Matt RaibleMatt Raible is a Web Developer and Java Champion. Connect with him on LinkedIn.

The Angular Mini-Book The Angular Mini-Book is a guide to getting started with Angular. You'll learn how to develop a bare-bones application, test it, and deploy it. Then you'll move on to adding Bootstrap, Angular Material, continuous integration, and authentication.

Spring Boot is a popular framework for building REST APIs. You'll learn how to integrate Angular with Spring Boot and use security best practices like HTTPS and a content security policy.

For book updates, follow @angular_book on Twitter.

The JHipster Mini-Book The JHipster Mini-Book is a guide to getting started with hip technologies today: Angular, Bootstrap, and Spring Boot. All of these frameworks are wrapped up in an easy-to-use project called JHipster.

This book shows you how to build an app with JHipster, and guides you through the plethora of tools, techniques and options you can use. Furthermore, it explains the UI and API building blocks so you understand the underpinnings of your great application.

For book updates, follow @jhipster-book on Twitter.

10+ YEARS


Over 10 years ago, I wrote my first blog post. Since then, I've authored books, had kids, traveled the world, found Trish and blogged about it all.
You searched this site for "grails". 129 entries found.

You can also try this same search on Google.

The Modern Java Web Developer Bootcamp at Devoxx

At this year's Devoxx, I'll be delivering my first University session. University talks are in depth presentations of 3 hours (= 75m + 30m break + 75m). I'm calling it The Modern Java Web Developer Bootcamp and my goal is to teach people some new concepts and techniques that'll make them more valuable developers. My session's hashtag is #dv13-javaweb$ to exemplify the important takeaways: Java is back, web development is fun and you can make more money.

Three hours is quite a bit longer than I'm used to, but I'm confident I can fill the time with lots of knowledge. My plan is to enhance my presentation from JavaOne and add a few demos. Currently, I'm thinking of developing the following additional content:

  • HTTP Overview (with SPDY)
  • Polymer and Web Components
  • Bootstrap 3 Overview
  • HTML5 Storage
  • API Framework Comparison (Play, Grails, Dropwizard)
  • Load Testing
  • Performance Monitoring (including RUM)
  • Internal Cloud Options

For demos, I'd like to show a few that provide real value to attendees and teach them how to do something they haven't done before. The ones below are candidates I'm thinking of, and I'd like to pick three for the final presentation.

  • Browser Tools Demo
  • Developing with Bootstrap Demo
  • AngularJS Demo
  • Refactor an app from Spring to Java EE, no XML, all Java 8
  • Page Speed Improvement Demo
  • Security Demo (add LDAP to Angular app + OWASP ZAP)

If you could pick three real-time tutorials from the choices above, which ones would you choose?

I'm also thinking of adding some stories about impressive loads served with very little hardware and real-time dashboard development. If you have a story about either of these, please let me know. I'd be happy to credit you (or your company) and talk about any technical implementation details you're willing to provide.

Posted in Java at Oct 29 2013, 10:21:49 AM MDT 10 Comments

JavaOne 2013: My Presentations

I flew into San Francisco this past Monday to speak at JavaOne 2013, and to meet with my new client. I made sure to wear a Broncos shirt since I was riding the train through Oakland and had some co-workers that were Raiders fans. My trip started off nicely as the Broncos dismantled the Raiders on Monday Night Football. My new team and I watched it during a team dinner at Havana in Walnut Creek. Historically, the Broncos and Raiders have had a heated rivalry historically, so the win was the perfect start to the week. :)

On Tuesday, I worked from my hotel in the morning, then met James Ward to do some last minute prep for our smackdown. The prior week, we both upgraded our respective apps to use the latest versions of Grails and Play Framework. I ran into a few issues when upgrading, while Play required some API changes.

We both added Memcachier to our apps (to share caching between dynos) and ran some Apache Bench tests. The results showed quite a bit of slowdown compared to last time, which we attributed to caching needing to make network hops. Other than that, we both had to make changes to our framework's buildpacks to get the latest versions running on Heroku, and when we headed for our talk, my instance of Grails wasn't running (60 second boot timeout on startup). The good news is it somehow solved its issues during our talk and was up and running when I checked it after, as it is now. Below is an embedded version of the presentation we delivered. You can also click here to see it in a new window, or view it on SlideShare.

