Tau dari mana Sukses :D

Yup dari data download eMovieRental yang ada di Box.net

Saat tulisan ini dibuat download eMovieRental udah lebih dari 4700 download :D

Agak kurang percaya juga sich :

Diatas itu screen shoot statistik download. Padahal itu diupload tanggal 14 Juli sedangkan sekarang baru akhir Agustus. Hmm baru hampir 2 bulang, ternyata statistik downloadnya bener-bener gede :D

Kembali ke topik!

Sekarang saya buat sebuah aplikasi yang bernama ePhoneBook. Aplikasi ini merupakan aplikasi PhoneBook menggunakan Java. Jadi aplikasi ini gak sekomplek eMovieRental.

Jadi kalo anda gak akan terlalu pusing buat memahami alur program yang saya buat ini :D

Kalo udah penasaran, silahkan download projectnya disini :

http://www.box.net/shared/vcdejnh1so 

untuk penggunaannya hampir sama dengan eMovieRental

Semoga Berguna

:D

El diseño queda a disposicion de ustedes, ahora hay un sin fin de herramientas que permiten realizar este tipo de trabajo, esto es solo para uso didactico. obviamente esta tabla de logueo lo mantendremos dentro de un "form" dado que utilizaremos el metodo POST y en el action colocaremos el Servlet al cual llamaremos "GeneraSession".

Una vez hecho esto, creamos el archivo "principal.jsp" el cual nos servira para mostrar el resultado luego de realizar el logueo.

Luego creamos nuestra clase que actuara como servlet. Hacemos click derecho sobre nuestro proyecto y elejimos New --> Servlet, le damos el nombre (GeneraSession.java) y se nos mostrara un cuadro en donde nos dice que este nombre del servlet sera añadido al archivo de configuración "web.xml" el cual servira para poder ubicarlo y luego le damos click en terminar

Una vez hecho esto solo quedaria agregar el codigo dentro del metodo "processRequest", quedando algo como esto:

Podemos observar que estamos obteniendo los datos del formulario mediante el request para ser validado y asi poder generar la sesion, para luego enviarnos a la pagina principal. Ahora esto no quedaria alli; en la pagina "principal.jsp" que ha sido creada tendriamos que realizar tambien la validacion de la sesion, dado que como sabemos las sesiones tienen un tiempo de vida, si sobrepasa este tiempo la sesion automaticamente se destruye (a no ser que personalize el tiempo de vida), entonces en la pagina "principal.jsp" tendriamos algo como esto:

De esta forma validamos si la sesion persite, en caso contrario te enviaria a la pagina de inicio para volver ha realizar el logueo.

Como veran es una forma practica de trabajar con sesiones mediante un servlet; obviamente esto tendria que mejorarse, pero esto puede ser un punto de partida para muchos.

Przy okazji lista najbardziej użytecznych rzeczy do rails:

1. netbeans (na linuchu amd64 jest problem z maszyną wirtualną javy -> rozwiązanie tutaj), z debuggerem (na linuchu jest również problem -> rozwiązanie tutaj
2. rails  api docs
3. tutorial wymieniony powyżej

Hmm.. setelah anda mengetahui cara download dan menginstall java + netbeans pada tulisan sebelumnya, sekarang anda bersiap-siap untuk memulai membuat program Hello World, Java pertama kali. Buat project baru dengan mengikuti langkah-langkah di bawah ini:

1. Pada menu IDE netbeans, pilih menu File -> New Project.
2. Pada jendela New Project, pilih Java pada kotak Categories, dan pilih Java Application pada kotak Projects. Klik tombol Next.
3. Ketikkan nama "Tutorials" pada kotak Project Name, dan sesuaikan lokasi project anda pada kotak Project Location dan project Folder.
4. Hilangkan tanda centang pada pilihan Create Main Class dan Set As Main Project. Dan klik tombol Finish.
5. Kemudian klik kanan pada jendela Projects, dan pilih New -> Java Class.
6. Ketikkan "HelloWorld" pada kotak Class Name, dan klik tombol Finish.
7. Selanjutnya, anda bisa mengetikkan kode program berikut ini:

   public class HelloWorld {   
       public static void main(String[] args){
           System.out.println("Hallo Dunia!\n"); 
       }
   }

