Author Archives: Jeanne Boyarsky

[2022 javaone] hands on lab project loom

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Facilitated by Oracle (Nicolai/Jose)

For more see the table of contents

Overview

  • The lab uses Oracle’s cloud environment. Setup was clear and well documented.
  • It’s a throwaway env only good for a few hours so you don’t have to worry about cleanup.
  • Can also do locally if prefer

Links

  • Workshop: https://bit.ly/ocw22-hol3733
  • https://github.com/JosePaumard/2022_javaone-loom-livelab.git

Virtual Threads

  • A virtual thread runs on a “real” platform thread called a carrier thread
  • Can be mounted/dismounted from carrier thread when blocks
  • It’s cool seeing a platform thread run so many virtual threads

Structured Concurrency

  • I just skimmed this part (had ice cream and got distracted talking to people so didn’t do the code for this half.) Conveniently, it is in github and I can do it in the future. Probably when it makes it out of incubator so I don’t forget everything.

My take

It took almost half an hour to get started. The online editor doesn’t work in Mac Safari so did the setup twice. I could have used Java 19 locally, but wanted to see what the lab environment looked like. I had enough time though so it was ok.’

I got to use single file source code execution (the lab didn’t say to, but less typing.) Must tease someone about its usefulness. And I got to to try out Loom.

[2022 javaone] foundations of modern java server apps

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Speaker: Kito Mann

For more see the table of contents

Notes

  • In cloud, have both microservices and traditional web apps

Microservice

  • Container (ex: docker) including UNIX kernel
  • Executable Jar or Native Image (ex: Graal)
  • Example microservice framework – Http Server, Http Java Integration, REST processing, JSON serialization, JSON parsing, validation, security, database integration, dependency injection, messaging, mail, health checks, tracing, fault tolerance, metrics, config, OpenAPI docs, GraphQL
  • Microservice frameworks – Spring boot, quarkus, micronaut, open liberty

Spring Boot

  • Http Server – Jetty, Tomcat or Underflow
  • Http Java Integration – Jakarta Servlet
  • REST processing – Jakarta RESTful Web Services or Spring MVC
  • JSON serialization – Gson, Jackson or JSON Binding
  • JSON parsing – Gson, Jackson or JSON Parsing
  • validation – Jakarta Bean validation
  • security – Spring security
  • database integration – JPA and others
  • dependency injection – Spring framework
  • messaging – Jakarta messaging, kafka and others
  • mail – spring java mail sender or jarkarta mail
  • health checks – spring boot actuator
  • tracing – spring cloud sleuth
  • fault tolerance – spring cloud circuit breaker and spring cloud netflix
  • metrics – micrometer
  • config – spring boot config
  • OpenAPI docs – Spring REST data
  • GraphQL – Spring for GraphQL

Others

Did same for Quarkus, Payara Micro, Jarkarta EE. Didn’t transcribe deck

A lot of delegating to Jakarta and MicroProfile projects

MicroProfile

  • Started in 2016

Jakarta projects

  • Jakarta Interceptors – standard way of writing interceptors
  • Platform – Jakarta enterprise beans, authorization, batch, connectors, mail, activation, messaging, web profile, core profile
  • Optional (not fully supported) – Jakarta enterprise web services, xml binding, SOAP with attachments, XML web services
  • Web profile – servlet, bean validator, persistence, authentication, web socket, CDI, mail, security, transactions, expression language, managed beans, concurrency, faces, standard tag libraries, server pages, enterprise beans light
  • Core profile – interceptor, dependency injection, annotations
  • Required for MicroProfile – Jakarta RESTful web services, JSON processing, JSON binding, CDI light
  • CDI surpassing EJB
  • New: Jakarta RPC, NoSQL, data
  • Removed: Jakarta Management

Java EE Server

  • War
  • Jakarta Servlet, RESTful web services, JSON binding/parsing, bean validation, security, persistence, CDI, messaging, mail

My take

Wow. A lot has changed since I last worked on a web app. Learned a lot here although the talk was longer than my attention span; especially later in the day. It was a bit of an info dump but good for getting the lay of the land. And I need to do a lot of reading!

[2022 javaone] new java features simplified design patterns

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Speakers: Miroslav Wegner and Benedikt Neumayr

For more see the table of contents

Byte code optimization

  • Inlining
  • Elimination
  • Scalarization

Design patterns

  • SOLID
  • DRY don’t repeat yourself
  • Separation of concerns
  • CAP – two of three (consistency, availability, partition tolderance)

Creating objects

  • Factory vs Builder
  • Example of using a builder with a sealed class
  • Factory: List.of(…)
  • Switch expression to determine what to create in factory

Organizing code

  • Organize code around instantiated objects: Adapter, Flyweight
  • Spiterator is an adapter
  • IntegerCache is Flyweight

Enforcin behavior at runtime

  • Chain of responsibility, command, caching
  • Logger is chain of responsibility
  • Runnable and Callable are command

Concurrency

  • Thread pool pattern
  • Executors

My take

I liked the one line ”safe harbor” statement that anything could change. Nice link between patterns we’ve known forever and new (and old) classes. There was a good crowd. I wish they had a room vs being on the floor of the exhibit hall. I also wish it was longer (vs a 20 min session)