Raible Designs

Devoxx France 2016: Springtime in Paris

I had the good fortune to visit Paris last week for Devoxx France. When traveling to conferences in exotic locations, I like to bring a travel partner. This time, I asked my daughter, Abbie, to join me. She gladly accepted. Springtime in Paris can be a beautiful event. The grass is green, the flowers are blooming and the sun's rays blanket the city.

We arrived in Paris on Tuesday, April 19 and quickly found our way to our hotel. Its location was ideal: across the street from Le Palais des Congrès de Paris convention center and mall. Since the conference was at the convention center, it made logistics for my talks very convenient. We grabbed a quick bite after settling in, then took a 15-minute stroll to the Arc de Triomphe.

That evening, we joined Ippon developers and friends at a special event for Java Hipsters. Their rooftop location had great views, cold "Java" beer and I met a lot of enthusiastic developers. I especially enjoyed talking with the original Java Hipster and founder of JHipster, Julien Dubois.

The sunset over Paris provided a splendid backdrop for the festivities.

Devoxx 2015: A Java Hipster Visits Belgium

I've been excited to show people JHipster and what it can do ever since I started using it in September 2014. I've been using its core frameworks (AngularJS, Bootstrap and Spring Boot) for a few years and believe they do a great job to simplify web development. Especially for Java developers.

When my JHipster talk was accepted for Devoxx Belgium, I told Trish we were headed back to Belgium. She smiled from ear-to-ear. Belgium is one of our favorite countries to visit. In an effort to live healthier prior to Devoxx, I stopped drinking beer a month beforehand. I mentioned this to friends the week prior.

One month ago, I stopped drinking beer. I hoped it'd help me with www.21-points.com and weight loss. Unfortunately, it did not.

I told myself I'd start drinking beer again when 1) The Bus was finished or 2) Trish and I arrived in Belgium for Devoxx. Looks like #2 will win (we land on Tuesday).

We arrived in Brussels late Tuesday morning and hopped aboard a train to Antwerp. After arriving, we were hungry so we stopped at Bier Central for lunch. The mussels and beer were splendid.

Google's Mirror of Maven Central 25% Faster

Last week, Takari announced that Google is Maven Central's New Best Friend. While writing a news article about this for InfoQ, I decided to run a small test to see the speed of the default Maven Central versus the new Google Cloud Storage instance. This micro benchmark didn't seem worthy of including in the article, but I think it's interesting to see the speed improvements I found.

I ran rm -rf ~/.m2/repository, then mvn install with the default repository configured. I ran the commands again with Google Cloud Storage. I found that the downloading of dependencies, compilation and running unit tests on AppFuse's web projects averaged 4 minutes, 30 seconds. With Google Cloud Storage, the same process averaged 3 minutes and 37 seconds. By my calculations, this means you speed up artifact resolution for your Maven projects by 25% by switching to Google. To do that, create a ~/.m2/settings.xml file with the following contents.

<settings>
  <mirrors>
    <mirror>
      <id>google-maven-central</id>
      <name>Google Maven Central</name>
      <url>https://maven-central.storage.googleapis.com</url>
      <mirrorOf>central</mirrorOf>
    </mirror>
  </mirrors>
</settings>

Benchmark Details
My tests were run on a Mac Pro (late 2013) with a 3.5 GHz 6-Core Intel Xeon E5 processor and 32 GB of RAM. Bandwidth speeds during this test averaged 57 Mbps down, 6 Mbps up. Below are the timing numbers (in minutes) from my test:

Default: 4:33, 4:36, 4:32, 4:24, 4:09
Google: 5:13, 3:35, 2:15, 3:38, 3:39

Google had some wide variances in its results, with five minutes and two minutes. Because of this, I dropped the low and high numbers for each service before calculating the average. My math with raw numbers is below.

Default:
273, 276, 272, 264, 213 = 260, 4:20
276, 272, 264 = 270, 4:30

Google:
313, 215, 135, 218, 219 = 220, 3.66 = 3:40
215, 218, 219 = 3:37

Chen Eric commented on the InfoQ article to note that Chinese programmers are blocked from using Google.