8. Kemudian tekan tombol Shift+F6 untuk mengkompile.
9. Hasilnya bisa anda lihat pada jendela Output, atau bisa juga anda masuk ke terminal, masuk pada lokasi project anda, misalnya : "/home/dedygunanto/NetBeansProjects/Tutorial/build/classes". Dan ketikkan pada perintah

   shell > java HelloWorld

10. Hasilnya bisa anda lihat pada gambar di bawah ini:
11. Selesai.

Wassalamu'alaikum Wr.Wb.

Untuk anda yang ingin belajar tentang Java dan Netbeans, dan anda bingung belum tau bagaimana cara awal memulainya, berikut ini adalah tulisan untuk memulai dari awal semuanya. Sebagai catatan (Penulis menggunakan sistem operasi Ubuntu 8.04 Hardy Heron):

1. Download dahulu Java Compiler (jdk_6u7_linux.bin)  atau jika anda tidak ingin pusing, silakan download jdk+netbeans dalam satu paket, Misalnya: jdk-6u7-nb-6_1-linux-ml.sh untuk Linux di situs http://java.sun.com/javase/downloads/index.jsp
2. Setelah selesai anda download, sekarang persiapan untuk menginstall nya.
3. Masuk ke terminal, dan kemudian masuk ke folder tempat anda meletakkan hasil download anda.
4. Ketikkan perintah :

   shell > ls -l

   untuk mengetahui nama jelas dan atribut dari file jdk anda. Kemudian ubah modenya agar bisa di eksekusi:

   shell > chmod +x jdk-6u7-nb-6_1-linux-ml.sh

5. Selanjutnya adalah menjalankan installer tersebut, dengan mengetikkan perintah:

   shell > sudo sh jdk-6u7-nb-6_1-linux-ml.sh 
   [sudo] password for user: 
   Configuring the installer...
   Searching for JVM on the system...
   Preparing bundled JVM ...
   .....

6. Ikuti perintah dari installer tersebut. Dan selesai.
7. Untuk membuka netbeans anda, silakan anda menuju menu Aplikasi -> Pemrograman -> Netbeans [Versi punya anda], Ini contoh dari layar Netbeans punya saya.

   

8. Selesai, Moga bermanfaat.

Wassalamu'alaikum Wr.Wb.

Now, because of my new venture, and after brainstorming new product ideas, I decided to have a mobile side to this service (by the way, my new venture has yet to go live, as I am experiencing technical difficulties). Of course, in order to go mobile in the programming world means learning the mobile development techniques of Symbian, Android, iPhone OS, Windows Mobile, or, of course, if you want to target most of them, Java.

Why I chose to learn Java is also because, with this language, I'll be able to (hopefully) write cross-platform ports of my current programs, which are right now tied-down to the Windows platform, because they use the .NET Framework.

The Simplicity of Java

I have started out from the beginning in a Java book I bought two years ago (Getting Started in Java by Owen Bishop - Babani Books), with the famous "Hello World" program.

When I first started with Java (and then gave it up for C#) two years ago, I found it a bit difficult to grasp the language, as I was coming from a strong Visual Basic background. But now, after becoming quite proficcient in C#, I have found it quite cool to write in Java, since the two share a very similar syntax.

Tools

At the moment, I'm using an IDE called JCreator for writing, compiling and running Java apps that I write. It resembles Visual Studio strikingly (with the exception of a GUI designer), and is great for helping me learn the langauge. It has syntax highlighting, automatic insertion of braces, and an overall clean UI.

