diff --git a/spring-boot/hazelcast/hazelcast-client-server/.gitignore b/spring-boot/hazelcast/hazelcast-client-server/.gitignore
new file mode 100644
index 0000000..6c01878
--- /dev/null
+++ b/spring-boot/hazelcast/hazelcast-client-server/.gitignore
@@ -0,0 +1,32 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**
+!**/src/test/**
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
diff --git a/spring-boot/hazelcast/hazelcast-client-server/build.gradle b/spring-boot/hazelcast/hazelcast-client-server/build.gradle
new file mode 100644
index 0000000..09fcb25
--- /dev/null
+++ b/spring-boot/hazelcast/hazelcast-client-server/build.gradle
@@ -0,0 +1,35 @@
+plugins {
+    id 'org.springframework.boot' version '2.3.0.RELEASE'
+    id 'io.spring.dependency-management' version '1.0.9.RELEASE'
+    id 'java'
+}
+
+group = 'io.reflectoring'
+version = '0.0.1-SNAPSHOT'
+sourceCompatibility = '1.8'
+
+configurations {
+    compileOnly {
+        extendsFrom annotationProcessor
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'org.springframework.boot:spring-boot-starter-web'
+    compileOnly 'org.projectlombok:lombok'
+    annotationProcessor 'org.projectlombok:lombok'
+    compile group: 'com.hazelcast', name: 'hazelcast-client', version: '3.12.7'
+    testImplementation('org.springframework.boot:spring-boot-starter-test') {
+        exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
+    }
+    testCompile "org.testcontainers:testcontainers:1.12.5"
+    testCompile "org.testcontainers:junit-jupiter:1.12.5"
+}
+
+test {
+    useJUnitPlatform()
+}
diff --git a/spring-boot/hazelcast/hazelcast-client-server/gradle/wrapper/gradle-wrapper.jar b/spring-boot/hazelcast/hazelcast-client-server/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..f3d88b1
Binary files /dev/null and b/spring-boot/hazelcast/hazelcast-client-server/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/spring-boot/hazelcast/hazelcast-client-server/gradle/wrapper/gradle-wrapper.properties b/spring-boot/hazelcast/hazelcast-client-server/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..a4b4429
--- /dev/null
+++ b/spring-boot/hazelcast/hazelcast-client-server/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/spring-boot/hazelcast/hazelcast-client-server/gradlew b/spring-boot/hazelcast/hazelcast-client-server/gradlew
new file mode 100644
index 0000000..536f027
--- /dev/null
+++ b/spring-boot/hazelcast/hazelcast-client-server/gradlew
@@ -0,0 +1,183 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed 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.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+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
+SAVED="$(pwd)"
+cd "$(dirname \"$PRG\")/" >/dev/null
+APP_HOME="$(pwd -P)"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=$(basename "$0")
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn() {
+  echo "$*"
+}
+
+die() {
+  echo
+  echo "$*"
+  echo
+  exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$(uname)" in
+CYGWIN*)
+  cygwin=true
+  ;;
+Darwin*)
+  darwin=true
+  ;;
+MINGW*)
+  msys=true
+  ;;
+NONSTOP*)
+  nonstop=true
+  ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$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="$JAVA_HOME/bin/java"
+  fi
+  if [ ! -x "$JAVACMD" ]; then
+    die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+  fi
+else
+  JAVACMD="java"
+  which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ]; then
+  MAX_FD_LIMIT=$(ulimit -H -n)
+  if [ $? -eq 0 ]; then
+    if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ]; then
+      MAX_FD="$MAX_FD_LIMIT"
+    fi
+    ulimit -n $MAX_FD
+    if [ $? -ne 0 ]; then
+      warn "Could not set maximum file descriptor limit: $MAX_FD"
+    fi
+  else
+    warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+  fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+  GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ]; then
+  APP_HOME=$(cygpath --path --mixed "$APP_HOME")
+  CLASSPATH=$(cygpath --path --mixed "$CLASSPATH")
+  JAVACMD=$(cygpath --unix "$JAVACMD")
+
+  # We build the pattern for arguments to be converted via cygpath
+  ROOTDIRSRAW=$(find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null)
+  SEP=""
+  for dir in $ROOTDIRSRAW; do
+    ROOTDIRS="$ROOTDIRS$SEP$dir"
+    SEP="|"
+  done
+  OURCYGPATTERN="(^($ROOTDIRS))"
+  # Add a user-defined pattern to the cygpath arguments
