The following instructions guide you through the process of setting up a development environment for the purpose of developing, debugging, and executing solutions to the Flink developer training exercises and examples.

1. Software requirements

Flink supports Linux, OS X, and Windows as development environments for Flink programs and local execution. The following software is required for a Flink development setup and should be installed on your system:

  • a JDK for Java 8 or Java 11 (a JRE is not sufficient; other versions of Java are not supported)
  • Apache Maven 3.x
  • Git
  • an IDE for Java (and/or Scala) development. We recommend IntelliJ, but Eclipse or Visual Studio Code can also be used so long as you stick to Java. For Scala you will need to use IntelliJ (and its Scala plugin).

Note for Windows users: Many of the examples of shell commands provided in the training instructions are for UNIX systems. To make things easier, you may find it worthwhile to setup cygwin or WSL, but you can use the provided .bat scripts with plain cmd. For developing Flink jobs, Windows works reasonably well: you can run a Flink cluster on a single machine, submit jobs, run the webUI, and execute jobs in the IDE.

The flink-training-exercises project contains exercises, tests, and reference solutions for the programming exercises, as well as an extensive collection of examples. Clone the flink-training-exercises project from Github and build it.

For Java, use the java branch:

git clone --branch java
cd flink-training-exercises
mvn clean package

For Scala, use the master branch:

git clone
cd flink-training-exercises
mvn clean package

If you haven’t done this before, at this point you’ll end up downloading all of the dependencies for this Flink training exercises project. This usually takes a few minutes, depending on the speed of your internet connection.

If all of the tests pass and the build is successful, you are off to a good start.

If you are in China, we recommend configuring maven to use a mirror. This is done by adding some configuration to your maven settings file (in ~/.m2/settings.xml). If you don't already have any customized maven settings, you can use this:

       <name>Nexus aliyun</name>

The project needs to be imported as a maven project into your IDE.

Once that’s done you should be able to open com.ververica.flinktraining.exercises.datastream_java.basics.RideCleansingTest and successfully run this test.

Note for Scala users: For Scala you will need to use IntelliJ with the JetBrains Scala plugin, and you will need to add a Scala 2.12 SDK to the Global Libraries section of the Project Structure.

4. Download the data sets

You will also need to download the taxi data files used in this training by running the following commands


It doesn’t matter if you use wget or something else (like curl, or Chrome) to download these files, but however you get the data, do not decompress or rename the .gz files. Some browsers will do the wrong thing by default.

Note: There are hardwired paths to these data files in the exercises, in com.ververica.flinktraining.exercises.datastream_java.utils.ExerciseBase. The tests don’t use these data files, but before running the exercises, you will need to fix these paths to point to the files you have downloaded.