However, I have been checking the Netbeans site out recently, and am amazed at how far they've gone from when I first attempted Java. I will be downloading the new Netbeans IDE with Mobility Pack, as this has GUI design - something I'm in great need of right now concerning Java! ;)

Alright, back to Java coding and then... research and prep for tomorrow's CTAs...

There is code templates for PHP language, I tried to search on Internet for the code templates lists but I can't found anything that can helped. It will really helpful if we have a cheat sheet for that.

So I listed the code templates here. Maybe someone will found it helpful.

]]> http://maleskoding.wordpress.com/?p=68 Tue, 07 Oct 2008 14:06:02 +0000 petra http://maleskoding.fr.wordpress.com/2008/10/07/iniparser-memparsing-file-dengan-ekstensi-ini/ INI file adalah sebuah format file yang digunakan untuk menampung konfigurasi. Ekstensi INI berasal dari kata "initialization". Biasanya memang digunakan untuk menampung konfigurasi inisialisasi dari sebuah aplikasi.

Format datanya adalah seperti ini

[section]
name = value ; comment

Untuk mengolah file seperti ini pada lingkungan pemrograman C, sudah terdapat banyak library yang dapat digunakan untuk melakukan parsing, mengedit, serta mengambil dan mengeset nilai pada file tersebut. Salah satu dari library tersebut adalah iniParser. Library sangat baik untuk digunakan karena cukup lengkap dan simpel.

Supaya dapat menggunakannya source code dapat langsung didownload dari situsnya. Kemudian tinggal mengeksekusi perintah "Make" pada terminal. (Pastikan sudah ada gcc dan libc6-dev). Pengeksekusian ini akan menghasilkan sebuah file yakni libiniparser.a yakni sebuah static library yang telah berisi fungsi-fungsi yang dapat digunakan.
Kali ini lagi-lagi untuk memudahkan akan digunakan pada IDE Netbeans.

1. Copy file dictionary.h dan iniparser.h ke folder projectnya secara manual.
2. Kemudian klik kanan pada virtual folder Header Files pada Window Projectnya lalu pilih Add Existings Items... Kemudian pilih dictionary.h dan iniparser.h serta set store path sebagai relative. Ini akan memudahkan jika nanti projectnya akan dikerjakan di lain tempat.
3. Copy file libiniparser.a ke direktori project secara manual. Lebih baik jika dibuatkan sebuah sub folder "lib"
4. Klik kanan pada projectnya kemudian pilih Properties.
5. Pilih bagian Linker, dan kemudian pilih pada bagian Libraries.
6. Pilih Add Library File, dan kemudian pilih file libiniparser.a yang tadi telah diadd. Pathnya diset ke relative.

Untuk mencobanya, kita buat sebuah file ini. Isinya

[section1]
nama1 = data3 ; ini komentar
nama3 = data2 ; ini komentar juga

[section3]
nama1 = data1
nama2 = data2

Kemudian kita simpan ke /tmp/config1.ini

[sourcecode language="c"]
#include
#include
#include "dictionary.h"
#include "iniparser.h"

int main(int argc, char** argv) {
    dictionary * config;
    config = iniparser_load("/tmp/config1.ini");
    char * nama1 = iniparser_getstring(config, "section1:nama1", "halo2");
    printf("%s\n", nama1);
    return (EXIT_SUCCESS);
}
[/sourcecode]

Fungsi iniparser_load berguna untuk membuka file yang dipilih (/tmp/config1.ini) dan menyimpan handlenya ke pointer config.
Kemudian nilai-nilai yang disimpan dapat diambil dengan menggunakan fungsi iniparser_getstring atau fungsi lain seperti iniparser_getint dengan menyebutkan section serta nama dari nilai yang ingin diambil.

Aplikasi dapat langsung dijalankan dan dilihat hasilnya.

