gminney/thoughtj

Dash Java Library (X11, DGW, LLMQ, InstantSend, Chainlocks)

dashj

A Java library for working with Dash

Branch	Tests	Coverage	Linting
master			N/A

Welcome to dashj

The dashj library is a Java implementation of the Dash protocol, which allows it to maintain a wallet and send/receive transactions without needing a local copy of Dash Core. It comes with full documentation and some example apps showing how to use it.

This branch is up to date with bitcoinj (https://github.com/bitcoinj/bitcoinj) 0.15.10.

Technologies

• Java 8+ (needs Java 8 API or Android 6.0 API, compiles to Java 8 bytecode) and Gradle 4.4+ for the core module
• Java 8+ and Gradle 5.6 for tools and examples
• Java 11+ and Gradle 5.6 for the JavaFX-based wallettemplate
• Gradle - for building the project
• Google Protocol Buffers - for use with serialization and hardware communications

Getting started

To get started, it is best to have the latest JDK and Maven installed. The HEAD of the master branch contains the latest development code and various production releases are provided on feature branches.

Building from the command line

Official builds are currently using JDK 8. Our GitHub Actions build and test with JDK 8 and JDK 11.

To initialize the repo after cloning it (this will build the bls shared library):

git submodule update  --init --recursive
cd contrib/dashj-bls
mvn package -DskipTests
cd ../..

To use the optional x11 native library:

cd contrib/x11
mkdir build
cd build
cmake ..
cmake --build .
cd ../../..

To perform a full build use (this includes the dashjbls shared library):

To perform a full build (including JavaDocs and unit/integration tests) use JDK 11+.

./gradlew clean build

If you are using Gradle 4.10 or later, the build will automatically include the JavaFX-based wallettemplate module. The outputs are under the build directory.

To perform a full build without unit/integration tests use:

./gradlew clean build -x test

To perform a full build and install it in the local maven repository:

./gradlew assemble

to generate a website with useful information like JavaDocs.

The outputs are under the target directory.

Deployment

To deploy to the maven repository:

./gradlew publish

Building from an IDE

Alternatively, just import the project using your IDE. IntelliJ has Gradle integration built-in and has a free Community Edition. Simply use File | New | Project from Existing Sources and locate the build.gradle in the root of the cloned project source tree.

The dashjbls library must still using the instructions above.

Example applications

These are found in the examples module.

Where next?

Now you are ready to follow the tutorial. Though this is for bitcoinj, there is no equivalent site for dashj.

Building and Using the Wallet Tool

The dashj tools subproject includes a command-line Wallet Tool (wallet-tool) that can be used to create and manage dashj-based wallets (both the HD keychain and SPV blockchain state.) Using wallet-tool on Dash's test net is a great way to learn about Dash and dashj.

To build an executable shell script that runs the command-line Wallet Tool, use:

gradle dashj-tools:installDist

You can now run the wallet-tool without parameters to get help on its operation:

./tools/build/install/wallet-tool/bin/wallet-tool

To create a test net wallet file in ~/dashj/dashj-test.wallet, you would use:

mkdir ~/dashj

./tools/build/install/wallet-tool/bin/wallet-tool --net=TEST --wallet=$HOME/dashj/dashj-test.wallet create

To sync the newly created wallet in ~/dashj/dashj-test.wallet with the test net, you would use:

./tools/build/install/wallet-tool/bin/wallet-tool --net=TEST --wallet=$HOME/dashj/dashj-test.wallet sync

To dump the state of the wallet in ~/dashj/dashj-test.wallet with the test net, you would use:

./tools/build/install/wallet-tool/bin/wallet-tool --net=TEST --wallet=$HOME/dashj/dashj-test.wallet dump

Note: These instructions are for macOS/Linux, for Windows use the tools/build/install/wallet-tool/bin/wallet-tool.bat batch file with the equivalent Windows command-line commands and options.

Example applications

These are found in the examples module.

Where next?

Now you are ready to follow the tutorial.

Testing a SNAPSHOT build

Building apps with official releases of dashj is covered in the tutorial.