Java 9 Collections and Performance (17/5)

Hi devs!

Our next event is just around the corner! Thanks to our friends from Oracle Netsuite we will have the opportunity to play with Java 9 on an interesting workshop! ;-)

In this session we'll take a look at the new developer features that Java 9 delivers.

In particular, we'll look at Stream API improvements and see how our code can be substantially reduced. Finally, we'll benchmark it using JMH (Java Microbenchmark Harness) to analyze the impact the enhancements have on runtime.

Beers and snacks will be provided thanks to Oracle Netsuite.

Agenda:
19:00 - 19:30 Java 9 Streams API Overview
19:30 - 20:00 Dojo
20:00 - 20:15 Beer Break
20:15 - 20:45 Microbenchmarking

Remember to bring your own laptop, RSVPed and happy coding!

Sensorize your Life Workshop (31/5)

Hi devs!

Here we have our next event, this time a workshop to play with IoT and Arduino! Yay! ;-) Thanks to our friends from Netsuite we will have a great time playing with Arduino and the IoT. Also we will have a great time with drinks and food provided by Netsuite, so one more time, thank you to their support. Below you can see below the content and purpose of the workshop.

Nothing more, remember to RSVPed and have a nice coding and see you next 31th!

PD: Meanwhile we are working on the Java and JVM Barcelona Conference ( www.jbcnconf.com ) ! In the case you don't have your ticket, hurry up and buy your ticket! This year is going to be even better ;-) !

Abstract
---

The Internet of Things is a hot topic and is set to change how we live. But how much do you really know about it? This event demystifies the subject and shows you the potential of the technology.

In this practical workshop, you will learn about the basic concepts of the Internet of Things, discover how to connect a built IoT device, and push environmental metrics to a container-based monitoring platform deployed on Oracle Cloud Services.

At this workshop, you will:

• Program a mini board using Arduino, mastering the basic controls used to trigger actions in the on-board LED
• Connect a shield to detect temperature and humidity values
• Display data on an OLED display
• Send data to a persistent data store
• Push data to the cloud: Adafruit IO and Oracle Cloud Services

Topics covered:
---

• Introduction to the Arduino IDE
• Board installation
• Introduction to Arduino sketches and Hello World
• Basic LED controls: blocking, non-blocking and fade-in/fade-out
• Environmental sensor and display control
• Temperature & humidity output display and monitoring
• Push data collected to the Adafruit IO platform and to a container-based monitoring platform deployed on Oracle Cloud Services

Prerequisites & requirements
---

No prior experience required! Participants do need to bring their own laptops.
We recommend you install Arduino IDE beforehand. You can download the version for your OS here: https://www.arduino.cc/en/Main/Software

Simon Ritter on tour! JDK 9, 10, 11 & Beyond: Delivering New Feature in the JDK (2/5)

Hi devs!

We are really happy to announce a new talk, this time by a very well known (and great) speaker: Simon Ritter. Simon will be running a tour around Spain (with more people from Azul Systems ) during the first 2 weeks of May and Azul have contacted us in case we are interested in hosting a talk by them ... and we are, of course! ;-)

We will be the first city in their tour and this is the "crazy tour" they have planned to: 2/5 Barcelona, 3/5 Castellón, 4/5 Valencia, 7/5 Malaga, 8/5 Sevilla, 9/5 Madrid, 10/5 Vigo, 11/5 Coruña

About the talk, Simon has shared with us his proposal to talk about the new features and evolutions on the JDK. Here you can see the details:

JDK 10 was released only six-months after JDK 9, demonstrating that the new fast cadence for the OpenJDK works. Even with such a short development cycle, there were still over a hundred new features covering the language, core libraries and the JVM.

In this session we’ll take a look at how the Java platform is evolving with the introduction of big features like the Java Platform Module System (JPMS) in JDK 9, local variable type inference in JDK 10 and dynamic class file constants in JDK 11. We’ll also cover many of the smaller features that will make your life as a developer easier.

What might JDK 12, 13 and 14 include? To answer that question, we’ll explore some of the longer-term plans for Java, like project Amber, Loom and Valhalla.

Many of you may know Simon Ritter, but in case not, he is the Deputy CTO of Azul Systems. He has been in the IT business since 1984 and holds a Bachelor of Science degree in Physics from Brunel University in the U.K. 

Simon joined Sun Microsystems in 1996 and started working with Java technology from JDK 1.0; he has spent time working in both Java development and consultancy. Having moved to Oracle as part of the Sun acquisition, he managed the Java Evangelism team for the core Java platform, Java for client applications and embedded Java. Now at Azul, he continues to help people understand Java as well as Azul’s JVM technologies and products. Simon has twice been awarded Java Rockstar status at JavaOne and is a Java Champion. He currently represents Azul on the JCP Executive Committee and on the Java SE Expert Group (JSR 379, 383 and 384). You can follow him on Twitter with @speakjava

Nothing more, remember to RSVPed and see you there!