On Wednesday morning, I tried to attend Venkat's Programming with Lambda Expressions in Java, but quickly discovered it was sold out. My talk on The Modern Java Web Developer started shortly after and I had a fantastic time talking to a packed room and preaching the virtues of learning and staying up-to-date with web technologies. I made sure to include a slide on Avatar, an Oracle-sponsored JavaScript-based framework that requires "very minor JavaScript knowledge". You can view my presentation below or on SlideShare.

According to @JavaOneConf, all JavaOne 2013 presentations will be published on Parleys.com.

After completing my talks, I journeyed to my client and practiced what I preached, successfully finishing a spike that reduced page load time from 8 seconds to 2 seconds. That evening, I attended the Oracle Appreciation Event at Treasure Island, had some cold beer and listened to some loud music.

I had a great time speaking at JavaOne this year, and look forward to my next speaking engagement. In November, I'll be traveling to Devoxx where I'll be giving a 3-hour University session on The Modern Java Web Developer. Hope to see you there!

Posted in Java at Sep 27 2013, 01:35:01 PM MDT 5 Comments

JavaOne 2013: My First Time Speaking

I've been to JavaOne many times in my life, starting in 2004 and continuing in 2005, 2006 and 2008. I have fond memories of the first couple years, meeting all the Java open source guys and having a lot of fun.

You might notice that the aforementioned blog posts no longer show pictures. That's because they were originally hosted on Apple's HomePage, which they shut down years ago. I haven't bothered to republish the photos and fix the links, but I do still have them. For those looking for a blast from the past, checkout Mike, Howard and James or Bruce and Marc. I also have a set of photos from our Geronimo Live party in 2006.

As many of you know, JavaOne used to be a huge conference, attracting 15,000 attendees back in the day. Numbers have dwindled a lot since Oracle bought Sun and I've heard recent years are more around 1500. Since I've spoken at a lot of conferences, but never JavaOne, I figured I'd try this year. The good news is I got accepted and I'll be there next week!

On Tuesday afternoon, I'll be presenting the Play Framework vs Grails Smackdown with James Ward. On Wednesday morning, I'll be talking about The Modern Java Web Developer. I also look forward to The Black Keys on Wednesday night.

I have a feeling it's gonna be a great week!

Posted in Java at Sep 19 2013, 05:50:34 PM MDT 4 Comments

Developing with AngularJS - Part III: Services

This is the 3rd article in a series on my experience developing with AngularJS. I used AngularJS for several months to create a "My Dashboard" feature for a client and learned a whole bunch of Angular goodness along the way. For previous articles, please see Part I: The Basics and Part II: Dialogs and Data.

Angular offers several ways to interact with data from the server. The easiest way is to use the $resource factory, which lets you interact with RESTful server-side data sources. When we started the My Dashboard project, we were hoping to interact with a REST API, but soon found out that it didn't have all the data we needed. Rather than loading the page and then making another request to get its data, we decided to embed the JSON in the page. For communication back to the server, we used our tried-and-true Ajax solution: DWR.

In Angular-speak, services are singletons that carry out specific tasks common to web apps. In other words, they're any $name object that can be injected into a controller or directive. However, as a Java Developer, I tend to think of services as objects that communicate with the server. Angular's documentation on Creating Services shows you various options for registering services. I used the angular.Module api method.

[Read More]

Posted in The Web at Jun 25 2013, 07:03:26 AM MDT 10 Comments

Developing with AngularJS - Part I: The Basics

There's many, many different introductions to AngularJS available on the internet. This article is not another introduction, but rather a story about my learning experience. It all started way back in January of this year. I was working as a UI Architecture Consultant at Taleo/Oracle, my client for the last 21 months. My gig there ended last month, but they agreed to let me publish a series of articles about the knowledge I gained.

Project Background

The Director of Product Management had been working on the concepts for a new project - codenamed "Visual MyView". Below is a mockup he created for our kickoff meeting on January 4th.

My Dashboard - Original Mockup

From his original email about the above mockup:

The intent here is that one of the columns has rows that have a similar width. The rows could be dragged and dropped into a different order – or potentially the two columns could also be reordered. The rows will basically be comprised of similar widgets. You can see in the mockup how the first two rows might look – and sample widgets. The widgets shown can be configured by the end user, as well as the order in which they are displayed. Other requirements given to us were the following.