+  if [ "$GRADLE_CYGPATTERN" != "" ]; then
+    OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+  fi
+  # Now convert the arguments - kludge to limit ourselves to /bin/sh
+  i=0
+  for arg in "$@"; do
+    CHECK=$(echo "$arg" | egrep -c "$OURCYGPATTERN" -)
+    CHECK2=$(echo "$arg" | egrep -c "^-") ### Determine if an option
+
+    if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ]; then ### Added a condition
+      eval $(echo args$i)=$(cygpath --path --ignore --mixed "$arg")
+    else
+      eval $(echo args$i)="\"$arg\""
+    fi
+    i=$(expr $i + 1)
+  done
+  case $i in
+  0) set -- ;;
+  1) set -- "$args0" ;;
+  2) set -- "$args0" "$args1" ;;
+  3) set -- "$args0" "$args1" "$args2" ;;
+  4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+  5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+  6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+  7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+  8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+  9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+  esac
+fi
+
+# Escape application args
+save() {
+  for i; do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/"; done
+  echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/spring-boot/hazelcast/hazelcast-client-server/gradlew.bat b/spring-boot/hazelcast/hazelcast-client-server/gradlew.bat
new file mode 100644
index 0000000..62bd9b9
--- /dev/null
+++ b/spring-boot/hazelcast/hazelcast-client-server/gradlew.bat
@@ -0,0 +1,103 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem 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, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/spring-boot/hazelcast/hazelcast-client-server/settings.gradle b/spring-boot/hazelcast/hazelcast-client-server/settings.gradle
new file mode 100644
index 0000000..ad2c030
--- /dev/null
+++ b/spring-boot/hazelcast/hazelcast-client-server/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = 'hazelcast-client-server'
diff --git a/spring-boot/hazelcast/hazelcast-client-server/src/main/java/io/reflectoring/cache/cleint/HazelcastClientServerApplication.java b/spring-boot/hazelcast/hazelcast-client-server/src/main/java/io/reflectoring/cache/cleint/HazelcastClientServerApplication.java
new file mode 100644
index 0000000..52bf632
--- /dev/null
+++ b/spring-boot/hazelcast/hazelcast-client-server/src/main/java/io/reflectoring/cache/cleint/HazelcastClientServerApplication.java
@@ -0,0 +1,13 @@
+package io.reflectoring.cache.cleint;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class HazelcastClientServerApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(HazelcastClientServerApplication.class, args);
+    }
+
+}
diff --git a/spring-boot/hazelcast/hazelcast-client-server/src/main/java/io/reflectoring/cache/cleint/client/CacheClient.java b/spring-boot/hazelcast/hazelcast-client-server/src/main/java/io/reflectoring/cache/cleint/client/CacheClient.java
new file mode 100644
index 0000000..48f50ea
--- /dev/null
+++ b/spring-boot/hazelcast/hazelcast-client-server/src/main/java/io/reflectoring/cache/cleint/client/CacheClient.java
@@ -0,0 +1,25 @@
+package io.reflectoring.cache.cleint.client;
+
+import com.hazelcast.client.HazelcastClient;
+import com.hazelcast.core.HazelcastInstance;
+import com.hazelcast.core.IMap;
+import io.reflectoring.cache.cleint.rest.Car;
+import org.springframework.stereotype.Component;
+
+@Component
+public class CacheClient {
+
+    private static final String CARS = "cars";
+
+    private HazelcastInstance client = HazelcastClient.newHazelcastClient();
+
+    public Car put(String key, Car car){
+        IMap<Object, Object> map = client.getMap(CARS);
+        return (Car) map.put(key, car);
+    }
+
+    public Car get(String key){
+        IMap<Object, Object> map = client.getMap(CARS);
+        return (Car) map.get(key);
+    }
+}
diff --git a/spring-boot/hazelcast/hazelcast-client-server/src/main/java/io/reflectoring/cache/cleint/rest/Car.java b/spring-boot/hazelcast/hazelcast-client-server/src/main/java/io/reflectoring/cache/cleint/rest/Car.java
new file mode 100644
index 0000000..4eb0a98
--- /dev/null
+++ b/spring-boot/hazelcast/hazelcast-client-server/src/main/java/io/reflectoring/cache/cleint/rest/Car.java
@@ -0,0 +1,17 @@
+package io.reflectoring.cache.cleint.rest;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.io.Serializable;
+
