The Changing Nature of Enterprise Java Application Development, 9:00 – 9:45 by Adrian Colyer

During his talk, the speaker described the audience the future of a Java platform, because it is actually going to be there for a long time now.
He mentioned the dynamic languages compatible with the JVM : Groovy, JRuby, Scala, and Clojure.
He mainly focused on Groovy (which belongs to SpringSource by the way), even if he was not sure if whether JRuby or Groovy would win the « war of dynamic languages ».
For the web platform, he mentioned Grails, built on top of Groovy, Rails running on top of Ruby, and Lift built on top of Scala.
He finished his talk introducing OSGi and Spring DM; the future of enterpise is application may be in the cloud : easily to deploy and scale applications are to come.

The android runtime environment, 10:30 – 11:20, by Joerg Pleumann

The speaker first made an introduction to the Android system, as a platform competing windows mobile and palm.
More technically speaking, it is based on a Linux kernel (along with necessary drivers : display, camera, sound, etc…).
On top of it come the Android Runtime and libraries; the talk is about the Android Runtime and its Dalvik VM.
Dalvik VM : CPU between 250 and 500 MHz, RAM >=64 (equivalent to a 1999 PC), but low power consumption is critical.
The Dalvik VM is really efficient, using explicit registers to keep temporary values: the immediate benefit is the number of lines of the bytecode resulting from the DalvikVM compilation : nearly 30% less than a standard VM compilation.
A dex file (Dalvik Executable) contains several files, and is not compressed.
JNI is ready, a sdk for using JNI is about to come out in the next days; also an Android Debug Bridge is available from the beginning.
The core libraries
dalvik vm specific libraries : dalvik.*
java compatibility libraries : java.* and javax.*
and some apache libraries(mainly for http) : org.apache.*
The core libraries are partly taken from Apache Harmony (a JDK implementation by Apache), partly written from scratch; and some of them have been optimized (using JNI)
The core libraries are mostly compatible to a subset of J2SE 5.0.
JDBC 2.0 is supported, but the SQLite driver is limited., but one can use the alternative in android.database.sqlite which are better integrated.
To conclude with, with Android you can reuse your java knowledge and tools.

Android Application Model, 11:30 – 12:20, by Dominik Gruntz

4 main components :activities, services, content providers and broadcast receivers.
A single class, uses intents to communicate with the other activities; when you launch an activity, you can (or not) expect a result; if this is the case, the method onIntentResult will be called.
You can also define intent filters to describe the intents an activity can handle.
An intent specification is on its way : http://www.openintents.org
An application is packaged using an APK (Android package).
Every activity has a lifecycle containing 4 steps : new, running, paused, stopped, killed and the corresponding methods (onCreate, onStop etc..)
For each activity a new process (with a single thread) is created.
The Looper.loop() dispathes the actions to a queue.
If an activity does not conume events in 5sec, the system issue a warning message.
A service is running background and can communicate with an activity (in process if it’s the same application (APK)) or via AIDL.
Finally, a content provider is the only way to share date between Android applications; it can using SQLite, a file, or a remote storage.

Scalable Agile Web Development: REST meets JCR meets OSGI, by Michael Marth

JCR : JSR 270 for accessing content repository : located on a file or database; can be versioned; node ahave read/write group properties, etc…
Apache Sling is a web framework, on top of REST/Scripting (Ruby, Groovy, etc…)/OSGi(in this case Apache Felix Container, to switch on/off part of the frameework live)/JCR.
So basically Apache Sling allows the user to create/edit/read/update content in a restful manner (http methods), the data being created is then stored on the JCR repository, organized in a very similar WebUrlFriendly way (and then you can manipulate the data through rest or webdav and so on, thanks to JCR)
The demo was really smooth and interesting !