  • Row 1 is comprised of 'summary' widgets that are 'todo' items. Reviews needing done – approvals required – etc.
  • Row 2 will be a graph row – having graphs and charts to display information – larger squares will build this row.
  • Row 3's content was not determined yet.

I started the initial layout with static HTML and CSS and had a wireframe to show by mid January.

Wireframe

By the end of January, we'd renamed the project to My Dashboard and had a working prototype using CoolClock and moment.js for the clock in the top right, AngularJS to display widget data, jQuery UI for drag-n-drop of rows and widgets, Bootstrap's Carousel for holding charts and Highcharts for rendering charts.

[Read More]

Posted in The Web at Jun 18 2013, 09:06:52 AM MDT 9 Comments

Paris and Iceland, A Photographer's Paradise

In February 2012, Trish and I traveled to Stockholm on Icelandair. We were immediately impressed with the airline's excellent service. Trish was also a bit miffed that we had a layover in Iceland without an opportunity to get out and see the sites. You see, Iceland is a Photographer's Paradise, and she's the best photographer I know.

This year, when planning our trip to Devoxx France, I set out to correct this missed opportunity. Since Icelandair now flies direct from Denver, and offers free stopovers, our planning was easy.

The conference was in Paris; one of the most magnificent cities to photograph. Trish has some great photos from 2011. She'll be showing many of these photos at an upcoming exhibit at Paris on the Platte in Denver. However, she wanted more.

We arrived in Paris for Devoxx France on Tuesday, March 26th. The first day's excursion started with visiting the Latin Quarter, the Panthéon and Notre Dame.

Panthéon in the evening Panthéon with Bus

Notre Dame Paris along the Seine River France

We had a nice dinner that evening while watching the Fútbol match between France and Spain. On Wednesday, we hung around the hotel in the morning, then took the metro to La Basilique du Sacré Coeur de Montmartre and Moulin Rouge.

La Basilique du Sacré Coeur de Montmartre

From there, we journeyed to the Eiffel Tower for a hike. We climbed the stairs to the second floor and enjoyed the spectacular view.

View of Paris from Tour Eiffel

Wednesday evening, we attended the Devoxx Speakers Dinner. We had a great time chatting and drinking wine with Martin Odersky, Guillaume Bort, the many Nicolas', James Ward and Josh Long.

Nicolas' Martin and Nicolas

Guillaume Bort and Martin Odersky Shenanigans :)

On Thursday, I delivered my talk on Comparing JVM Web Frameworks in the early afternoon and did Play vs. Grails Smackdown with James Ward in the evening. I published an article about these talks the next day.

James Ward and I at Devoxx France

While I was talking about frameworks, Trish was galavanting around Paris taking some amazing photos.

Our Lady Liberty and Eiffel Tower Boats Seine River Eiffel Tower Récipon Quadrigas France Statue Of LaFayette Cours La Reine Paris Frances Pont Alexandre III Bridge Paris

Thursday night, we had a wonderfully authentic French dinner with many of the folks from the conference. Around midnight, Trish captured the beauty of Les Invalides.

Les Invalides by Night

On Friday, we slept in a bit and then headed to the airport for our flight to Iceland. A few hours later, we were snuggled into the cozy bar at Hotel Reykjavik Centrum. A few hours after that and we were bouncing up and down on a Super Jeep tour to see the Northern Lights. Our driver kept telling us "if you believe, it will happen". And boy oh boy, did it ever. The green and purple lights dancing in the sky overhead were mind-blowing!

Northern Lights 12 Northern Lights 13

Northern Lights 19 Northern Lights 20

Saturday came quickly after a late night, and we opted for a scenic tour of the area by helicopter.

Bird's eye view of the Reykjavik Iceland Opera House overlooking the bay and Mountains Glymur Falls

Matt and me and our Pilot Eggert with our Bell

Saturday evening, we journeyed through the ages with a tour and tasting at the Icelandic brewery Ölgerðin. The Grillmarkadurinn restaurant afterward was delicious.

