Java 9 preview

The Virtual Java Users Group discuss the future release of Java 9 and Java 8 EE
14 August 2017   575

Java 9 will be released very shortly, and in this video JUG participants from around the world discuss the details of upcoming release. You can learn about some of the Java 9 new features, integration information, along with tips and tricks. Presenters include Simon Maple, Robert Scholte and Josh Juneau. 

Java EE 8 is close to release too, so, there will be short info about this version too. You are able to view the examples which will help you to start using new Java EE 8 features quickly.

So, what's in this video?

  •  High level overview of the Java 9 release
  • "The Pragmatic Developer’s Guide to Java 9” by Simon Maple and Oleg Shelajev 
  • "Java 9 performance" by Jonathan Ross
  • "Java 9 and the impact on Maven projects” by Robert Scholte"
  • Discussion panel, Q&A, Top Java 9 features

What is vJUG? 

vJUG is the first online Java Users Group. It allows for anyone from everywhere in the world to join and discuss all Java related topics. 

What is Web3j?

Small review of lightweight Java and Android library for integration with Ethereum clients
15 December 2017   838

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.