A Java library for interacting with the Waves blockchain.
Supports node interaction, offline transaction signing, Matcher orders, and creating addresses and keys.
Use the codes below to add WavesJ as a dependency for your project.
<dependency>
<groupId>com.wavesplatform</groupId>
<artifactId>wavesj</artifactId>
<version>0.8</version>
</dependency>
compile group: 'com.wavesplatform', name: 'wavesj', version: '0.8'
libraryDependencies += "com.wavesplatform" % "wavesj" % "0.8"
This library's page at Maven Central
Create an account from a private key ('T' for testnet):
String seed = "health lazy lens fix dwarf salad breeze myself silly december endless rent faculty report beyond";
PrivateKeyAccount account = PrivateKeyAccount.fromSeed(seed, 0, Account.TESTNET);
byte[] publicKey = account.getPublicKey();
String address = account.getAddress();
Create a Node and learn a few things about blockchain:
Node node = new Node("https://my.waves.node/");
System.out.println("Current height is " + node.getHeight());
System.out.println("My balance is " + node.getBalance(address));
System.out.println("With 100 confirmations: " + node.getBalance(address, 100));
Send some money to a buddy:
String buddy = "3N9gDFq8tKFhBDBTQxR3zqvtpXjw5wW3syA";
String txId = node.transfer(account, buddy, 1_00000000, 100_000, "Here's for you");
Set a script on an account. Be careful with the script you pass here, as it may lock the account forever!
String setScriptTxId = node.setScript(alice, "tx.type == 13 && height > " + height, Account.TESTNET, SCRIPT_FEE);
Sign a transaction offline:
Transaction tx = Transaction.makeTransferTx(account, buddy, 1_00000000, Asset.WAVES, 100_000, Asset.WAVES, "");
System.out.println("JSON encoded data: " + tx.getJson());
System.out.println("Server endpoint to send this JSON to: " + tx.getEndpoint());
Now send it from an online machine:
node.send(tx);
Create a DEX order:
Node matcher = new Node("https://testnode2.wavesnodes.com");
String matcherKey = matcher.getMatcherKey();
String wbtcId = "Fmg13HEHJHuZYbtJq8Da8wifJENq8uBxDuWoP9pVe2Qe";
Order order = matcher.createOrder(alice, matcherKey,
new AssetPair(Asset.WAVES, wbtcId),
// buy 10 WAVES at 0.00090000 WBTC each
Order.Type.BUY, 90_000, 10 * Asset.TOKEN,
// make order valid for 1 hour
System.currentTimeMillis() + 3_600_000, MATCHER_FEE);
System.out.printf("Filed order " + order.id);
There are some examples under src/examples/java.
To build from scratch, run
mvn clean package
The outputs are placed under the target directory.
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