Easter Sunday was our last day in Iceland and we enjoyed most of it at the Blue Lagoon. Despite the plethora of tourists, the hot springs, saunas and cold beer were a lovely way to prepare for the long road home.

Blue Lagoon Rocks! Great Road in Iceland

Visiting Iceland and photographing the Aurora Borealis was an awesome experience. Speaking at Devoxx France, photographing Paris and having lots of good times with new (and old) friends was equally delightful. For more pictures of our travels, see my Paris and Iceland Album or Trish's Devoxx France, Iceland or Northern Lights albums.

Posted in General at Apr 12 2013, 10:31:24 AM MDT 3 Comments

Happy 10 Year AppFuse!

10 years ago yesterday, I released the first version of AppFuse. It started with XDoclet generating ActionForms from POJOs and became very popular for Struts developers that wanted to use Hibernate. The project's popularity peaked in 2006, as you can see from the mailing list traffic below.

AppFuse Mailing List Traffic

It's possible the decrease in traffic is because we re-wrote everything to be based on Maven. It's also possible it was because of more attractive full-stack frameworks like Grails and Rails. However, the real reason is likely that I stopped working on it all the time due to getting a divorce becoming an awesome dad.

Below is a timeline of how the project evolved over its first 4 years.

AppFuse History: 2003 - 2007

AppFuse has been a great project for me to work on and it's been a large source of my knowledge about Java, Web Frameworks, Spring, Hibernate - as well as build systems like Ant and Maven. We started with CVS, moved to SVN and now we're on GitHub. We've experienced migrating from Tapestry 4 to Tapestry 5 (thanks Serge Eby!), upgrading to JSF 2 and enjoyed the backwards compatibility of Spring and Struts 2 throughout the years. We've also added REST support, a Web Services archetype and kept up with the latest Spring and Hibernate releases.

AppFuse History: 2007 - 2013

Last year, we added Bootstrap and jQuery as foundational front-end frameworks. For our next release, we're switching to PrimeFaces, adding Wicket and changing from jMock to Mockito. Most of these changes are already in source control, we just need to polish them up a bit and add AMP support. I hope to release 3.0 before the bus is done. ;)

Thanks to all the enthusiastic users of and contributors to AppFuse over the years. It's been a great ride!

Posted in Java at Apr 05 2013, 08:56:45 AM MDT 3 Comments

Devoxx France: A Great Conference in a Magnificent City

Red Eiffel flowers This week, my lovely fiancé and I traveled to the City of Light. Our journey was designed around some speaking engagements at Devoxx France. Devoxx is one of my favorite conference franchises and Devoxx France has been special to me ever since the Devoxx (Belgium) I spoke at in 2011.

2011 was the year I spoke about my experience with Play, Scala, CoffeeScript and Jade. I wrote the presentation on my flight over, composed the demo video the night before and made it all happen in the nick of time. Of course, this was after 120 hours of research and preparation, so the presentation composition process had all the data I needed. You can imagine my sense of relief after pulling off that talk and getting an enthusiastic applause from the audience for my efforts.

One of the first audience questions I received was from Nicolas Martignole, asking if I'd speak at Devoxx France the following year. I whole-heartedly agreed to do it and was excited for the opportunity. It was with great disappointment that I later found out I couldn't attend Devoxx France in 2012. My client didn't like me taking so much time off and I agreed to scale my two week vacation back to 1 week. This year, I was determined to go, so I submitted some of my favorite talks: Comparing JVM Web Frameworks and The Play vs. Grails Smackdown with James Ward. I was extremely pleased when they both got accepted.

Side Story: I met Martin Odersky shortly when he sat down next to me for the Java Posse presentation in Belgium in 2011. After shaking his hand and introducing myself, I had to politely ask him to leave because it was Trish's seat. Talk about awkward; but Martin was very gracious and promptly found a new seat close by.

The Paradox of Choice Comparing JVM Web Frameworks
Both talks required a bit of updating. For Comparing JVM Web Frameworks, I started reading The Paradox of Choice and found many parallels to the agony that developers experience with choosing a web framework. I described how I didn't think good framework decisions were based on the many, many features that frameworks have, but often on pre-defined constraints. There's those lucky developers that get to choose a Full Stack Framework because they're doing greenfield development. Then there's those that want a better Pure Web Framework that replaces something (e.g. Struts) that's not satisfying their needs. And lastly, there's those that've found it possible to leverage a SOFEA and use a JavaScript MVC framework with an API Framework on the backend. I don't think it makes sense to compare all web frameworks and I tried to use these pre-defined constraints (language, platform and application type) argument to separate into categories and help make choosing easier.

