[SBK] Added initial version of files

Added initial version of files

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 "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$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="`which 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/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+    else
+      jarUrl="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.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 "$wrapperJarPath"
+        else
+            wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath"
+        fi
+    elif command -v curl > /dev/null; then
+        if [ "$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" \
+  $MAVEN_OPTS \
+  -classpath "$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 "%HOME%\mavenrc_pre.bat" call "%HOME%\mavenrc_pre.bat"
+if exist "%HOME%\mavenrc_pre.cmd" call "%HOME%\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/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+
+FOR /F "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%/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.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 "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat"
+if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\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%
+
+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>2.2.4.RELEASE</version>
+		<relativePath /> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.example</groupId>
+	<artifactId>spring-boot-kafka</artifactId>
+	<version>1.0-SNAPSHOT</version>
+	<name>spring-boot-kafka</name>
+	<description>Demo project for Spring Boot and Kafka Integration</description>
+
+	<properties>
+		<java.version>1.8</java.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.kafka</groupId>
+			<artifactId>spring-kafka</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>org.junit.vintage</groupId>
+					<artifactId>junit-vintage-engine</artifactId>
+				</exclusion>
+			</exclusions>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.kafka</groupId>
+			<artifactId>spring-kafka-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>com.fasterxml.jackson.core</groupId>
+			<artifactId>jackson-databind</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+			<version>1.18.8</version>
+			<scope>provided</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

