private SupplierService supplierService;
+
+    // yg .save - .deleteById, itu function yng udah ada dri crud repo
+    public Product save (Product product){
+        return productRepo.save(product);
+    }
+
+    public Product findone(Long id){
+        Optional <Product> product = productRepo.findById(id);
+
+        if(!product.isPresent()){
+            return null;
+        }
+        return productRepo.findById(id).get();
+    }
+
+    public Iterable<Product> findAll(){
+        return productRepo.findAll();
+    }
+
+    public void removeOne(Long id){
+        productRepo.deleteById(id);
+    }
+
+    // ini yg custom function (diketik manual di ProductRepo.java) 
+    public List<Product> findByName(String name){
+        // List<Product> product = productRepo.findByNameContains(name);
+
+        // if(!product.isEmpty()){
+        //     return null;
+        // }
+
+        List<Product> resp = productRepo.findByNameContaining(name);
+
+
+        return resp;
+    }
+
+    public void addSupplier(Supplier supplier, Long productId){
+        Product product = findone(productId);
+
+        if(product == null){
+            throw new RuntimeException("Product with id: "+productId+" not found ");
+        }
+        product.getSuppliers().add(supplier);
+        save(product);
+    }
+    
+    public Product findByProductName(String name){
+        return productRepo.findProductByName(name);
+    }
+
+    public List<Product> findByProductNameLike( String name){
+        return productRepo.findProductByNameLike("%"+name+"%");
+    }
+
+    public List<Product> findByCategory(Long categoryId){
+        return productRepo.findProductByCategory(categoryId);
+    }
+
+    public List<Product> findBySupplier (Long supplierId){
+        Supplier supplier =  supplierService.findOne(supplierId);
+        if(supplier == null){
+            return new ArrayList<Product>();
+        }
+        return productRepo.findProductBySupplier(supplier);
+    }
+}

src/main/java/com/learn/services/SupplierService.java

+package com.learn.services;
+
+import java.util.List;
+import java.util.Optional;
+
+import javax.transaction.Transactional;
+
+import com.learn.models.entities.Supplier;
+import com.learn.models.repos.SupplierRepo;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+
+@Service
+@Transactional
+public class SupplierService {
+
+    @Autowired
+    private SupplierRepo supplierRepo;
+    
+    public Supplier findOne(Long id){
+        Optional<Supplier> supplier = supplierRepo.findById(id);
+        if(!supplier.isPresent()){
+            return null;
+        }
+        return supplier.get();
+    }
+
+    public Iterable <Supplier> findAll(){
+        return supplierRepo.findAll();
+    }
+
+    public void removeOne(Long id){
+        supplierRepo.deleteById(id);
+    }
+
+    public Supplier save(Supplier supplier) {
+        return supplierRepo.save(supplier);
+    }
+
+    //
+    public Supplier findByEmail(String email){
+        return supplierRepo.findByEmail(email);
+    }
+
+    public List <Supplier> findByName(String name){
+        return supplierRepo.findByNameContains(name);
+    }
+
+    public List <Supplier> findByNameStarWith(String prefix){
+        return supplierRepo.findByNameStartingWith(prefix);
+    }
+
+    public List <Supplier> findByNameOrEmail (String name, String email){
+        return supplierRepo.findByNameOrEmailContains(name, email);
+    }
+
+    //
+}

src/main/resources/application.properties

+spring.datasource.url=jdbc:mysql://localhost:3306/demoapi
+spring.datasource.username=root
+spring.datasource.password=
+
+spring.jpa.hibernate.ddl-auto=update
+spring.jpa.show-sql=true
+

src/test/java/com/learn/CalculatorTest.java

+package com.learn;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class CalculatorTest {
+
+
+    @Test
+    void testAdd() {
+        var calcu = new Calculator();
+        assertEquals(5 , calcu.add(7,2));
+    }
+
+    @Test
+    void testAd2() {
+        var calcu = new Calculator();
+        assertEquals(6 , calcu.add(8,2));
+    }
+}

src/test/java/com/learn/demoapi/DemoApiApplicationTests.java

+package com.learn.demoapi;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+// import com.learn.models.entities.Product;
+
+// import static org.hamcrest.MatcherAssert.assertThat;
+
+
+import com.learn.models.entities.Supplier;
+import com.learn.models.repos.ProductRepo;
+import com.learn.models.repos.SupplierRepo;
+
+import org.junit.jupiter.api.Order;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestMethodOrder;
+import org.junit.jupiter.api.MethodOrderer.OrderAnnotation;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+@TestMethodOrder(OrderAnnotation.class)
+class DemoApiApplicationTests {
+
+
+	private Object assertThat(boolean existsById) {
+		return null;
+	}
+
+	@Autowired
+	SupplierRepo sRepo;
+	ProductRepo pRepo;
+
+	@Test
+	@Order(1)
+	void contextLoads() {
+	}
+
+	@Test
+	@Order(2)
+	public void testCreateSupp(){
+		Supplier s = new Supplier();
+		s.setName("supplier 4");
+		s.setAddress("malang");
+		s.setEmail("malang@gmail.com");
+		sRepo.save(s);
+		assertNotNull(sRepo.findByEmail(s.getEmail()));
+	}
+
+	@Test
+	@Order(3)
+	public void testReadSupp(){
+		Supplier s = sRepo.findByEmail("malang@gmail.com");
+		assertEquals("malang", s.getAddress());
+	}
+
+	@Test
+	@Order(4)
+	public void testUpdateSupp(){
+		Supplier s = sRepo.findByEmail("malang@gmail.com");
+		s.setAddress("Malang Utara");
+		sRepo.save(s);
+		assertNotEquals("malang", sRepo.findByEmail(s.getEmail()));	
+	}
+
+	@Test
+	@Order(5)
+	public void testDelSupp(){
+		Supplier s = sRepo.findByEmail("malang@gmail.com");
+		var idS = s.getId();
+		sRepo.deleteById(idS);
+		assertThat(sRepo.existsById(idS));
+	}
+
+	// @Test
+	// @Order(6)
+	// public void testCreateProd(){
+	// 	Product p = new Product();
+	// 	p.setName("Produk baru");
+	// 	p.setDescription("Besi");
+	// 	p.setPrice(20000);
+	// 	p.setStock(100);
+	// 	pRepo.save(p);
+	// 	assertNotNull(pRepo.findProductByName("Produk baru"));
+	// }
+
+	// @Test
+	// @Order(7)
+	// public void testReadProd(){
+	// 	Supplier s = sRepo.findByEmail("malang@gmail.com");
+	// 	assertEquals("malang", s.getAddress());
+	// }
+
+	// @Test
+	// @Order(8)
+	// public void testUpdateProd(){
+	// 	Supplier s = sRepo.findByEmail("malang@gmail.com");
+	// 	s.setAddress("Malang Utara");
+	// 	sRepo.save(s);
+	// 	assertNotEquals("malang", sRepo.findByEmail(s.getEmail()));	
+	// }
+
+	// @Test
+	// @Order(9)
+	// public void testDelProd(){
+	// 	Supplier s = sRepo.findByEmail("malang@gmail.com");
+	// 	var idS = s.getId();
+	// 	sRepo.deleteById(idS);
+	// 	assertThat(sRepo.existsById(idS));
+	// }
+
+}