Sebagai contoh kemudahannya adalah saat gw ingin menggunakan MySQL C API untuk aplikasi yang sedang gw kembangkan. Tahap-tahapnya adalah

1. Instalasi libmysqlclient.
   Caranya sangat mudah. Untuk Ubuntu tinggal ketik pada terminal

   #sudo apt-get install libmysqlclient15-dev

2. Include header mysql.
   Tinggal mengetikkan [sourcecode language="c"]
   #include
   [/sourcecode]

   Dapat dilihat fitur intellisense pada Netbeans langsung bekerja.
   

3. Tambahkan library libmysql pada linker.
   Tanpa melakukan ini fungsi-fungsi yang akan digunakan tidak dapat dilink. Caranya adalah klik kanan pada project yang sedang dikerjakan, pilih Properties. Kemudian pilih menu Linker > Libraries. Pilih Add Library. Kemudian masukkan /usr/lib/libmysqlclient.a
4. Setelah itu penulisan kode dapat dengan mudah dilakukan karena ada fitur intellisense.
   

   Dan pembangunnya juga dapat tinggal dilakukan dengan fungsi Build pada Netbeans.

Gampang jadinya ^_^

Referensi lebih lengkap mengenai fungsi-fungsi yang disediakan, ada pada dokumentasi resmi MySQL C API di sini

Para minha surpresa, ao istalar a última versão do Netbeans, mesmo tendo escolhido o idioma inglês na hora de baixar, ele "pegou" o idioma padrão de meu sistema (Português) e definiu que a IDE estaria em português... Vai entender...

Após muito apanhar, finalmente encontrei uma forma de trocar o idioma da IDE Netbeans para o português, e gostaria de compartilhar isso aqui:

Com o Netbeans fechado,

1) Acesse o diretório /etc (ou \etc se estiver no Windows. Você precisa ter permissões de leitura e escrita (ou Controle Total) na pasta - e nas subpastas - do Netbeans

2) Abra o arquivo netbeans.conf

3) Procure pela linha que termina com useScreenMenuBar=true

4) Ao final desta linha, acrescente (exatamente desse jeito):

-J-Duser.language=en -J-Duser.region=US

5) Salve o arquivo e... finito!

Agora abra o Netbeans e comprove. ;-)

A different way of starting the IDE

Geertjan once blogged this entry, and said, "Drag and drop a desktop icon of a file onto the NetBeans desktop icon......and the IDE will start up, with the specified file open in the editor. That's always been possible, but is [as far as I am aware] completely unknown."

There are several such observations, which could be made, but it generally happens accidentally :P

Opening Projects..

Now, there are two ways of opening projects (created/maintained locally), that I have seen.

General way- Browsing from Inside

Firstly, you know that one has to go to "File > Open Project.." OR, use a shortcut key- "Ctrl+Shift+O"

Then, you browse to the location of the project and then you "Open" it in the IDE.

New way- Without Internal Browsing

Now, what you can do? Whether NetBeans IDE is running or not, it doesn't matter, just use your system file browser which is faster than the IDE, and locate your project root.

Drag-n-Drop the folder over NetBeans Desktop Icon, if its not running, OR Drag-n-Drop it over NetBeans running instance. It will take some time, and project would be opened, that too as Main Project, by default.

What you have to do?

Execute this trick and comment, if you like. Also, if you have some of the tricks to share, which makes life easier for users, share it with NetBeans Community through NetBeans Community Docs Program! Another thing, if you're not a blogger and want to share similar DnD discoveries with the community, you can mail me - nvarun AT netbeans DOT org

So, that I can blog about your discoveries, and contribute them to the above documentation project as well.

Have a good day :)

Simply:
1. Download MySQL 5.1 Community Edition and GlassFish v2 Update Release 2 (UR2).
2. Develop a cool web application using the combination.
3. Create a project of your application at java.net.
4. Write a review of these products and post it in your blog.
5. Submit your java.net project's URL and your review's URL.
6. Do it before October 22, 2008.