Update: Jason Swank of Sonatype has done some more extensive benchmarking and found different results.

We found that average unprimed Google API (first mvn run) caching performed 30% slower than Maven Central. Primed Google API cache performance (second run) was 3% faster then Maven Central (second run). We also ran a number of cloud-based tests with similar results.

The JHipster Mini-Book: How We Did It and What's Next

Last Friday, the JHipster Mini-Book was published on InfoQ. I wrote about this milestone on the book's blog. I'm pumped to see this release happen, and I'd like to give you a behind-the-scenes peak at how it went from idea to production.

The Idea
At the end of last year, I wrote down my goals for 2015:

• 21 Point Fitness App
• JHipster Mini Book (InfoQ)
• Finish Bus
• New House
• Good Blood Pressure

My reason for wanting to write a JHipster Mini-Book was simple: I knew AngularJS, Bootstrap and Spring Boot quite well. I'd used them on several projects and I really liked how JHipster married them all together. I often ran into people that used these technologies, but hadn't heard of JHipster. I was hoping to make more people aware of the project and market my development skills at the same time.

SpringOne 2GX 2015: My Presentations on Comparing Hot JavaScript Frameworks and NoXML

Last week, I had the pleasure of traveling to Washington, DC to speak at the annual SpringOne 2GX conference. I was pretty stressed for the last few weeks because I had to create two new presentations from scratch, and both had to be 90 minutes long. I was also hoping to finish the JHipster Book before the conference started. I was able to finish both presentations in the nick of time, but did not find the time to write the last chapter in the JHipster Book.

The first presentation was titled Comparing Hot JavaScript Frameworks: AngularJS, Ember.js and React.js. I started by revisiting the Comparing JVM Web Frameworks talk I did at vJUG last February. I explained how I think traditional web frameworks are no longer relevant in 2015, but I do believe server-side rendering is still very relevant. From there, I used Yevgeniy Brikman’s framework scorecard (from his Node.js vs. Play Framework presentation) to rank each framework by a number of different criteria. You can see the final results on slide 160. Since the scores were so close, I believe you could tweak some scores a bit (or add weights to the different criteria) and make any of the frameworks come out on top.

You can click through the presentation below, download it from my presentations page, or see it on SlideShare.

I started writing the second presentation a week before I had to deliver it. On Thursday, September 10th, I stayed up late, trying to figure out how to create a good presentation on NoXML and finish the last part of the JHipster Book. Then it came to me, I needed to parallelize and do them both at the same time. I decided to compare AppFuse (which is similar to a legacy Spring application with lots of XML) to JHipster (which hardly contains any XML).

I wrote a 10-page Google Doc on how I planned to do this, then went rafting and camping with my family for the weekend. I finished most of the presentation on Monday night, but then realized the presentation wouldn't be long enough to fill 90 minutes. So I hunkered down at midnight, created a new AppFuse application and removed a bunch of its XML. This took me until 3:30am, and I was able to accomplish the following tasks:

• Spring XML to Java
• Spring Security Configuration to Java
• web.xml to WebApplicationInitializer
• Spring MVC to Java
• Migrated to Spring Boot
• Maven to Groovy

I was pretty pumped when I completed my final goal: converting to Spring Boot and getting a test to pass. I made commits to an appfuse-noxml project on GitHub as I accomplished each step. You can see all the changes in the project's commit log. While I'd figured everything out, I still needed to complete the presentation. Luckily, I found time to do this the night before, the morning of, and in the final hour before I had to deliver the talk. You can imagine my relief when I was done delivering both talks.

You can click through the presentation below, download it from my presentations page, or view it on SlideShare.

While I didn't get to spend much time at the conference, I did have a lot of fun while I was there. I got to meet some new folks, reconnect with old friends, and enjoy beers and dinner with a smiling crew on Thursday night. The Broncos victory late that night was the icing on the cake.