I took out the parts of the presentation that've pissed people off in the past - particular the JSF bashing by James Gosling, the Rails gushing from Craig McClanahan and the Pros and Cons sections of each framework. I added the history of web frameworks and research from InfoQ and devrates.com.

History of Web Frameworks 2013

The best part of the JVM Web Frameworks talk was the audience's reaction and enthusiasm. Devoxx always seems to attract passionate developers and Devoxx France was no different. Developers packing the room, clapping after your intro, laughing at your jokes, signifying that they agree with you about JSF. As a speaker, it's an unbelievable experience.

You can view my Comparing JVM Web Frameworks presentation below or on Slideshare.net.

Play Frameworks vs. Grails Smackdown
To prepare for James Ward and my Play vs. Grails Smackdown, we had a number of goals. First of all, we wanted to update our apps to use the latest versions of each framework. I documented what it took for Grails, James just checked in his code to GitHub. It was interesting to see that Grails 2.0.3 -> 2.2.1 caused a number of issues with testing, while Play 2.0.3 -> Play 2.1.0 required API changes, but nothing for tests. Secondly, we updated all the stats for our pretty graphs and ran load tests again.

This is where the fun started. On Tuesday evening, I decided to challenge the notion that Play was twice as fast as Grails. James had proven this with Apache Bench tests. With Play 2.0 and Grails 2.0 (last summer), we clocked Play at 251/requests per second and 198 for Grails. After upgrading each app to the latest releases, we found the numbers to be 233/second for Play and 118 for Grails.

However, Apache Bench only tests until the first byte is received. Since I've done a lot of browser optimizations recently, I fired up whichloadsfaster.com, captured a screenshot and added it to our presentation. The next day, James added a CDN and a bunch of caching to his app and re-ran his AB tests.

Now he was smoking Grails, so I added a CDN and caching as well. However, the best I could do was just over 1000/requests per second, while he was around 2200/second. When he ran live tests during our talk, Play was around 2800/sec and Grails was around 900.

It was great to see how much better performance we could get with caching and a CDN. The best part is this should be available to most applications, not just these frameworks. By adding a CDN (we used Amazon CloudFront) and caching, we were both able to 10x the performance of our apps. You can find our presentation here or view it below.

Summary
This was a very enjoyable conference to attend as a speaker. First of all, it was in one of the most beautiful cities in the world, but it's also a very special place for Trish and I. We got engaged just outside of Paris in Versailles after the last Devoxx conference I spoke at. Trish has some amazing photos from that trip. Secondly, the Devoxx conference attracts a special kind of developer - one that is passionate about and eager for knowledge. Lastly, speaking with my good friend James, in an exotic city about something we love - that was special. Asking for beers and having them brought to us at the start of our Smackdown. That was magical (thanks Nicolas!).

To all the Devoxx organizers and crew - well done on a great show!

Posted in Java at Mar 29 2013, 01:14:30 PM MDT 3 Comments

Upgrading Grails from 2.0 to 2.2

Grails In preparation for my Grails vs. Play Smackdown at Devoxx France next week, I recently upgraded my Grails version of Happy Trails from Grails 2.0.3 to Grails 2.2.1. I ran into a few issues along the way and figured I'd document them here to help others out.

Fixing the source
The first issue I ran into was Spock and Groovy 2 incompatibilities.

| Resolving plugin JAR dependencies
| Error WARNING: Dependencies cannot be resolved for plugin [mail] due to error: startup failed:
Could not instantiate global transform class org.spockframework.compiler.SpockTransform specified at jar:file:/Users/mraible/.grails/ivy-cache/org.spockframework/spock-core/jars/spock-core-0.7-groovy-1.8.jar!/META-INF/services/org.codehaus.groovy.transform.ASTTransformation  because of exception org.spockframework.util.IncompatibleGroovyVersionException: The Spock compiler plugin cannot execute because Spock 0.7.0-groovy-1.8 is not compatible with Groovy 2.0.7. For more information, see http://versioninfo.spockframework.org

I posted the problem to StackOverflow and got a response almost immediately. While this pull request helped me quite a bit, it was ultimately caused by my vision: I had two "geb-spock" dependencies listed in BuildConfig.groovy with different groupIds.

