Web3j web3j = Web3j.build(new HttpService("http://localhost:8545")); ECKeyPair keyPair = Keys.createEcKeyPair(); Credentials credentials = Credentials.create(keyPair); TransactionReceipt transactionReceipt = Transfer.sendFunds( web3j, credentials, BigDecimal.valueOf(1.0), Convert.Unit.ETHER); YourSmartContract contract = YourSmartContract.deploy( web3j, credentials, GAS_PRICE, GAS_LIMIT, <dependency> <groupId>org.web3j</groupId> <artifactId>core</artifactId> <version>4.8.0</version> </dependency>