Spring Boot and web3j: Easy Microservices for Ethereum Blockchain

DZone 's Guide to

Spring Boot and web3j: Easy Microservices for Ethereum Blockchain

web3j seamlessly integrates with Spring Frameworks. Simply create a new Spring Boot app, add the starter to your configuration, and create a service with web3j.

· Integration Zone ·
Free Resource

web3j now seamlessly integrates with the Spring Framework thanks to the web3j Spring Boot Starter.

Using Spring Boot, it's trivial to create production-ready services using web3j to work with the Ethereum blockchain.

Start by creating a new Spring Boot application. Then add the web3j-spring-boot-starter to your Gradle or Maven configuration:

dependencies {
    compile 'org.web3j:web3j-spring-boot-starter:1.0.0'

Now, create a service using web3j, and Spring will create and configure the web3j instance for you!

public class Web3jSampleService {
    private Web3j web3j;
    public String getClientVersion() throws IOException {
        Web3ClientVersion web3ClientVersion = web3j.web3ClientVersion().send();
        return web3ClientVersion.getWeb3ClientVersion();

The default HTTP endpoint of your Ethereum client is used (http://localhost:8545). However, you can easily change this in your application properties file.

# An infura endpoint
web3j.client-address = https://morden.infura.io/<your token id>
# Or, an IPC endpoing
web3j.client-address = /path/to/file.ipc

Code for this example is available here. For further information on it, check out the web3j project home page and the spring-boot-starter project.

ethereum ,integration ,web3j ,microservices ,blockchain ,tutorial ,spring

Published at DZone with permission of

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}