What is Web3j?

Small review of lightweight Java and Android library for integration with Ethereum clients
15 December 2017   1786

What is webj3?

web3j is a lightweight, highly modular, reactive, type safe Java and Android library for working with Smart Contracts and integrating with clients (nodes) on the Ethereum network:

web3j architecture
Web3j Architecture

This allows you to work with the Ethereum blockchain, without the additional overhead of having to write your own integration code for the platform.

According to the developers, these are the features:

  • Complete implementation of Ethereum's JSON-RPC client API over HTTP and IPC
  • Ethereum wallet support
  • Auto-generation of Java smart contract wrappers to create, deploy, transact with and call smart contracts from native Java code (Solidity and Truffle definition formats supported)
  • Reactive-functional API for working with filters
  • Ethereum Name Service (ENS) support
  • Support for Parity's Personal, and Geth's Personal client APIs
  • Support for Infura, so you don't have to run an Ethereum client yourself
  • Comprehensive integration tests demonstrating a number of the above scenarios
  • Command line tools
  • Android compatible
  • Support for JP Morgan's Quorum via web3j-quorum

It has five runtime dependencies:

  • RxJava for its reactive-functional API
  • OKHttp for HTTP connections
  • Jackson Core for fast JSON serialisation/deserialisation
  • Bouncy Castle (Spongy Castle on Android) for crypto
  • Jnr-unixsocket for *nix IPC (not available on Android)

It also uses JavaPoet for generating smart contract wrappers.

Lear more at GitHub.

What's new in IntelliJ IDEA 2018.2?

New version of popular IDE improved Spring and Spring Boot support
18 July 2018   78

The new version of IDE IntelliJ IDEA from JetBrains under the number 2018.2 has introduced several functions for developers using Spring and Spring Boot frameworks. Among the innovations: support for Spring Integration, runtime diagrams, library bin management and many minor fixes and improvements.

New features of IntelliJ IDEA

Now you can visualize the components in the system using the new Spring Integration diagram. All versions above 5.0 are supported.

Spring Integratio Diagram
Spring Integration Diagram

It shows all the gateways, channels and bridges of the application, regardless of whether they are configured using Java or XML annotations.

The IDE also received code completion and navigation for such integration annotations as @BridgeTo/From and @EnablePublisher:

Integration Annotations
Integration Annotations

In the new version of IntelliJ IDEA, you can view the dependencies during the execution of the Spring Boot application as a diagram through the control panel. To do this, go to the "Endpoints" section and enable the "Diagram Mode" function:

Runtime Dependencies
Runtime Dependencies

If there are too many beans in the project, the non-user codes can be disabled using the new "Show / Hide Library Beans" switch:

Show / Hide library beans
Show / Hide library beans

In addition, in 2018.2, you can start, modify, and test the display of HTTP requests in the "Endpoints" tab:

HTTP request
HTTP request

A complete list of improvements and changes is available in the technical update document. According to the developers, a lot of work has been done to improve performance in large projects.