At this point, I also moved all my plugin dependencies from application.properties to BuildConfig.groovy.

The next problem I ran into was a unit test and functional tests failing. The unit testing issue was caused by my Direction model not being in the tests @Mock annotation. After I added it, validation kicked and I recognized my test was invalid. I added @Ignore and continued.

The functional test seemed to be seemed to be caused by Geb and it trying to use the Chrome Driver. One of my tests didn't work with the default HtmlUnitDriver, so I used the ChromeDriver for the one test.

| Running 11 spock tests... 6 of 11
| Failure:  signup as a new user(happytrails.AuthenticatedUserSpec)
|  org.openqa.selenium.WebDriverException: Unable to either launch or connect to Chrome. Please check that ChromeDriver is up-to-date. Using Chrome binary at: /Applications/Google Chrome.app/Contents/MacOS/Google Chrome (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 45.66 seconds
Build info: version: '2.27.0', revision: '18259', time: '2012-12-05 11:30:53'
System info: os.name: 'Mac OS X', os.arch: 'x86_64', os.version: '10.8.2', java.version: '1.7.0_04'
Driver info: org.openqa.selenium.chrome.ChromeDriver
    at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:187)
    at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:145)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:533)
    at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:216)
    at org.openqa.selenium.remote.RemoteWebDriver.(RemoteWebDriver.java:111)
    at org.openqa.selenium.remote.RemoteWebDriver.(RemoteWebDriver.java:115)
    at org.openqa.selenium.chrome.ChromeDriver.(ChromeDriver.java:161)
    at org.openqa.selenium.chrome.ChromeDriver.(ChromeDriver.java:107)
    at happytrails.AuthenticatedUserSpec.signup as a new user(AuthenticatedUserSpec.groovy:25)

Even when running "grails -Dgeb.env=chrome test-app", this still happened. This was caused by the fact that I had GebConfig.groovy in test/functional/happytrails. Move it to test/functional solved the problem. I also discovered that I know longer needed Chrome to get this test to pass. Apparently, the HtmlUnitDriver has issues with Grails 2.2, but it seems to work for me.

After getting the Geb configuration fixed, I ran into a functional test failure:

| Running 11 spock tests... 5 of 11
| Failure:  click signup link(happytrails.AuthenticatedUserSpec)
|  org.openqa.selenium.ElementNotVisibleException: Element must be displayed to click (WARNING: The server did not provide any stacktrace information)

Even though I could see the "signup" link when I ran "grails run-app", I could see that it didn't show up when running tests in Chrome. This turned out to be caused by an extraneous <div class="nav-collapse"> I had in my main.gsp. Removing it solved the problem. It's strange that this never showed up with Grails 2.0. My only guess is that Geb someone didn't look at the visibility of the element.

The last testing-related issue I ran into was a InvalidElementStateException:

| Running 11 spock tests... 7 of 11
| Failure:  add new route to region(happytrails.AuthenticatedUserSpec)
|  org.openqa.selenium.InvalidElementStateException: Element must be user-editable in order to clear it. (WARNING: The server did not provide any stacktrace information)

I was able to fix this by changing AddRoutePage.groovy from:

static content = {
    createButton(to: ShowRoutePage) { create() }
    name { value("Name") }
    distance { value("Distance") }
    location { value("Location") }
}

To:

static content = {
    createButton(to: ShowRoutePage) { create() }
    form { $("form") }
}

And then referencing name, distance and location accordingly (form.name, etc.) in AuthenticatedUserSpec.groovy.

CloudBees
After I had everything working locally, I logged into Jenkins on CloudBees. Since I hadn't used it in a while, I had to wait a bit while my Jenkins server was re-commissioned. Once it was up, I tried to select Grails 2.2.1 to build with, but found it wasn't available. After a tweeting this, I learned about Grails Wrapper, found that the latest Grails Jenkins plugin supported it and got everything working. I later discovered that CloudBees does support Grails 2.2.1, I just needed to setup another Grails installation to automatically download and install 2.2.1.

