LFDT-web3j/web3j

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

5391 stars · 1770 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Web3j is a lightweight, modular, reactive, type-safe Java and Android library for integrating with Ethereum clients and working with smart contracts. It provides a complete JSON-RPC client implementation, Java smart contract wrapper generation from Solidity, wallet support, and a bundled CLI.

Use cases

• connect a Java application to an Ethereum node
• generate Java wrappers for Solidity smart contracts
• send transactions and deploy contracts from Android
• interact with Ethereum via Infura or Alchemy without running a node
• listen to blockchain events reactively with filters
• manage Ethereum wallets in Java
• resolve Ethereum Name Service names from JVM code

When to choose

• you are building a JVM or Android application that needs Ethereum blockchain integration
• you want type-safe smart contract bindings generated from Solidity
• you prefer a reactive API for blockchain event streams
• you need a mature, widely adopted Java web3 library

When to avoid

• you are building in JavaScript, Python, or another non-JVM language
• you need support for non-EVM blockchains like Solana or Bitcoin
• you want a full dapp frontend framework rather than a client library

Facets

library · maturity active

http-client rpc cli sdk serialization blockchain fintech developer-tools mobile-development jvm cli ethereum web3 smart-contracts solidity json-rpc reactive wallet ens cryptocurrency android

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