Minecraft Modding at Denver's Devoxx4Kids

Last weekend, Denver's Devoxx4Kids gathered at Tuliva to learn about Modding Minecraft. Several kids (ages 7-15) were introduced to programming Java by the founder of Devoxx4Kids USA, Arun Gupta, and his son, Aditya.

They used Java 8, Eclipse, Minecraft Forge and to show you how to create mods that could give you potatoes, skeleton cows, and even launch into different dimensions. The skeleton war was a big hit too. We had a record turnout at this event, and the space was fabulous. The live broadcast from vJUG went very smoothly and Tuliva's large screen and sound served us well. It was pretty sweet when we got shout-outs from the vJUG crew too!

Simon Maple wrote a great summary of the session that includes the video we watched, as well as an interview with Arun and Aditya. Take a look at Devoxx4Kid's Minecraft Modding Tutorial if you'd like to see what we learned.

We did run into a couple issues while trying to follow along. The first was that the virtual machines we were using wouldn't run the Minecraft client. The error we saw was:

org.lwjgl.LWJGLException: Pixel format not accelerated

We later learned from Arun that virtual machines were an issue and it's better to use Forge on a local machine. The second issue we ran into was when folks tried to build Forge from source, they got a 500 error when it tried to download http://export.mcpbot.bspk.rs/versions.json. We later learned that the firewall was blocking it.

Despite these issues, I believe the kids learned a lot by watching the vJUG broadcast. I spoke with some parents that got things working in the class, as well as a few that tried it when they got home. After the modding session, I showed the class how to create a Minecraft Server on AWS. I also did some research to see if you could automate the server creation. I quickly landed on Thomas Offermann's site and his tutorials:

• Introducing Minecloud
• Running Minecraft on Amazon EC2
• The Minecloud Web App

Thomas created a couple GitHub projects: one to setup a Minecraft server on AWS, as well as a webapp that you can start/stop it with. I haven't tried either project yet, but I hope to soon.

Thanks to all the Denver kids and parents that joined us last weekend! The Tuliva facilities were spacious and comfortable. We owe them a big thanks for sponsoring Devoxx4Kids Denver! We hope to do another workshop this fall, possibly on Raspberry Pi.

How do I become a programmer?

Yesterday, I received a message from a friend, asking about how to become a programmer. It's not the first time I've been asked this. In fact, this summer I've been asked by several friends how to get into the field. It seems that as people grow older, they see the lifestyle of working remotely and enjoying their job as an attractive thing to do. In yesterday's case, this friend is a mom that now has her days free because all her kids are in school. Here's what she wrote:

Now that my girls are both in school full day, I've been thinking about taking some programming classes. It's something I started to do while I was working at [ABC Company], but obviously didn't pursue once I quit to have kids. I'm thinking of getting my MIS in web development or specializing in designing apps if that's even a thing? Anyway, what languages would you recommend I concentrate on? JavaScript, Python? Lastly, is there a particular school you would recommend? I can't afford DU on my stay-at-home-mom salary, or even Regis which is where I started when I was getting tuition reimbursement. I was hoping I could do most of my education online while the kids are in school? Any advice or words of wisdom would be greatly appreciated!

Since this is a common question I see, I figured I'd publish my answers here, and get some advice from y'all too. Here's my response:

Her response was interesting, as she thought she might need a CS degree to even get a programming job.

Coincidentally I looked over many of these coding sites yesterday but wasn't sure if I needed an accredited diploma. It sounds like it's more important that I just get some experience.

From my experience, a college degree matters, but not a CS degree. I told her people skills make programmers stand out and she's a witty person that certainly has those. What's your advice as a programmer? What would you tell people to do if they want to break into the field?

More importantly, if you're on the hiring side, what would it take for you to hire a 40-something person with no programming background? If they've been studying for six months and have really good people skills, would you hire them for a junior position?