src/main/java/com/springboot/kafka/SpringBootKafkaApplication.java

+package com.springboot.kafka;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.kafka.annotation.TopicPartition;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.kafka.support.KafkaHeaders;
+import org.springframework.kafka.support.SendResult;
+import org.springframework.messaging.handler.annotation.Header;
+import org.springframework.messaging.handler.annotation.Payload;
+import org.springframework.util.concurrent.ListenableFuture;
+import org.springframework.util.concurrent.ListenableFutureCallback;
+
+import com.springboot.kafka.pojo.Greeting;
+
+@SpringBootApplication
+public class SpringBootKafkaApplication {
+
+	public static void main(String[] args) throws InterruptedException {
+		ConfigurableApplicationContext context = SpringApplication.run(SpringBootKafkaApplication.class, args);
+
+		MessageProducer producer = context.getBean(MessageProducer.class);
+		MessageListener listener = context.getBean(MessageListener.class);
+		/*
+		 * Sending a Hello World message to topic 'kafkaexample'. Must be received by both
+		 * listeners with group test and sample with containerFactory
+		 * testKafkaListenerContainerFactory and sampleKafkaListenerContainerFactory
+		 * respectively. It will also be received by the listener with
+		 * headersKafkaListenerContainerFactory as container factory
+		 */
+		producer.sendMessage("Hello, World!");
+		listener.latch.await(10, TimeUnit.SECONDS);
+
+		/*
+		 * Sending message to a topic with 5 partition, each message to a different
+		 * partition. But as per listener configuration, only the messages from
+		 * partition 0 and 3 will be consumed.
+		 */
+		for (int i = 0; i < 5; i++) {
+			producer.sendMessageToPartion("Hello To Partioned Topic!", i);
+		}
+		listener.partitionLatch.await(10, TimeUnit.SECONDS);
+
+		/*
+		 * Sending message to 'filtered' topic. As per listener configuration, all
+		 * messages with char sequence 'World' will be discarded.
+		 */
+		producer.sendMessageToFiltered("Hello Rajesh!");
+		producer.sendMessageToFiltered("Hello World!");
+		listener.filterLatch.await(10, TimeUnit.SECONDS);
+
+		/*
+		 * Sending message to 'greeting' topic. This will send and recieved a java
+		 * object with the help of greetingKafkaListenerContainerFactory.
+		 */
+		producer.sendGreetingMessage(new Greeting("Greetings", "World!"));
+		listener.greetingLatch.await(10, TimeUnit.SECONDS);
+
+		context.close();
+	}
+
+	@Bean
+	public MessageProducer messageProducer() {
+		return new MessageProducer();
+	}
+
+	@Bean
+	public MessageListener messageListener() {
+		return new MessageListener();
+	}
+
+	public static class MessageProducer {
+
+		@Autowired
+		private KafkaTemplate<String, String> kafkaTemplate;
+
+		@Autowired
+		private KafkaTemplate<String, Greeting> greetingKafkaTemplate;
+
+		@Value(value = "${message.topic.name}")
+		private String topicName;
+
+		@Value(value = "${partitioned.topic.name}")
+		private String partionedTopicName;
+
+		@Value(value = "${filtered.topic.name}")
+		private String filteredTopicName;
+
+		@Value(value = "${greeting.topic.name}")
+		private String greetingTopicName;
+
+		public void sendMessage(String message) {
+
+			ListenableFuture<SendResult<String, String>> future = kafkaTemplate.send(topicName, message);
+
+			future.addCallback(new ListenableFutureCallback<SendResult<String, String>>() {
+
+				@Override
+				public void onSuccess(SendResult<String, String> result) {
+					System.out.println(
+							"Sent message=[" + message + "] with offset=[" + result.getRecordMetadata().offset() + "]");
+				}
+
+				@Override
+				public void onFailure(Throwable ex) {
+					System.out.println("Unable to send message=[" + message + "] due to : " + ex.getMessage());
+				}
+			});
+		}
+
+		public void sendMessageToPartion(String message, int partition) {
+			kafkaTemplate.send(partionedTopicName, partition, null, message);
+		}
+
+		public void sendMessageToFiltered(String message) {
+			kafkaTemplate.send(filteredTopicName, message);
+		}
+
+		public void sendGreetingMessage(Greeting greeting) {
+			greetingKafkaTemplate.send(greetingTopicName, greeting);
+		}
+	}
+
+	public static class MessageListener {
+
+		private CountDownLatch latch = new CountDownLatch(3);
+
+		private CountDownLatch partitionLatch = new CountDownLatch(2);
+
+		private CountDownLatch filterLatch = new CountDownLatch(2);
+
+		private CountDownLatch greetingLatch = new CountDownLatch(1);
+
+		@KafkaListener(topics = "${message.topic.name}", groupId = "test", containerFactory = "testKafkaListenerContainerFactory")
+		public void listenGroupTest(String message) {
+			System.out.println("Received Messasge in group 'test': " + message);
+			latch.countDown();
+		}
+
+		@KafkaListener(topics = "${message.topic.name}", groupId = "sample", containerFactory = "sampleKafkaListenerContainerFactory")
+		public void listenGroupSample(String message) {
+			System.out.println("Received Messasge in group 'sample': " + message);
+			latch.countDown();
+		}
+
+		@KafkaListener(topics = "${message.topic.name}", containerFactory = "headersKafkaListenerContainerFactory")
+		public void listenWithHeaders(@Payload String message,
+				@Header(KafkaHeaders.RECEIVED_PARTITION_ID) int partition) {
+			System.out.println("Received Messasge: " + message + " from partition: " + partition);
+			latch.countDown();
+		}
+
+		@KafkaListener(topicPartitions = @TopicPartition(topic = "${partitioned.topic.name}", partitions = { "0",
+				"3" }))
+		public void listenToParition(@Payload String message,
+				@Header(KafkaHeaders.RECEIVED_PARTITION_ID) int partition) {
+			System.out.println("Received Message: " + message + " from partition: " + partition);
+			this.partitionLatch.countDown();
+		}
+
+		@KafkaListener(topics = "${filtered.topic.name}", containerFactory = "filterKafkaListenerContainerFactory")
+		public void listenWithFilter(String message) {
+			System.out.println("Recieved Message in filtered listener: " + message);
+			this.filterLatch.countDown();
+		}
+
+		@KafkaListener(topics = "${greeting.topic.name}", containerFactory = "greetingKafkaListenerContainerFactory")
+		public void greetingListener(Greeting greeting) {
+			System.out.println("Recieved greeting message: " + greeting);
+			this.greetingLatch.countDown();
+		}
+
+	}
+
+}