How to Enter

To participate, do the following:
1. Develop an innovative web application that uses MySQL 5.1 Community Edition database and GlassFish v2 UR2 application server. You can develop in any of the following languages: Java, PHP, Python, or Ruby. You must submit complete source code of the application, user documentation, developer/administrator documentation including application installation instructions, and appropriate executables. You must make all these deliverables available as a project at java.net. Provide your project's URL in the Submission Form below.

2. Write reviews of MySQL 5.1 Community Edition database and GlassFish v2 UR2 application server based on your experiences as you developed the web application. You must post the review in a blog or on a web page, and you must provide the corresponding URL in the Submission Form below.

The developed application and the reviews must be new material that you have written and not copied from something that you or others have already developed or published.

Finally, complete the submission form, and if you have any questions, submit a contact request.

Deadline
Contest starts: September 2, 2008
Submission deadline: October 22, 2008
Judging period: October 23 - November 20, 2008

Winners announced: November 21, 2008

For more information please look at here

W Javie mamy osławiony JUnit, framework do tworzenia testów jednostkowych, o których nota bene książka czeka w kolejce na przeczytanie. Jednakże na szybko należy wspomnieć o innym ciekawym rozwiązaniu, które w praktyce jest dla programistów całkiem miłym ułatwieniem. Konkretnie chodzi o asercje. Mówiąc krótko jest to taki warunek logiczny, którego niespełnienie (fałsz) powoduje przerwanie wykonywania programu. Jest to element języka, zatem nie trzeba od razu zatrudniać całej machiny testów jednostkowych, wystarczy wklepać w kod raptem jedną linijkę. Oto przykład:


public static void main(String[] args) { int licznik = 2;
int dzielnik = 0; // To jest zabronione
int wynik;
assert dzielnik != 0 : "Ty no nie dzieli się przez zero";
wynik = licznik/dzielnik; }


Oczywiście przykład jest bardzo prosty i ostry, w normalnych warunkach bez składni assert wyrzucony zostałby  ArithmeticException. Jednakże w tym przypadku zostanie uprzednio zgłoszony wyjątek AssertionError wraz z komunikatem, który podaliśmy zaraz po warunku. Niby nic, a jednak wiele - jakie są zyski z używania asercji?

Zasadniczo to dwa. Pierwszy jest taki, że wyrzucanie wyjątków asercji jest domyślnie wyłaczone!!! By uruchomić tę opcję należy wywoływać kompilator z parametrem -ea. W NetBeans wystarczy kliknąć prawym przyciskiem myszy na projekcie i Set Configuration->customize. I w okienku uruchomieniowym w rubryce VMOptions wpisać owo -ea.  Od tej pory przy kompilacji asercje będą brane pod uwagę. Jest to o tyle dobre, że dzięki jednej opcji, można bez problemu w ciągu jednej chwili przestawić aplikację ze stanu docelowego na developerski. Nie trzeba zakomentowywać masy kodu, wystarczy zmienić argument wywołania VM.

Drugim plusem jest informacja dla innych (poważne projekty to raczej nie domena 1 osoby) o założeniach dotyczących danego fragmentu kodu. Oczywiście na podanym przeze mnie przykładzie tego może i nie widać, za to przy dużych projektach, kiedy zależności między klasami zaczynają przypominać labirynt asercje pokazują swoją przydatność. O wiele łatwiej jest przeczytać w kodzie (lub wyniku kompilacji) "Kierowniku tutaj nie powinno być NULL", niż przedzierać się przez gąszcz plików w poszukiwaniu klasy, z której pochodzi feralna metoda powodująca wyrzucenie wyjątku. Mała rzecz, a cieszy.

Luego de hacer click en "Close 6 Projects", estos se esfumaron ante mis ojos en un santiamen... si ya sé, necesito dormir :p

I found out that the distribution was 50, 88, and 62 (respectively)- summing up to 200 docs. So, it was 62 in 3 months ;) Well, few days back, i.e. on Sep 30, 2008- Total contributions were 226.

88 again, 12 to go!

