How to run Java EE in the cloud?

Three skilled Java coders talks about running Java EE in the cloud
17 October 2017   545

This session is a fast-paced tour of the many options available for running Java EE applications in the cloud. It covers bare metal IaaS options such as AWS; PaaS options that provide native support for Java EE, such as Oracle Java Cloud Service/BlueMix; and everything in between. It also discusses how to deploy Dockerized Java EE applications to options such as Jelastic as well as running Java EE applications by using fat-jar solutions such as WildFly Swarm on bare JVM-based platforms such as Heroku. The presentation includes plenty of code examples and demos along the way.

Speakers are:

  • Rodrigo Bortoloto, Sr. Manager, CapTech Consulting
  • Ryan Cuprak, Analyst, Dassault Systemes
  • Reza Rahman, Consultant, Independent

What is Web3j?

Small review of lightweight Java and Android library for integration with Ethereum clients
15 December 2017   827

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.