Initial commit

.idea/gradle.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="distributionType" value="DEFAULT_WRAPPED" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+          </set>
+        </option>
+        <option name="useAutoImport" value="true" />
+        <option name="useQualifiedModuleNames" value="true" />
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>
\ No newline at end of file

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file

.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file

build.gradle

+plugins {
+    id 'java'
+}
+
+group 'com.nisum.kafkajava'
+version '1.0-SNAPSHOT'
+
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compile group: 'org.apache.kafka', name: 'kafka-clients', version: '2.4.0'
+    compile group: 'org.slf4j', name: 'slf4j-simple', version: '1.7.30'
+    compile group: 'com.fasterxml.jackson.jaxrs', name: 'jackson-jaxrs-json-provider', version: '2.10.1'
+    compile group: 'com.fasterxml.jackson.dataformat', name: 'jackson-dataformat-csv', version: '2.10.1'
+    compile group: 'org.projectlombok', name: 'lombok', version: '1.18.10'
+
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+}

gradle/wrapper/gradle-wrapper.properties

+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.3-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  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 "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+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, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$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`="\"$arg\""
+        fi
+        i=$((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"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"

gradlew.bat

+@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 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=
+
+@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

settings.gradle

+rootProject.name = 'kafka-java'
+

src/main/java/com/nisum/kafka/tutorial1/ConsumerDemo.java

+package com.nisum.kafka.tutorial1;
+
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.common.serialization.StringDeserializer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.time.Duration;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Properties;
+
+public class ConsumerDemo {
+
+    public static void main(String[] args) {
+        Logger logger = LoggerFactory.getLogger(ConsumerDemo.class);
+        Properties properties = new Properties();
+        properties.setProperty(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"127.0.0.1:9092");
+        properties.setProperty(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
+        properties.setProperty(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class.getName());
+        properties.setProperty(ConsumerConfig.GROUP_ID_CONFIG, "my-third-application");
+        properties.setProperty(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG,"earliest");
+
+        //create consumer
+        KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<>(properties);
+        //subscribe the consumer to our topic
+        kafkaConsumer.subscribe(Collections.singleton("first_topic"));
+        //poll for new data
+        while(true){
+            ConsumerRecords<String,String> records = kafkaConsumer.poll(Duration.ofMillis(100));
+            records.forEach(t->{
+                logger.info("Key: " + t.key() + "Value: "+t.value());
+                logger.info("Partition: " + t.partition() + "Offset: "+t.offset());
+            });
+        }
+    }
+}

src/main/java/com/nisum/kafka/tutorial1/ConsumerDemoGroups.java

+package com.nisum.kafka.tutorial1;
+
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.common.serialization.StringDeserializer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.time.Duration;
+import java.util.Collections;
+import java.util.Properties;
+
+public class ConsumerDemoGroups {
+
+    public static void main(String[] args) {
+        Logger logger = LoggerFactory.getLogger(ConsumerDemoGroups.class);
+        Properties properties = new Properties();
+        properties.setProperty(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"127.0.0.1:9092");
+        properties.setProperty(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
+        properties.setProperty(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class.getName());
+        properties.setProperty(ConsumerConfig.GROUP_ID_CONFIG, "my-third-application");
+        properties.setProperty(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG,"earliest");
+
+        //create consumer
+        KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<>(properties);
+        //subscribe the consumer to our topic
+        kafkaConsumer.subscribe(Collections.singleton("first_topic"));
+        //poll for new data
+        while(true){
+            ConsumerRecords<String,String> records = kafkaConsumer.poll(Duration.ofMillis(100));
+            records.forEach(t->{
+                logger.info("Key: " + t.key() + "Value: "+t.value());
+                logger.info("Partition: " + t.partition() + "Offset: "+t.offset());
+            });
+        }
+    }
+}

src/main/java/com/nisum/kafka/tutorial1/ConsumerDemoWithThreads.java

+package com.nisum.kafka.tutorial1;
+
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.common.serialization.StringDeserializer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.time.Duration;
+import java.util.Collections;
+import java.util.Properties;
+import java.util.concurrent.CountDownLatch;
+
+public class ConsumerDemoWithThreads {
+
+    public static void main(String[] args) {
+        ConsumerDemoWithThreads.run();
+    }
+
+    private ConsumerDemoWithThreads() {
+
+    }
+
+    private static void run() {
+        String bootstrapServers = "127.0.0.1:9092";
+        String groupId = "my-fifth-application";
+        String topic = "first_topic";
+
+        //latch for dealing with multiple threads
+        CountDownLatch latch = new CountDownLatch(1);
+
+        //Creating the consumer runnable
+        Logger logger = LoggerFactory.getLogger(ConsumerDemoWithThreads.class);
+        logger.info("Creating the consumer thread");
+        Runnable myConsumerThread = new ConsumerThread(bootstrapServers, groupId, topic, latch);
+
+        //start the thread
+        Thread myThread = new Thread(myConsumerThread);
+        myThread.start();
+
+        //add a shutdown hook
+
+        Runtime.getRuntime().addShutdownHook(new Thread(() -> {
+            logger.info("Caught shutdown hook");
+            ((ConsumerThread) myConsumerThread).shutdown();
+            try {
+                latch.await();
+            } catch (InterruptedException e) {
+                logger.error("Application is interrupted ", e);
+            }
+            logger.info("Application has exited");
+        }));
+
+
+        try {
+            latch.await();
+        } catch (InterruptedException e) {
+            logger.error("Application is interrupted ", e);
+        } finally {
+            logger.info("Application is closing");
+        }
+    }
+}