The charm of Mockito: Test Spies in action, 14:30 – 15:20, by Szczepan Faber

The speaker begins asking who uses JMock : 2 or 3 people among an audience of 60 people, half of the audience using EasyMock.
So let’s start with EasyMock : coding in TDD a dictionnary, (and its history) depending on a translator : the translator is mocked.
With easymock the speaker keeps it old fadhioned : createMock/expect/replay/assert/verify , (his test extends Assert) and then refactor a bit in the @Before and @After test methods, nothing special here.
Then Mockito : mock/when/assert/verify : it’s a lighter syntax indeeed!
Szczepan insisted on the fact that usually developers using easymock create replayAll and verifyAll methods called in the @After method; which make Easymok fail when many behaviours are attached.
The speaker uses BDD style template (given/when/then) in eclipse, when creating a test.
Mockito eases the use of a given/when/then syntax when writing a test.
Has good point of failure ?
The failure trace in mockito is linked to the source code and more explicit about the error, it does not whow internal classes exceptions
Mockito or mockito-like for python, flex, javascript, C++; there are mockito extensions
He concluded with : « Do TDD and write great tests with whatever tools that work for you »
May the force be with you !

Eclipse Galileo and JBoss Tools, 16:30 – 16:50, by Max Andersen

Galileo (3.5) is a huge release.
Must-sees : Eclipse Memory Analyser (to see which plugin consumes all the memory for example), using jmap
XML and XSL editor is really better.
P2 (eclipse update manager) works for real; you shouldn’t use dropins anymore (single zip files to unpackage in /plugins and /features), for offline installation plugins providers should suggest copies of the update site, then you may use P2 to explore these files, as if you were online).

Danny Coward Keynote, 9:00 – 10:00

Java 7

Description of the new features in Java SE 7 : modularity, ?. operator, new API for java.io (Path, Asynchronous FileVisitor), http://openjdk.java.net/projects/jdk7

Java FX

The new version is 1.2, running on all OSes (even Linux and Solaris, a TV, some phones to come out), more UI components (skinnable with CSS) , new layouts, better performance; then Danny showed the audience some JavaFX applications : a pacman application, a video player, with some nice visual effects …

OSGi and Java Modularity, 10:30 – 11:20, by Peter Kriens

If you think your application is modular only by using the VM, well, think again…
You can’t hide interfaces in the classsloader, and if there are no enforcements of rules at runtime, it’s uselesse to try to make these interfaces secrets…
In OSGi, you can set secret interfaces (not exported) and also use MANIFESTs to explicitely specify exports.
With an OSGi bundle (a jar actually, with its MANIFEST), you can dynamically specify which others bundles it can depend on, if one of the bundle you depend on is no more available, OSGi will remove the dependency; then it will put it back when the bundle is available again.
The problem is : many implementations of modularity exist and JSR 294 do not specify a particular one … From a programmer point of view, you will have to choose between OSGi, Jigsaw, guice, the modularity implementation you want to use …

Next generation Wikis: Mixing Content-Oriented Applications with Wikis, 11:30 – 12:20, by Vincent Massol

Wiki 1.0 : just used for text
Wiki 2.0 : you can add everything : images, videos, comments, notes, etc.., the datas can be structured, unstructured or mashups (datas coming from everywhere) the wiki 2.0 is the excell… of the web !
After presenting a demo showing us the possibility in Xwiki to define in 10 minutes (knowing velocity or groovy syntax) an application hosted on the wiki, Vincent listed the Xwiki features and the new features to come : real time collaboration, mobile skin, social features and … merge of CMS and wikis.

JavaFX Rich Internet Applications connected to GlassFish Java EE 5 services, 16:00-16:20, by Ludovic Champenois – Sun Microsystems

First of all, Ludovic showed us the GlassFish v3 admin console (looks good !) and reminded us with REST (standard HTTP methods, resources, etc…), and the REST annotations in Java EE6.
Why ? because the example given during his demonstration is communicating with a JAX-RS Java EE6 application, hosted by Glassfish V3.
To test the REST application, you can simply use : curl -HAccept:application/xml http://localhost/domain, or use your browser or use Glassfish v3 Admin Backend Tester.
And then, down to the JavaFx application code, using Netbeans, only 15 lines of code are necessary to consume the REST service.
TO finish with, Ludovic showed us some other JavaFX demo applications.