Arquitectura y despliegue de aplicaciones con Openshift (19/4)

Hola JUGgers!

Volvemos a la carga con otro evento (ojo en poco tiempo tendremos varios) ;-) ¡Estad atentos!

En esta ocasión nos centraremos de la mano de GFT en la solución de RedHat para el desarrollo, despliegue y gestión de contenedores en la nube: Openshift

Openshift es una de las plataformas PaaS líderes en gestión de contenedores Docker que ofrece RedHat y la idea del evento, además de conocer por encima la arquitectura de la plataforma, es explicar la necesidad de una herramienta como esta en nuestro día a día, dónde los contenedores Docker, DevOps, Sistemas de integración continua, etc… están a la orden del día. Entraremos también un poco más en detalle para explicar cómo se suelen desplegar las aplicaciones, la mayoría de ellas microservicios, y lo más importante, basada en nuestras propias experiencias en proyectos actuales dentro de GFT.

Los ponentes en esta ocasión serán Ivan Fontanals y Jordi Sola de GFT. Ivan es un entusiasta de las nuevas tecnologías, arquitecturas y sistemas de información. Lleva más de 10 años trabajando como arquitecto de software, sobretodo en temas de J2EE, y durante los últimos 2-3 años, metido también en temas de DevOps en GFT. Jordi es un entusiasta del desarrollo, especialmente en Java. Se ha especializado en el control de calidad del código y estándares de desarrollo. Tras 8 años en GFT, ha descubierto su interés por el mundo de los contenedores y el ‘continuous release’, y ha enfocado su trabajo en la automatización de procesos en OpenShift. En su tiempo libre, participa de varios proyectos OpenSource, manteniendo librerías propias, colaborando en el desarrollo del lenguaje de programación Ceylon (https://ceylon-lang.org) y como miembro asociado de la comunidad JCP.

Agradecer una vez más a nuestros amigos de Ubiqum que nos ceden el espacio de sus oficinas para realizar la charla y también dar las gracias a GFT que nos proporcionarán algo de comer y de beber para hacernos más llevadero el networking de después de la charla ;-)

Nada más, recuerda reservar tu plaza a través de Meetup y nos vemos el próximo Jueves 19 en Ubiqum!

Microservicios con Spring Boot y Spring Cloud con Despliegue en Docker y Kubernetes (28/4)

Hi devs!

(Antes de nada, agarraos, que este mes vamos fuertes! ;-)) 

Dicho esto, vamos a por otro Hackday relacionado con Spring Boot, Spring Cloud, Docker y Kubernetes para el próximo sábado día 28. Btw, estamos abiertos a dónde realizarlo, contacta con nosotros si estáis interesados en ofrecer vuestras oficinas ;-)

Los grupos de usuarios de Java de España y Latinoamérica nos hemos unido de nuevo para compartir conocimientos. Desde Febrero del 2018 intentaremos reunirnos cada dos meses para realizar talleres sobre temas de tecnología de gran interés en nuestras comunidades (aquí o aquí podéis consultar algunas sesiones anteriores).

En esta ocasión y desde Latinoamérica, el grupo de usuarios de Perú será el encargado de orientar nuestra segunda sesión en el mes de abril del 2018: "Microservicios con Spring Boot y Spring Cloud con Despliegue en Docker y Kubernetes"

Únete a este evento y haz parte de las comunidades de habla hispana!

Si es posible, trae tu laptop o equipo portátil para que practique con nosotros, tendremos 2 horas de sesiones técnicas y ejercicios prácticos.

* Agenda

• 17:00 - 17:30 Hands on lab: Instalación y configuración, explicación de la metodología.
• 17:30 - 17:45 Presentación
• 17:45 - 18:45 Workshop
• 18:45 - 19:00 Feedback
• 19:00 - 20:00 Reunión local cada JUG

* Requisitos:

• Java 8 o superior:
• http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
• IDE: sugerimos alguno de los siguientes
• Intellij: https://www.jetbrains.com/idea/
• VsCode: https://code.visualstudio.com/
• Eclipse: https://spring.io/tools/sts/all
• Contenedores

• Docker: https://docs.docker.com/install/#supported-platforms
• Docker-compose: https://docs.docker.com/compose/install/
• Kubernetes

• Kubectl: https://kubernetes.io/docs/tasks/tools/install-kubectl/
  
• Deploy in the cloud (con 1 es suficiente, x el momento sólo WeDeploy no requiere usar tarjeta de crédito)
• SDK de Google Cloud: https://cloud.google.com/sdk/downloads?hl=es
• Azure CLI 2.0: https://docs.microsoft.com/en-us/cli/azure/install-azure-cli?view=azure-cli-latest
• We CLI: https://wedeploy.com/docs/intro/using-the-command-line/

Hacen parte de nuestra comunidad los grupos: Barcelona JUG, Cali JUG, Coruña JUG, Ecuador JUG, Guate JUG, Madrid JUG, Málaga JUG, Medellín JUG, Nicaragua JUG, Panamá JUG, Perú JUG y Vigo JUG

Esta sesión estará moderada por Perú JUG apoyada por Medellin JUG.

