How to contribute?

Building the SDK


The SDK heavily makes use of the lombok IDE plugin to hide glue code, especially getters, setters, builders and helper methods and helps to keep the classes clean and focus on the logic. The plugin is needed in your IDE of choice to automatically create the necessary methods in the background

git clone
git checkout dev

Development environment

The SDK is shipped with multiple preconfigured docker containers to support integration testing and debugging. In order to start them just call docker-compose:

docker-compose up -d

After pulling the images you should see the following instances up and running:

  • aeternal - local middleware that provides aggregated data and websockets

  • compiler - local aeternity node to provide the sophia compiler functions

  • node - local aeternity node to provide the protocol functions

  • proxy - a nginx httpd to expose the aeternity nodes as well as the goggles app to the running host

The services then can be accessed through the following URLs.



aeternal REST API






compiler REST API




If the the docker-machine can't be accessed through localhost (e.g. when using docker-toolbox for windows) you can set the host aelocal in your /etc/hosts file and point to the IP of your docker-machine. Of course you would need to use aelocal instead of localhost to access the services.

By default, the aeternity node starts with debug logging mode which is defined in the docker/aeternity.yaml. In order to access the node logs, use docker-compose to connect into the container using the following script

docker-compose exec node sh
cd log/
tail -100f aeternity.log

Generate API clients

In order to develop and test the SDK one need to generate the necessary Java classes for defined in the swagger endpoint definition once (and every time, the swagger definition is updated).

# if set to true the sources will be generated on each build

# if the above env-variable is missing or set to false the sources
# need to be generated manually be executing this command
gradle generateApiClient

Testing the SDK

The SDK ships with two kinds of tests

  • unit tests, which run independently of a node and prove basic functions and services

  • integration tests, which need a running aeternity node and validate posted transactions of all currently supported types

In order to run the integration tests you need to define the URLs to the local aeternity and compiler node. This is done using the following environment variables (example is provided for local environment):

## using localhost
AETERNAL_BASE_URL  = http://aeternal.localhost
AETERNITY_BASE_URL = http://localhost
COMPILER_BASE_URL  = http://compiler.localhost

## using aelocal (by editing /etc/hosts)
AETERNAL_BASE_URL  = http://aeternal.aelocal
AETERNITY_BASE_URL = http://aelocal
COMPILER_BASE_URL  = http://compiler.aelocal

## using IP
AETERNAL_BASE_URL  = http://localhost:8080
AETERNITY_BASE_URL = http://localhost
COMPILER_BASE_URL  = http://localhost:3080

The tests can be run within your IDE of choice by using the following gradle tasks

gradle test
gradle integrationTest

The task integrationTest requires the running docker-compose setup.

Contributing to the SDK

All contributions to the SDK must be linked to an issue within the aepp-sdk-java project - either pick one or create a new one if you miss a feature or want to fix / enhance current services.

The next step is to create a feature branch which must be named according to the ticket


Integrationtests should extend the BaseTest class which especially provides some convinent functions for running tests using the underlying vertx framework. Test methods can thus make use of the

executeTest(TestContext context, Consumer<?> method) 

method, assertions should be made using the vertx TestContext

public void testMyLogic(TestContext context) {
        t -> {
          <Custom Test Logic>
          context.assertTrue(result.getBalance().compareTo(ZERO) == 1);

After implementing the feature / enhancement / fix and providing an appropriate amount of tests / integration tests format your code using the google formatter pattern (if you don't already use it) by running the following gradle command. Unformated / wrong formatted as well as untested code will be rejected.

gradle googleJavaFormat

Then push your branch and create a pull request. After successful review, the PR will be merged into the dev branch and later into the master branch, from where it will be released.

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