JavaFX / Android: Competing technologies or the ideal partnership? , 16:30 – 16:50 by Mike Mannion and Andreas Hölzl

Presented as a theater play : 2 guys talking about phone technologies around a coffee : one is a JavaFX supporter, the other is an Android supporter.
They then compared a similar application (using Flickr, Lastfm, youtube web services): developed both for JavaFx and the Android Platform.
*UI : JavaFX needs UI designed by designers, Android defines it in an extermal layout XML file
*UI (2) : Android provides a richer API, providing a photo gallery for example, JavaFX does not…
*language : you have to learn JavaFX script for JavaFX, Android uses Java 5 API (with some restrictions…, for example it does not use AWT or Swing for graphics)
They also told us that Sun is not clearly decided about supporting Android : they said that they were thinking about it… but since then (a year ago) nothing came out !

James Gosling keynote : 9:50 to 10:45

First a nice little video from Java One, introducing the history of Java ! Very funny how Java conquered the world !
Then James Gosling begins his speech.
Today there are more JREs installed than people on earth ! It can be be smart cards, desktops, phones… 6M Java developers today in the world … 15M JRE downloads / week.
You can now view Java as « Learn One, Work everywhere » because it’s really spread everywhere now !
James Gosling then describes the brazilian healthcare, where every piece of paper is now on the network : prescriptions, x rays, everything is now on the network (thanks to Java !), ebay, metropolitan networks cards, web apps, games… Java is everywhere !
But the main thing is not java as the language, but the JVM that now hosts Ruby, Scala, JavaScript, etc…
James then showed us a bit of java code : a servlet for Java EE6 running on GlashFish v3, changed, saved and instantly shown just refreshing the browser ! No more deployment bottleneck !
He also introduced Netbeans, as the best IDE ! version 6.7 now integrates with project kenai, a sourceforge like (you can check in/out merge your files, etc… from Netbeans to kenai), also some better maven support.
Java is also used in the real time world, even in a car that James turns into electric : a lincoln (lincvolt.org) which is hybrid, connected to the internet, running java code for measurement and control.
Now down to the performance part : Java is highly optimized, genrally beats C/C++, GC is a lot faster than malloc/free !
Multithreading is the future of software designing : because the processors speed is not evolving anymore, we’ve got to think multicore !
Java is also running on cellphones, JSR 248, Mobile Service Architecture aggregates all Java mobile specs.
JDK7 will be modular (see Mark Reinhold’s blog), dynamic language support will be available too (JSR 292?); waiting for Java 7, there are still Java SE 6 updates : better browser and desktop integration are on their way !
Of course, we got a few slides about JavaFX, which can run on desktops, mobile phones, set top boxes, etc…
To finish his speech, James reminded us with all the java communities : netbeans.org, java.net, glassfish.org, etc…

Java EE 6 11:00 – 11:50 by Roberto Chinnici from Sun

Java EE6 was too complicated, so they decided to make it more easy to use, more powerful, and more flexible.
That’s why they created the profiles, letting the users choose the features they need.
For example the web profile includes everything for the web development, including the EJB 3.1 lite, and bean validation.

Servlet 3.0

New annotations @WebServlet, @WebFilter, @WebListener, the possibility to register new web components just adding them to WEB-INF/lib directory, a new async mode using just a single thread for many requests

JAX-RS 1.1 : RestFul webservices

This API is there to abstract low level HTTP details : using @GET and @POST (etc..) you can define your retrieval and creation REST operations, JAX-RS translates the XML to the java entities (and back) automatically for you (you can also use JSON)

Bean Validation 1.0 (JSR-303)

This API is here to validate fields (text inputs for example)
Seems to be really verbose just to define constraints… We’ll see…

EJB 3.1

No intefaces anymore ! One source file per bean.
New timer annotation @Schedule allowing some cron-like scheduling in the container : a great example provided is the case of a cache refreshing ! No more Mbeans called externally with crons, everything can be integrated in the application code !
EJB 3.1 lite can run on Java SE, great for testing and also in a war file !
Oups, we’re running out of time, the speaker skipped JPA 2.0

« Design Patterns » in Dynamic Languages 12:00 – 12:50 by Neal Ford from ThoughtWorks (nealford.com)

After comparing mixing dynamic languages with whisky blending, Neal Ford reminded us about the history of Design Patterns : basically for « making C++ code suck less » !
But the point is : the design pattern designed in 1994 are not always useful today : for example the iterator is quite complicated, whereas today in dynamic languages, like Ruby a collection.each{[x| puts x} is so much more… efficient !
Command design pattern is already built in closures !
The same for strategy, template, interpreter (the example showed how easy it is to implement a DSL in Groovy, defining new behaviors in the Integer class), decorator, recorder, adapter
Then Neal described some other desgn pattern for dynamic languages : the null pattern (?. in groovy) and the aridifier pattern.
To conclude with, Neal suggest that we should try the tools provided with the languages we’re using instead of blindly trying to copy the patterns designed for older, other languages !