src/main/java/com/nisum/kafka/tutorial1/ConsumerThread.java

+package com.nisum.kafka.tutorial1;
+
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.common.errors.WakeupException;
+import org.apache.kafka.common.serialization.StringDeserializer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.time.Duration;
+import java.util.Collections;
+import java.util.Properties;
+import java.util.concurrent.CountDownLatch;
+
+public class ConsumerThread implements Runnable {
+
+    private CountDownLatch latch;
+    private KafkaConsumer<String, String> kafkaConsumer;
+    private Logger logger = LoggerFactory.getLogger(ConsumerThread.class.getName());
+
+    public ConsumerThread(String bootstrapServers,
+                          String groupId,
+                          String topic,
+                          CountDownLatch latch) {
+        this.latch = latch;
+        Properties properties = new Properties();
+        properties.setProperty(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
+        properties.setProperty(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
+        properties.setProperty(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
+        properties.setProperty(ConsumerConfig.GROUP_ID_CONFIG, groupId);
+        properties.setProperty(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
+
+        //create consumer
+        kafkaConsumer = new KafkaConsumer<>(properties);
+        //subscribe the consumer to our topic
+        kafkaConsumer.subscribe(Collections.singleton(topic));
+
+    }
+
+    @Override
+    public void run() {
+        //poll for new data
+        try {
+            while (true) {
+                ConsumerRecords<String, String> records = kafkaConsumer.poll(Duration.ofMillis(100));
+                records.forEach(t -> {
+                    logger.info("Key: " + t.key() + "Value: " + t.value());
+                    logger.info("Partition: " + t.partition() + "Offset: " + t.offset());
+                });
+            }
+        } catch (WakeupException e) {
+            logger.info("Recieved shutdown signal!");
+        } finally {
+            kafkaConsumer.close();
+            //tell our main code when we are done with the consumer
+            latch.countDown();
+        }
+    }
+
+    public void shutdown() {
+        //the wakeup() method  is a special method to interrupt consumer.poll()
+        //It will throw the exception called wakeupException
+        kafkaConsumer.wakeup();
+    }
+}

src/main/java/com/nisum/kafka/tutorial1/ProducerDemo.java

+package com.nisum.kafka.tutorial1;
+
+import org.apache.kafka.clients.producer.KafkaProducer;
+import org.apache.kafka.clients.producer.ProducerConfig;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.apache.kafka.common.serialization.StringSerializer;
+
+import java.util.Properties;
+
+public class ProducerDemo {
+
+    private static final String bootstarpServers = "127.0.0.1:9092";
+
+    public static void main(String[] args) {
+        //create producer properties
+        Properties properties = new Properties();
+        properties.setProperty(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstarpServers);
+        properties.setProperty(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
+        properties.setProperty(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
+        //create the producer
+        KafkaProducer<String, String> producer = new KafkaProducer<String, String>(properties);
+        //create producer record
+        ProducerRecord<String, String> record = new ProducerRecord<>("first_topic", "hello world");
+        //send data
+        producer.send(record);
+        //flush data
+        producer.flush();
+        //flush and close producer
+        producer.close();
+    }
+}
+

src/main/java/com/nisum/kafka/tutorial1/ProducerWithCallback.java

+package com.nisum.kafka.tutorial1;
+
+import org.apache.kafka.clients.producer.*;
+import org.apache.kafka.common.serialization.StringSerializer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Objects;
+import java.util.Properties;
+import java.util.concurrent.ExecutionException;
+
+public class ProducerWithCallback {
+
+    private static final String bootstarpServers = "127.0.0.1:9092";
+
+    public static void main(String[] args) throws ExecutionException, InterruptedException {
+        Logger log = LoggerFactory.getLogger(ProducerWithCallback.class);
+        //create producer properties
+        Properties properties = new Properties();
+        properties.setProperty(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstarpServers);
+        properties.setProperty(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
+        properties.setProperty(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
+        //create the producer
+        KafkaProducer<String, String> producer = new KafkaProducer<String, String>(properties);
+        //create producer record
+        for(int i = 0 ; i <= 10 ; i++) {
+            String topic = "third_topic";
+            String value = "hello world " + i;
+            String key = "id_" + i;
+            ProducerRecord<String, String> record = new ProducerRecord<>("third_topic", key, "hello world " + i);
+            log.info("Key: " + key);
+            //send data
+            producer.send(record, new Callback() {
+                @Override
+                public void onCompletion(RecordMetadata metadata, Exception exception) {
+                    //excuetes every time  a record  is successfully  sent or an exception is thrown
+                    if (Objects.isNull(exception)) {
+                        // if the record is successfully sent
+                        log.info("Received new metadata. \n" +
+                                "Topic: " + metadata.topic() + "\n" +
+                                "Partition: " + metadata.partition() + "\n" +
+                                "Offset: " + metadata.offset() + "\n" +
+                                "Timestamp: " + metadata.timestamp() + "\n");
+                    } else {
+                        log.error("Error while producing: " + exception);
+                    }
+                }
+            }).get();//block the .send() to make it synchronous  - don't use it in prod
+        }
+        //flush data
+        producer.flush();
+        //flush and close producer
+        producer.close();
+    }
+}