Web3j Documentation - https://docs.web3j.io/
Web3j Source Code - https://github.com/hyperledger/web3j
Web3 Labs - https://www.web3labs.com/web3j-sdk
Hyperledger Web3j is an acclaimed open-source project, boasting over 2 million downloads, 5,000 GitHub stars, 190 unique contributors, 1,600 forks, and 111 releases.
It was created in 2016, by Web3 Labs founder and is maintained by the Web3 Labs team, who donated it to the Hyperledger Foundation at the start of 2024 to further build awareness of the project and widen the potential contributor base beyond just the Web3 Labs team.
As a JVM library designed for interacting with Ethereum L1 clients, Web3j has recently achieved a significant milestone by becoming the first web3 library to support EIP-4844. This addition enables the capability to send blob transactions, benefiting both L1 and L2 users by substantially reducing storage costs on the L1 layer.
Building on this momentum, we aim to enhance Web3j's capabilities to interact seamlessly with L2 client nodes, such as Arbitrum, Optimism, and Polygon-zkEVM, starting with Arbitrum and gradually extending support to other networks.