Gradle : A build system for Java 14:00 – 14:50, by Hans Dockter

First the speaker reminds us of Ant and Maven.
With Ant, it’s always been repetitive, with a lot of copy and paste when a new project starts, due to Ant limited domain model (resources, target, properties,)
There is no place for listener in an Ant build…
A gradle script can import old ant build scripts.
With Gradle, you can call ant tasks, and even implement listeners on your ant task… An ant task called in a gradle scrip can even be aware of the next task that will be called !
Maven, on its side is a build by convention framework, which has introduced dependency management.
But Maven uses XML, and 25 lines of XML are required to launch a simple build !
Maven uses transitive dependency whereas Gradle is able to skip tasks (which can be handy when a Maven dependency is broken…)
Gradle aims to be a build language rather than a build framework; because when a framework does not implement a functionality, you spend your time fighting against the framework to make him do something it was not intended to do.
You can define your maven build with a groovy script using gradle.
With gradle, it becomes easy to define usually manual and entreprise specific tasks like release management or deployment.
Grandle can use Apache Ivy or Maven dependencies, it can even deploy a build to a maven repository.
There is also a Gradle Wrapper to start using Gradle without installing it : the Continuous integration machine will download Gradle for you and execute the gradle script (which is a shell script downloading gradle) !
What’s next? Gradle 1.0 will be out in Autumn.
Q&A :
What open source projects are already using Gradle ?
Grails, but others are to come.

Next Generation Enterprise Builds: Maven, Mercury, and Tycho (for OSGi builds) by Jason van Zyl from Sonatype

Maven 3.0

Better integration in IDEs, faster, rewritten artifact resolution system, etc…
Maven 3.0 is more focused on integration tests, provides a new version of the plugin manager, a queryable lifecycle to make the tools able to predict what’s going to be done and also able to ask to execute a particular step.
Maven 3.0 uses Mercury : a new repository and transport layer, that can be used with others systems (Ruby gems, Eclipse P2 dependency management)

M2eclipse

M2eclipse has also been improved, now m2eclipse won’t call every maven tasks on a a save action, it will only call the appropriate ones.
The m2eclipse team would like the users to be able to resolve every maven operations from Eclipse,
M2eclipse is now compatible with Flex (out by october 2009).

Nexus

Only 5% of the maven users use a repository manager.
Nexus is also for binary sharing inside the enterprise, it a repository manager, it’s like a source control management, but for binaries !
Nexus main advantage is also the caching system it provides.
Nexus can be queryed through m2eclipse, Nexus API can be used through REST, which makes it very easy to use.

Hudson

For its next version, hudson will integrate :d rools workflow integration (with a workflow editor), a rest layer to query hudson, unifying hudson m2eclipse, nexus better maven integration

Testing Zen 16:00 – 16:20 by Thomas Mueller, Day

In this session Thomas gave us the reasons why we should test our code.
Then he continued giving us an example of fuzz testing (data generation to test)
Code coverage (with Emma) to find untested and dead code.
Database testing is often hard : a pain to install… so you can use a Java SQL Database like HSQL (a good one), H2 (the best, and also the one the speaker is working on ! ) or Derby (the worse).

Creating Performance Test Data with benerator, by Volker Bergmann

Usually performance testers prefer testing with production data, but sometimes it is not possible (for privacy reasons or if the system is new).
In those cases, you have to use a data generator, like Benerator that can create and anonymize data, to DB, file, LDAP, JCR, etc…

To finish the day, we had a really nice speech from Neal Ford, about technology predictability, that was real fun !

• Lundi (si j’y suis): Glassfish
• Mardi : Java EE6, groovy, Spring 3.0, GWT, iphone, maven , mobile java
• Mercredi : hudson, securing ajax,jsf 2,mule, android
• Jeudi : android, rest, mockito, openjdk

çà va être épuisant je sens !
Trop hâte d’y être !