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class Car implements Serializable {
+    private String color;
+    private String name;
+}
diff --git a/spring-boot/hazelcast/hazelcast-client-server/src/main/java/io/reflectoring/cache/cleint/rest/Controller.java b/spring-boot/hazelcast/hazelcast-client-server/src/main/java/io/reflectoring/cache/cleint/rest/Controller.java
new file mode 100644
index 0000000..9648e48
--- /dev/null
+++ b/spring-boot/hazelcast/hazelcast-client-server/src/main/java/io/reflectoring/cache/cleint/rest/Controller.java
@@ -0,0 +1,28 @@
+package io.reflectoring.cache.cleint.rest;
+
+import io.reflectoring.cache.cleint.client.CacheClient;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping(path = "/cars")
+public class Controller {
+
+    private final CacheClient cacheClient;
+
+    public Controller(CacheClient cacheClient) {
+        this.cacheClient = cacheClient;
+    }
+
+    @PostMapping(value = "/{number}",produces = MediaType.APPLICATION_JSON_VALUE)
+    @ResponseStatus(code = HttpStatus.CREATED)
+    public Car put(@RequestBody Car car, @PathVariable String number) {
+        return cacheClient.put(number, car);
+    }
+
+    @GetMapping(value = "/{number}", produces = MediaType.APPLICATION_JSON_VALUE)
+    public Car get(@PathVariable String number) {
+        return cacheClient.get(number);
+    }
+}
diff --git a/spring-boot/hazelcast/hazelcast-client-server/src/main/resources/application.properties b/spring-boot/hazelcast/hazelcast-client-server/src/main/resources/application.properties
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/spring-boot/hazelcast/hazelcast-client-server/src/main/resources/application.properties
@@ -0,0 +1 @@
+
diff --git a/spring-boot/hazelcast/hazelcast-client-server/src/test/java/io/reflectoring/cache/cleint/AbstractIntegrationTest.java b/spring-boot/hazelcast/hazelcast-client-server/src/test/java/io/reflectoring/cache/cleint/AbstractIntegrationTest.java
new file mode 100644
index 0000000..de2dc08
--- /dev/null
+++ b/spring-boot/hazelcast/hazelcast-client-server/src/test/java/io/reflectoring/cache/cleint/AbstractIntegrationTest.java
@@ -0,0 +1,22 @@
+package io.reflectoring.cache.cleint;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.testcontainers.containers.FixedHostPortGenericContainer;
+import org.testcontainers.containers.GenericContainer;
+
+public class AbstractIntegrationTest {
+
+  static GenericContainer firstMember =
+      new FixedHostPortGenericContainer("hazelcast/hazelcast:3.12.7")
+          .withFixedExposedPort(5701, 5701);
+
+  static GenericContainer secondMember =
+      new FixedHostPortGenericContainer("hazelcast/hazelcast:3.12.7")
+          .withFixedExposedPort(5702, 5701);
+
+  @BeforeAll
+  public static void init() {
+    firstMember.start();
+    secondMember.start();
+  }
+}
diff --git a/spring-boot/hazelcast/hazelcast-client-server/src/test/java/io/reflectoring/cache/cleint/rest/ControllerTest.java b/spring-boot/hazelcast/hazelcast-client-server/src/test/java/io/reflectoring/cache/cleint/rest/ControllerTest.java
new file mode 100644
index 0000000..8ea499a
--- /dev/null
+++ b/spring-boot/hazelcast/hazelcast-client-server/src/test/java/io/reflectoring/cache/cleint/rest/ControllerTest.java
@@ -0,0 +1,50 @@
+package io.reflectoring.cache.cleint.rest;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import io.reflectoring.cache.cleint.AbstractIntegrationTest;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@SpringBootTest
+@AutoConfigureMockMvc
+class ControllerTest extends AbstractIntegrationTest {
+
+  @Autowired private MockMvc mockMvc;
+
+  @Autowired private ObjectMapper objectMapper;
+
+  @Test
+  void putGet() throws Exception {
+    // given
+    String number = "BO5489";
+    Car car = Car.builder().color(number).name("VW").build();
+
+    // put
+    String content = objectMapper.writeValueAsString(car);
+    mockMvc
+        .perform(
+            post("/cars/" + number).content(content).contentType(MediaType.APPLICATION_JSON_VALUE))
+        .andExpect(status().isCreated());
+
+    // get
+    String json =
+        mockMvc
+            .perform(get("/cars/" + number))
+            .andExpect(status().isOk())
+            .andReturn()
+            .getResponse()
+            .getContentAsString();
+    Car response = objectMapper.readValue(json, Car.class);
+
+    assertThat(response).isEqualToComparingFieldByField(car);
+  }
+}