Java Inventor James Gosling Building Smart Marine Robots

From ACM TechNews:
Java Inventor James Gosling Building Smart Marine Robots
Network World
(11/27/12) Ellen Messmer

Java inventor James Gosling is using Java's security framework to design marine robots that can be sent across the ocean to gather weather data or carry out research projects. "I'm using all the crypto [application programming interfaces (APIs)] and the sandbox APIs and the Java DE [development environment] and NetBeans," Gosling says. He is helping design underwater robots that use satellite-based remote controls, as well as cellular signals when close to shore to cross the seas, sometimes for months at a time, to perform tasks such as the collection of weather data or the monitoring of pollution levels. One of the robots is being designed to be more aware about its environment so it can navigate more on its own without remote control or preprogramming. Gosling also notes that work is underway to optimize communications since satellite use can be costly and bandwidth-intensive. "It's all Java code, a new generation of robots that's all Java on the inside," he says. Although the original Java programming language has expanded its security structure over the years, it adheres to its basic principle of the security sandbox set of rules to battle hostile code and offer solutions to implement public-key infrastructure, authentication, and access control mechanisms.

View Full Article
http://www.networkworld.com/news/2012/112712-gosling-264555.html

Checkout sub directories in git (sparse checkouts)

//TODO en Français

SVN externals is a really nice feature I used a lot. Switching to git I was really missing it. Of course there is git-submodule but it’s not the same. Now, with version 1.7 git supports so called sparse checkouts which allow you to only include specific sub directories of a repository in your project. You still need to clone the whole repository, but afterwards you can tell git to only show the specified sub directories.

Here is how it works:

1. clone the other repository (in my case, for a Rails app, I did it in vendor/plugins/)

   git clone <repository_url> <directory>

2. cd to <directory>

   cd <directory>

3. enable sparsecheckout

   git config core.sparsecheckout true

4. add directories you want to have in your checkout to .git/info/sparse-checkout, e.g.

   echo app/models/ > .git/info/sparse-checkout
   echo lib/ >> .git/info/sparse-checkout

5. run read-tree

   git read-tree -m -u HEAD

ls now shows

app lib

Forgot a directory you wanted to include? Just repeat step 4 and 5.

Demarche recommendée pour tâches dans LJUG et les sous projets

La forge LJUG et les sous groupes de ljug tel que "Entreprise Environement" hébergés par java.net. Nous permet de communiquer et de demander que certaines tâches soient réalisées par un autre membre du groupe.

Pré-requi être membre du goupe rejoindre l'un des projets de la LJUG (http://java.net/projects/ljuginfrastructure/watch ou http://java.net/projects/ljug/watch)

Action: Créer une "tâche" dans "suivi des problèmes" représentant votre requête ou votre soucis

Résultat: Attendre et suivre que la tâche soit résolu, Les tâche sont classé par nombre de vote!

Par exemple dans ljug : http://java.net/jira/browse/LJUGINFRASTRUCTURE
et dans ljuginfrastructure : http://java.net/jira/browse/LJUG

Bien sûre tous ces liens sont disponibles sur les pages principales des projets dans java.net

Why join Lebanese Java User Group

Version française visitez "Lebanese Java User Group à L'ISAE Cnam Liban"

Groupe Utilsateurs Java : Liban

At Cnam Liban university (computer science and software engineerinf departement) students will have to deals in most of their courses with Java technologies. Cnam Liban was an early adopter of java technologies in official syllabus and curiculas

It was decided to create a Java User Group on java.net forge, we call it the  "Lebanese Java User Group" this Java User Group will have at least 3 goals:

• Portal to all supports and materials concerning  (javacard, javamobile, j2se, j2ee, Android, and others ...)
• Repository of all documents related to Java published by Teachers, students and members
• Repository of programms and code for meanfull projects produced by  members of the "Lebanese Java User Group"

LJUG is a Java User Groups (JUGs)

Java User Groups (JUGs) are volunteer organizations that strive to distribute Java-related knowledge around the world. They provide a meeting place for Java users to get information, share resources and solutions, increase networking, expand Java Technology expertise, and above all, have fun. Take a look at the JUGs Community Objectives, to learn how your JUG can benefit from participation in this community!

Joining and Getting More Involved in LJUG Projects

If you want to get involved with LJUG project, you can do a couple of things.

• You can click the Bookmark link on LJUG home page and instantly get an Observer role. This will add the project and its forum information to your MyPage.
• If you want to get more involved, start connecting with other members of the project in that project's forums or mailing lists, and get to know how the project is being worked or managed. Once you get to know everyone, try asking one of the project administrators for a higher role in the project like Software Developer, tester or Content Developer.

Possible Roles

Role	Description
Administrator	The Big Cheese, Head Honcho, King of the Mountain. Owns the project and can do anything they like with it.
Software Developer	Top level developer. Do what ever you want with the code.
Tester	Tests the project software to make sure it works. AKA quality assurance (QA) person.
Content Developer	Second level developer. We trust you, but not that much
Observer	You are here to watch, comment, and connect.

Generate public/private ssh key for java.net and git use on Windows with putty

Setting up PuTTY and Generating a Key

You can use the free program PuTTY to create an SSH key. To manage and access the key, you'll probably want to download Pageant and Plink as well. You can get them all at PuTTY Download Page.

After installing PuTTY, make sure the install path has been added to your PATH environment variable.

PuTTY comes with excellent documentation on what SSH is and how to generate a key with PuTTYgen. Here are some short instructions:

1. Start PuTTYgen by clicking Start > All Programs > PuTTY > PuTTYgen.
2. At the bottom of the window, click SSH-2 RSA to generate the most secure kind of key. Project Kenai requires an SSH-2 key.
3. Click Generate and move the mouse around until the key starts generating.
4. When the key is generated, you see the public key listed in the Public Key for Pasting box at the top of the window.
5. Optionally enter a passphrase for the key, which makes it more secure on your machine.
6. Click Save public key and save it in a file in your user directory. For example, you might save it in
   C:\Documents and Settings\your-user-name\.ssh\puttypublickey-ssh2rsa
   Note: You can use the Command window to see what your user directory is. On the command line, enter echo %USERPROFILE%.
7. Click Save private key to save the private key to a file in the same directory as your public key. For example, you might save it in 
   C:\Documents and Settings\your-user-name\.ssh\puttyprivatekey-ssh2rsa.ppk
8. Keep PuTTYgen open so you can copy and paste your public key to your Project Kenai account. (See next section.)

Copying the Public Key to Project java.net

The public key that you see in the Public Key for Pasting box in PuTTYgen needs to be added to your SSH Keys tab in your Project Kenai public profile. To add the key:

1. In a browser, log in to Project Kenai.
2. If necessary, open your My Page.
3. Click Edit My Profile in the left navbar.
4. On the My Profile edit page, click the SSH Keys tab.
5. Copy the public key from PuTTYgen and then follow the instructions at Adding an SSH Key to Your Profile.

New Java User Group

A new Java User Group is created at Cnam Liban

It is mainly hosted on java.net at http://java.net/projects/ljug/pages/Home

It still incubating

To join create a java.net account and send me an email with the username and motivation at ljug@cofares.net

This blog will be a complement for essential news about LJUG