Integrating the Ethereum Blockchain into Java Apps

February 28, 2017 | 1 minute read
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How to access a distributed ledger technology blockchain from a Java application using web3j. The Ethereum blockchain is a decentralized platform that is the backbone of a secure, decentralized internet and is driven by the eponymous cryptocurrency Ether. Conor Svensson authored web3j, a lightweight Java library for building Java applications on the Ethereum blockchain. 

In a first article, which appeared in the Java Magazine, Conor Svensson gives the background of the Ethereum blockchain technology and explains how to create a blockchain that is connected to a Java application.  Web3j, a wrapper of client remote procedure calls using JSON, manages the transaction interactions with Ethereum clients. 

In a second article, he details how to use web3j to query the Ethereum blockchain via its reactive-functional API. He explains how to use RxJava’s Observables to add reactive functionality to the blockchain. 

An Ethereum client like Geth or Parity is the first step to getting you started. Clients will synchronize the Ethereum blockchain with one another and provide a gateway to interact with the blockchain. Ethereum takes care of Ether cryptocurrency payment transactions via the network. With just a few lines of code, you can hook up to the Ethereum blockchain and be notified of new blocks being added to the blockchain and start pulling information out of the blockchain in real time.

For code and step by step examples, read the full article here 

for more information, please visit: web3j project and Conor's blog 

Yolande Poirier

Yolande Poirier manages the online experience for the world's biggest IT community. She empowers developers to successfully grow their projects, businesses, and careers. Telling the story of how people use technology, she curates technical content, interviews IT professionals around the world, and write blogs about Java technologies and projects. She is a speaker at international conferences and JavaOne Rock Star, this year's track lead of the developer community day and a long time member of @jduchess, a network of women in Java. She manages @Java, a network of over 350,000 developer enthusiasts.

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