That means 26 in 2 months- summing up 62 and 26, we get 88 docs! If you remember, when Amit left the coordinator position, same no. of docs were contributed under him. Don't worry.. I am not leaving right now.. Its still a long way to go, I hope so!

However, that also means, I need 12 more contributions to make a century here as well. What say? Are you ready to contribute?

Many bloggers are invited and are in progress of writing it, they would soon be out with their documentations. You can also make a difference by contributing a documentation...

So, please do join us and contribute!

setLocationRelativeTo(null); 

Aconselho utilizar o NetBeans para aplicações gráficas no Java.

The other side is: you have to learn a lot of exceptions to common stuff that you already learned in another languages (In my case Java).

So today I will explain things where it took me a lot of time to understand how to do this and what ruby (and rails) does. Let us start with the very basics: installation and then the pure ruby language.

Setup MySql

If you use debian as OS it is quite simple to install mysql:

sudo apt-get install mysql-server

Then create a database with the following lines

mysql -u root -p
type the following in the mysql shell:

CREATE DATABASE mydb;
GRANT ALL PRIVILEGES ON mydb.* TO 'admin'@'localhost' IDENTIFIED BY 'admin' WITH GRANT OPTION;
FLUSH PRIVILEGES;
quit;


Later on you can log into the mysql database via
mysql -u admin -p
[now type the password 'admin']

SHOW TABLES FROM mydb;

I suggest you to use http://www.squirrelsql.org/ to view and even manipulate the database. The nice thing about this java program is: you can simply install the jdbc drivers for your database (e.g sqlite or mysql) and after configuring them you can browse the databases in a nice way!

Install Ruby and Rails

To be independend from Java or if you don't want to use JRuby you have to install ruby on your machine:

sudo apt-get install ruby libzlib-ruby rdoc irb

Now install gems ...

sudo apt-get install rubygems
sudo gem install mysql

... and rails

sudo apt-get install rails

Create a Skeleton Application

Optionally install NetBeans 6.1 (and Java >1.5 before) to get some handy functionality.

Be sure that you choose a package with rails or install the rails plugins via: Tools->Plugins.

Now you should able to create a rails application: New Project->Ruby On Rails Application. Click Next and choose your ruby system. (Or do 'rails testapp' on the command line).

You will get a list of created files. To quickly navigate to a file in NetBeans press ALT+SHIFT+O (Oh not zero) and type in the name. Now I will go through some of the generated files:

app/controllers/application.rb

This is the base class for all of our controllers. To study the Model-View-Controller pattern visit wikipedia. In our controllers we put in all of our application logic. For example the password encryption when one of our user logs in.

app/helpers/application_helper.rb

In this helper modul we define some convinient methods for our view

test/test_helper.rb

With this class it is easy to test the implemented (helper) methods. Read "Agile Web Development with Rails" to be surprised that unit and even integration tests are very easy (and fast) to write.
config/database.yml
The generated content looks like:
development:
# your database server:
adapter: mysql
encoding: utf8
database: mydb
username: admin
password: admin
timeout: 5000
# necessary if you are on debian:
socket: /var/run/mysqld/mysqld.sock
...
config/routes.rb
Here you will define later more fine grained navigation rules for the pages of your web application.

In NetBeans (with rails of course) database-migrating is very easy: right click the project->Migrate Database->To [misc] Version or Clear...

Start the web server with F6 in NetBeans or type

ruby script\server

Then go to http://localhost:3000/ with your browser and you should see ruby's welcome page.

Now we want to replace the index.html with an erb (like jsp) file. To do this we will remove the public/index.html file and do

script/generate controller home index

add the following to the routes.rb

map.home '', :controller => 'home', :action => 'index'

To add some more functionality to our rails application there are a lot of plugins available. One of them is the restful_authentication, where a tutorial plugin (or here) exists which itself references to a bunch of other useful plugins. Check them out!.

