Fixed and updated code examples from the book "Apache Kafka"

Updated to Apache Kafka 0.8.1.1
Configuration optimized for usage on Windows machines
Windows batch scripts fixed (taken from https://github.com/HCanber/kafka by @HCanber)
Code examples repaired and refactored

Initial Setup

Download and install Apache Kafka 0.8.1.1 (I used the recommended Scala 2.9.2 binary)
Copy the scripts from /bat into /bin/windows of your Kafka installation folder (overwrite existing scripts)
Copy the property files from /config into /config of your Kafka installation folder (overwrite existing files)

Open command line in your Kafka installation folder
Launch Zookeeper with .\bin\windows\zookeeper-server-start.bat .\config\zookeeper.properties
Open a second command line in your Kafka installation folder
Launch single Kafka broker: .\bin\windows\kafka-server-start.bat .\config\server.properties
Open a third command line in your Kafka installation folder
Create a topic: .\bin\windows\kafka-topics.bat --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic test
Start a console consumer for that topic: .\bin\windows\kafka-console-consumer.bat --zookeeper localhost:2181 --topic test --from-beginning
From a fourth command line or your IDE run SimpleProducer with topic and message as arguments: java SimpleProducer test HelloKafka
The message HelloKafka should appear in the console consumer's log

Open command line in your Kafka installation folder
Launch Zookeeper with .\bin\windows\zookeeper-server-start.bat .\config\zookeeper.properties
Open a second command line in your Kafka installation folder
Launch first Kafka broker: .\bin\windows\kafka-server-start.bat .\config\server-1.properties
Open a third command line in your Kafka installation folder
Launch second Kafka broker: .\bin\windows\kafka-server-start.bat .\config\server-2.properties
Open a fourth command line in your Kafka installation folder
Create a topic: .\bin\windows\kafka-topics.bat --create --zookeeper localhost:2181 --replication-factor 2 --partitions 4 --topic kafkatest
Start a console consumer for that topic: .\bin\windows\kafka-console-consumer.bat --zookeeper localhost:2181 --topic kafkatest --from-beginning
From a fifth command line or your IDE run MultiBrokerProducer with topic as argument: java MultiBrokerProducer kafkatest
Ten messages starting with This message is for key - (...) should appear in the console consumer's log

Launch multi-broker Kafka cluster and create topic kafkatest as described in step 1-8 of Java Producer with Message Partitioning
From another command line or your IDE run SimpleHLConsumer with topic as argument: java SimpleHLConsumer kafkatest
From another command line or your IDE run MultiBrokerProducer with same topic as argument: java MultiBrokerProducer kafkatest
Ten messages starting with This message is for key - (...) should appear in the log of the SimpleHLConsumer

Launch multi-broker Kafka cluster and create topic kafkatest as described in step 1-8 of Java Producer with Message Partitioning
From another command line or your IDE run MultiThreadHLConsumer with topic and number of threads as argument: java MultiThreadHLConsumer kafkatest 4
From another command line continuously produce messages by running MultiBrokerProducer several times in a row: java MultiBrokerProducer kafkatest (Note: You must start producing messages within 10sec after starting the consumer class, otherwise the consumer will shut down)
Messages starting with Message from thread (...) should appear in the log of the MultiThreadHLConsumer spread among the four threads