* Speakers
- José Díaz (@jamdiazdiaz): Es ingeniero Informático, con amplia experiencia en análisis, diseño e implementación de soluciones SOA y Micro Servicios desde hace 17 años, aplicando metodologías ágiles y buenas prácticas del PMI. Actualmente se desempena como Arquitecto de Software senior en Everis Perú destacado en el desarrollo del nuevo Home Banking para el Banco de Crédito del Perú (BCP) bajo arquitectura de Micro servicios. Jose es el fundador y dueño de JOEDAYZ.PE empresa dedicada a entrenamiento en linea y presencial de cursos de programación. Tambien es el Líder del Grupo de Usuarios de Java de Perú, grupo de usuarios de Java reconocido mundialmente por Oracle. Facilitador, Organizador y Ponente en Eventos alrededor de tecnologías Java, Java EE, Cloud Native, Micro Servicios y Serverless.

- Ytalo Elias Borja Mori (@ytachi0026 ): Ytalo es Software Engineer in Avantica, Master’s degree at UCL. Con experiencia de 8 años en proyectos en desarrollo OO con Java y JavaScript, usando buenas prácticas y patrones de software , así como trabajo en sistemas operativos basado en Unix. Actualmente trabaja para Avantica (empresa de software Costarricense) en sus oficinas de Perú para cuentas en Estados Unidos. Es responsable por el desarrollo backend en una compañía americana.

Ah! Casi nos olvidamos! Agradecer una vez más a nuestro amigos de RocketROI que nos ofrecen sus oficinas para realizar el evento y también nos invitarán a algo de beber y de picar ;-)

Nada más por ahora, recuerda de reservar tu plaza a través de Meetup y nos vemos a finales de mes!

Gambling with Leopards - Ben Evans (24/1)

Hi JUGgers !!!

Ready for our next event... next Wednesday 24th? (yes, we know without too much time in advance) but... we would like to the advantage of Ben Evan's being in our city and we've convinced him to give us a talk ;-)

This is a fairly light talk, where Ben talks about the experience of writing a full-size reference application - BetLeopard - which is an open-source implementation of an engine for betting on horse racing.

In the talk Ben will show several different ways of approaching a calculation problem - first by using Java 8 lambdas, then by using Hazelcast in-memory data grid and then with Apache Spark for processing and then again with the new Hazelcast Jet technology.

It covers processing techniques, some domain design, serialization as well as showing how to get started with Spark and Jet. It should be useful for anyone who wants to learn about different approaches in modern distributed processing.

This time we have to thank Ocado for offering us his facilities for the event and inviting us to something to eat and drink and do some networking ;-)

Have a good weekend and see you next Wednesday!

MPORTANT NOTICE

This year to prevent the no-show effect for those people that register and never come and to avoid problems to our sponsors ( buying food for not present people ) and to us ( searching for bigger rooms ), we'll charge 2 EUR to everyone registering and we will give back that amount for those that really attend the event.

Don't forget to register

Lazy Java - Mario Fusco (18/01)

Hi devs !!!

We continue this year 2018 with a great speaker Mario Fusco and a very interesting topic : lazyness ( a purpose for this new year ? ;) )

Like all imperative languages Java is, with some minor but notable exceptions, an eagerly evaluated programming language. Nevertheless the introduction of lambdas in Java 8 also allowed the adoption of some lazy patterns and data structures that are more typically employed in functional languages. Streams represent the most evident example of how also native Java API has taken advantage of laziness, but there is a number of other interesting scenarios where laziness can be an effective solution to quite common problems. In fact laziness is the only possible technique to process potentially infinite amount of data, or more in general to delay the expensive evaluation of an expression only when and if it is necessary. But laziness is even more than that: for instance the reader monad delays not only a computation but also the need of external dependencies thus lowering the abuse of dependency injection, while a trampoline uses laziness to delay and then linearize recursive calls preventing the overflow of the stack. The purpose of this talk is illustrating why and how implementing laziness in Java with practical examples delivered with both slides and live coding sessions.

Mario is a senior software engineer at Red Hat working at the development of the core of Drools, the JBoss rule engine. He has a huge experience as Java developer having been involved in (and often leading) many enterprise level projects in several industries ranging from media companies to the financial sector. Among his interests there are also functional programming and Domain Specific Languages. By leveraging these 2 passions he created the open source library lambdaj with the purposes of providing an internal Java DSL for manipulating collections and allowing a bit of functional programming in Java. He is also a Java Champion and the co-author of "Java 8 in Action" published by Manning.

Hope you can make it and we can finally meet there.

IMPORTANT NOTICE

This year to prevent the no-show effect for those people that register and never come and to avoid problems to our sponsors ( buying food for not present people ) and to us ( searching for bigger rooms ), we'll charge 2 EUR to everyone registering and we will give back that amount for those that really attend the event.

Don't forget to register

Happy coding