src/main/java/com/springboot/kafka/consumer/KafkaConsumerConfig.java

+/**
+ * 
+ */
+package com.springboot.kafka.consumer;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.common.serialization.StringDeserializer;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.kafka.annotation.EnableKafka;
+import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
+import org.springframework.kafka.core.ConsumerFactory;
+import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
+import org.springframework.kafka.support.serializer.JsonDeserializer;
+
+import com.springboot.kafka.pojo.Greeting;
+
+/**
+ * @author vrajesh
+ *
+ */
+@EnableKafka
+@Configuration
+public class KafkaConsumerConfig {
+	@Value(value = "${kafka.bootstrapAddress}")
+	private String bootstrapAddress;
+
+	public ConsumerFactory<String, String> consumerFactory(String groupId) {
+		Map<String, Object> props = new HashMap<>();
+		props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
+		props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
+		props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
+		props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
+		return new DefaultKafkaConsumerFactory<>(props);
+	}
+
+	public ConcurrentKafkaListenerContainerFactory<String, String> kafkaListenerContainerFactory(String groupId) {
+		ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
+		factory.setConsumerFactory(consumerFactory(groupId));
+		return factory;
+	}
+
+	@Bean
+	public ConcurrentKafkaListenerContainerFactory<String, String> testKafkaListenerContainerFactory() {
+		return kafkaListenerContainerFactory("test");
+	}
+
+	@Bean
+	public ConcurrentKafkaListenerContainerFactory<String, String> sampleKafkaListenerContainerFactory() {
+		return kafkaListenerContainerFactory("sample");
+	}
+
+	@Bean
+	public ConcurrentKafkaListenerContainerFactory<String, String> headersKafkaListenerContainerFactory() {
+		return kafkaListenerContainerFactory("headers");
+	}
+
+	@Bean
+	public ConcurrentKafkaListenerContainerFactory<String, String> partitionsKafkaListenerContainerFactory() {
+		return kafkaListenerContainerFactory("partitions");
+	}
+
+	@Bean
+	public ConcurrentKafkaListenerContainerFactory<String, String> filterKafkaListenerContainerFactory() {
+		ConcurrentKafkaListenerContainerFactory<String, String> factory = kafkaListenerContainerFactory("filter");
+		factory.setRecordFilterStrategy(record -> record.value().contains("World"));
+		return factory;
+	}
+
+	public ConsumerFactory<String, Greeting> greetingConsumerFactory() {
+		Map<String, Object> props = new HashMap<>();
+		props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
+		props.put(ConsumerConfig.GROUP_ID_CONFIG, "greeting");
+		return new DefaultKafkaConsumerFactory<>(props, new StringDeserializer(),
+				new JsonDeserializer<>(Greeting.class));
+	}
+
+	@Bean
+	public ConcurrentKafkaListenerContainerFactory<String, Greeting> greetingKafkaListenerContainerFactory() {
+		ConcurrentKafkaListenerContainerFactory<String, Greeting> factory = new ConcurrentKafkaListenerContainerFactory<>();
+		factory.setConsumerFactory(greetingConsumerFactory());
+		return factory;
+	}
+
+}

src/main/java/com/springboot/kafka/pojo/Greeting.java

+/**
+ * 
+ */
+package com.springboot.kafka.pojo;
+
+import java.io.Serializable;
+
+/**
+ * @author vrajesh
+ *
+ */
+public class Greeting implements Serializable {
+
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 8693849848437534936L;
+
+	private String msg;
+	private String name;
+
+	/**
+	 * 
+	 */
+	public Greeting() {
+
+	}
+
+	/**
+	 * @param msg
+	 * @param name
+	 */
+	public Greeting(String msg, String name) {
+		this.msg = msg;
+		this.name = name;
+	}
+
+	/**
+	 * @return the msg
+	 */
+	public String getMsg() {
+		return msg;
+	}
+
+	/**
+	 * @param msg the msg to set
+	 */
+	public void setMsg(String msg) {
+		this.msg = msg;
+	}
+
+	/**
+	 * @return the name
+	 */
+	public String getName() {
+		return name;
+	}
+
+	/**
+	 * @param name the name to set
+	 */
+	public void setName(String name) {
+		this.name = name;
+	}
+
+}