Setting up a Minecraft Server in the Cloud

My 10-year-old son, Jack, is a huge fan of Minecraft. If you let him, he'd play all day, skipping meals and having a blast. It's most fun to hear him playing with his sister or his best friend. I'm amazed it's captured his attention for so long; well over two years. Both my kids loved it when Scott Davis taught a Devoxx4Kids Denver class on Server-side Minecraft programming.

We haven't had any Devoxx4Kids Denver workshops this year, but that's about to change. First of all, I'm happy to announce we're working with the Rocky Mountain Oracle Users Group to have a Day of Family Coding Fun at Elitch Gardens this Friday. There will be a workshop on Raspberry Pi and I'll be doing a demonstration on how to setup a Minecraft Server in the cloud. Next weekend, we'll be doing a more in-depth Minecraft Workshop at Devoxx4Kids Denver. If you'd like to join us please RSVP. Since having your own Minecraft Server is a fun thing for kids, and useful for parents, I figured I'd document how to do it here.

First of all, let me say that I'm standing on the shoulders of giants. When I first setup a Minecraft server, I used Ben Garton's Setting up a free Minecraft server in the cloud - part 1 as well as part 2 and 3. I also found Aaron Bell's How to run a Minecraft server on Amazon EC2 to be quite useful.

Without further ado, here's you how to setup a Minecraft Server on Amazon Web Services (AWS) in 2015!

UberConf 2015: My Presentations on Apache Camel and Java Webapp Security

Last week I had the pleasure of speaking at UberConf 2015. My first talk was on Developing, Testing and Scaling with Apache Camel. This presentation contained an intro to Apache Camel and a recap of my experience using it at a client last year. You can click through the presentation below, download it from my presentations page, or view it on SlideShare.

My second presentation was about implementing Java Web Application Security with Java EE, Spring Security and Apache Shiro. I updated this presentation to use Java EE 7 and Jersey, as well as Spring Boot. I used Spring Boot to manage dependencies in all three projects, then showed the slick out-of-the-box security Spring Boot has (when you include the Spring Security on the classpath). For Apache Shiro, I configured its filter and required dependencies using Spring's JavaConfig. You can click through my security presentation below, download it from my presentations page, or view it on SlideShare.

One thing that didn't make it into the presentation was the super-helpful pull request from Rob Winch, Spring Security Lead. He showed me how you can use basic and form-based authentication in the same app, as well how to write tests with MockMvc and Spring Security's Testing support.

The next time I do this presentation (at the Rich Web Experience), I'd like to see if it's possible to use all-Java to configure the Java EE 7 example. I used web.xml in this example and the Servlet 3.0 Security Annotations might offer enough to get rid of it.

All the demos I did during the security presentation can be seen in my java-webapp-security-examples project on GitHub. There's branches for where I started (javaee-start, springsecurity-start and apacheshiro-start) as well as "complete" branches for where I finished. The complete examples should also be in-sync with the master branch.

If you have any questions about either presentation, please let me know.

Grails + Angular vs. JHipster

I recently received an email from a long time follower of my comparing web frameworks research and presentations. He asked some interesting questions:

I am starting on a new venture to build a direct to consumer web application. I am planning to leverage Cloud services to build my CI/CD pipeline. I am very strong with Java Backend/middleware and learning Javascript Front-end frameworks. I love Spring and SOFEA. Having said that, I am wondering if I should use Grails + Angular or JHipster? My primary concern with JHipster is there is hardly any ‘community', there is Julien and whatever he says/thinks goes! Can you give me some pointers?

I imagine there's other JVM developers with similar questions, so I figured I'd publish my response for all to see.

Yes, I'm probably a bit biased since I'm writing a JHipster book. However, it's been easy for me to introduce and use Spring Boot at my last few clients. They were already using Spring, so the transition to using a Spring simplifier was a no-brainer. I haven't had as much luck getting clients to adopt Grails, even though I've suggested it. That could change now that it's based on Spring Boot.

What's your experience? Would you recommend Grails + Angular over JHipster? If so, why?