Heroku
The last two issues I ran into were with Heroku. Since I was upgrading everything, I wanted Grails to build/run under Java 7 and use Servlet 3. I changed the appropriate properties in BuildConfig.groovy, configured Heroku and deployed. No dice.

Error Compilation error: startup failed:
Invalid commandline usage for javac.
javac: invalid source release: 1.7
Usage: javac  
use -help for a list of possible options

Sidenote: I tried building with Java 8 on CloudBees, but discovered the searchable plugin doesn't support it.

Compile error during compilation with javac.
/scratch/jenkins/workspace/Happy Trails - Grails 2/work/plugins/searchable-0.6.4/src/java/grails/plugin/searchable/internal/compass/index/DefaultUnindexMethod.java:94: error: reference to delete is ambiguous
                    session.delete(query);
                           ^
  both method delete(CompassQuery) in CompassOperations and method delete(CompassQuery) in CompassIndexSession match

As far as Servlet 3, it was pretty obvious that the Jetty version Heroku uses for Grails doesn't support it. Therefore, I reverted back to Servlet 2.5.

java.lang.NoClassDefFoundError: javax/servlet/AsyncContext
	at org.codehaus.groovy.util.LazyReference.getLocked(LazyReference.java:46)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:59)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2444)

I sent the Java 7 issue to Heroku Support a few days ago but haven't heard back yet.

Summary
While upgrading Grails from 2.0 to 2.2 wasn't as easy as expected, it is understandable. After all, Grails 2.2 ships with Groovy 2.0, which has a bunch of new features itself. All the issues I ran into were fairly easy to solve, except for Java 7 on Heroku. But hey, what do you expect from a free hosting service?

If you're at Devoxx France next week, I look forward to sharing our research on Grails 2.2.1 vs. Play 2.1.0.

Posted in Java at Mar 22 2013, 09:16:37 AM MDT 2 Comments

How do you choose web framework candidates to compare?

David Díaz Clavijo sent me an email a couple weeks ago asking me about comparing web frameworks. David is a computer engineering student at the University of Las Palmas de Gran Canaria (ULPGC) in the Canary Islands, Spain. His FYP (Final Year Project) is a web frameworks comparison focused on high productivity frameworks. He's started a blog to help facilitate his work and has been writing some interesting posts.

Four frameworks will be compared. The comparison test is composed by four fixed time tasks for each framework:

  • Learning the programming language: 5 hours
  • Making exercises in the programming language: 15 hours
  • Learning the framework: 25 hours
  • Developing the website: 50 hours

After all process is done, it can be seen which framework presented a higher productivity and smaller learning curve.

We have decided a cross-language set of frameworks which are: Ruby on Rails, Grails, Django and Code Igniter.

Today, he wrote about the web frameworks he's decided to compare and inspired me to respond to his original request for my thoughts.

Hello David,

Sorry it took me so long to respond. I think your approach as far as learning the language, making exercises, learning the framework and developing the website is good. As you know, the last one you develop with will likely do well because you're repeated the steps so much with the other ones.

However, there's one thing I think you're doing wrong. In the real world, I don't believe that an architect would look at *all* the available web frameworks and choose one. I believe most of them already have a language bias or there's a target platform (e.g. LAMP, JVM, etc.).

I believe the majority of development happens today where a platform is already in place. Even moreso, the backend may already be in place and the company is simply trying to find a more productive front-end framework. In the first instance, where the platform is already chosen, the chooser's options are immediately limited. For example, if it's the JVM, Django might be eliminated because JPython isn't that up-to-snuff or widely used (this could be changing). However, it could be said that all the frameworks you've chosen (including Code Igniter) can run on the JVM.

I just don't see people identifying web frameworks across such a wide variety of languages. I think folks generally choose a platform, then a language, then a framework. It's possible that startups will do it differently by choosing a language first. However, I imagine most startups have a technical founder that already has some preference towards a particular language.

Now it's your turn, dear readers. Have you ever been in a situation where you've been able to pick a web framework across all languages? Did any of your biases enter into the equation?

How would you recommend David go about choosing web framework candidates?

Posted in Java at Mar 18 2013, 12:10:14 PM MDT 5 Comments