src/main/java/com/springboot/kafka/producer/KafkaProducerConfig.java

+/**
+ * 
+ */
+package com.springboot.kafka.producer;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.kafka.clients.producer.ProducerConfig;
+import org.apache.kafka.common.serialization.StringSerializer;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.kafka.core.DefaultKafkaProducerFactory;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.kafka.core.ProducerFactory;
+import org.springframework.kafka.support.serializer.JsonSerializer;
+
+import com.springboot.kafka.pojo.Greeting;
+
+/**
+ * @author vrajesh
+ *
+ */
+@Configuration
+public class KafkaProducerConfig {
+	@Value(value = "${kafka.bootstrapAddress}")
+	private String bootstrapAddress;
+
+	@Bean
+	public ProducerFactory<String, String> producerFactory() {
+		Map<String, Object> configProps = new HashMap<>();
+		configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
+		configProps.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
+		configProps.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
+		return new DefaultKafkaProducerFactory<>(configProps);
+	}
+
+	@Bean
+	public KafkaTemplate<String, String> kafkaTemplate() {
+		return new KafkaTemplate<>(producerFactory());
+	}
+
+	@Bean
+	public ProducerFactory<String, Greeting> greetingProducerFactory() {
+		Map<String, Object> configProps = new HashMap<>();
+		configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
+		configProps.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
+		configProps.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, JsonSerializer.class);
+		return new DefaultKafkaProducerFactory<>(configProps);
+	}
+
+	@Bean
+	public KafkaTemplate<String, Greeting> greetingKafkaTemplate() {
+		return new KafkaTemplate<>(greetingProducerFactory());
+	}
+}

src/main/java/com/springboot/kafka/topic/KafkaTopicConfig.java

+/**
+ * 
+ */
+package com.springboot.kafka.topic;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.kafka.clients.admin.AdminClientConfig;
+import org.apache.kafka.clients.admin.NewTopic;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.kafka.core.KafkaAdmin;
+
+/**
+ * @author vrajesh
+ *
+ */
+@Configuration
+public class KafkaTopicConfig {
+	@Value(value = "${kafka.bootstrapAddress}")
+	private String bootstrapAddress;
+
+	@Value(value = "${message.topic.name}")
+	private String topicName;
+
+	@Value(value = "${partitioned.topic.name}")
+	private String partionedTopicName;
+
+	@Value(value = "${filtered.topic.name}")
+	private String filteredTopicName;
+
+	@Value(value = "${greeting.topic.name}")
+	private String greetingTopicName;
+
+	@Bean
+	public KafkaAdmin kafkaAdmin() {
+		Map<String, Object> configs = new HashMap<>();
+		configs.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
+		return new KafkaAdmin(configs);
+	}
+
+	@Bean
+	public NewTopic topic1() {
+		return new NewTopic(topicName, 1, (short) 1);
+	}
+
+	@Bean
+	public NewTopic topic2() {
+		return new NewTopic(partionedTopicName, 6, (short) 1);
+	}
+
+	@Bean
+	public NewTopic topic3() {
+		return new NewTopic(filteredTopicName, 1, (short) 1);
+	}
+
+	@Bean
+	public NewTopic topic4() {
+		return new NewTopic(greetingTopicName, 1, (short) 1);
+	}
+}

src/main/resources/application.properties

+kafka.bootstrapAddress=localhost:9092
+message.topic.name=kafkaexample
+greeting.topic.name=greeting
+filtered.topic.name=filtered
+partitioned.topic.name=partitioned
+
+##Logging
+logging.level.org.springframework.web=INFO
+logging.level.guru.springframework.controllers=DEBUG
+logging.level.org.hibernate=ERROR
+logging.file=logs/spring-boot-logging.log
\ No newline at end of file

src/test/java/com/springboot/kafka/SpringBootKafkaApplicationTests.java

+package com.springboot.kafka;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class SpringBootKafkaApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}