Now some comments on setting up the restful_authentication plugin: Add the following resource to your repositories if you need this plugin (and others from the author):

script/plugin source http://svn.techno-weenie.net/projects/plugins/script/plugin install restful_authentication

or simply do

script/plugin install http://svn.techno-weenie.net/projects/plugins/restful_authentication/

On my machine it took a lot of time and finished with an timeout error so I did:

sudo apt-get install git-corecd vendor/plugin && git clone git://github.com/activefx/restful_authentication.gitmv restful-authentication/ restful_authentication/ && cd ../..

Now generate the necessary classes:

script/generate authenticated user sessions --include-activation --stateful

My (unsorted) Comments

Try getting started with rails and come back here to read the following comments (or post your own!) if you figured out sth. worth enough to be said for beginners.

1. For restful_authentication:
   Be sure that you ignore the config/initializers/site_keys.rb in your subversion!! But save it, because you will need it for your application!
2. If need a login snippet like the one from the authentication tutorial:
   app/views/users/_user_bar.html.erb in your start up weü page app/views/home/index.html.erb
   Use the following line:
   <%= render(:partial => "users/user_bar") %>
3. If you need ssh2 try:
   # require 'digest/sha1'
   require 'digest/sha2'
   def User.mydigest(str)
   Digest::SHA256.digest(str)
   #Digest::SHA1.hexdigest(str)
   end
4. What the hell is this string with a colon? I mean the ':password' here:
   update_attributes :password => 'secure'
   It is called symbol and is the name of a variable e.g. of a class. Where 'secure' is the value of the variable password. So with this method call e.g. within the User class you do password = 'secure'.
   Example:
   var = { 'a' => 'b', 1 => 'c'}
   assert_equals('b', var['a'])
5. And what is the :password => 'secure' statement?
   This is a key => value expression without the {} braces of the hash (Map in Java) , which are optional if the hash is the last parameter. This is very handy if you have several properties to set.
6. What is 'self'? It depends! Read more about self here!
   • global variables begins with @@
   • object variables begins with an @ (All the instance methods of a class can access this variable. So every object has its own set of object variables.)
   • local variable begins with a lower case character (except 'self')
   • constant variables begins with an upper case character (except ':symbol')

   Warning: if you don't add self in front of you object variables, ruby assumes that they are local!?

7. What is attr_accessor :name? This will create a getter and a setter for the variable 'name'.
   Or define a setter manually (via operator overloading)
   def volume=(vol)
   leftChannel = self.rightChannel = vol
   end
8. Where is the constructor of User? Do
   user = User.new
9. escape html in the view via h(user_input).
   For more security related stuff look here, here and here.
10. The following line is not always secure ('mass assignment')
    User.new(params[:user])
    To make it secure do:
    attr_accessible :name
    Now only the variable name can be change via url parameters.
11. The following statement is unsecure
    User.find(:all, :conditions => ["name like '%#{params[:query]}%'"])
    Use
    :conditions => "name like ?", '%' + params[:query] + '%'
12. add filter_parameter_logging :password to application.rb
    => all fields with names like "password" will get [FILTERED] in the logs
13. Rails add a very handy method to objects:
    o.blank?
    An object is blank if it‘s false, empty, or a whitespace string. For example, "", " ", nil, [], and {} are blank. Taken from here.
14. There is no counter++
    Use counter += 1
15. Swapping variables:
    a, b = b, a
    This work in methods too! E.g. return a pair of variables via
    def meth
    return a, b
    end
    Now call the method
    b, a = meth
16. if sugar - 'the other wayround'
    puts 'hello world' if str == 'name'
17. defined? var
    will return true if there is a field named var
18. You can use 'hello' or "hello"
    The only difference for those strings is the expression evaluation like "#{var}"
    This will work only in ""
19. comments are like in bash: #
    Or use this to comment several lines:
    =begin
    here is comment
    here too. WARING: =begin and =end has to be the first characters on the lines!
    =end
20. Default values for method parameters via
    def meth(param='test')
    end
21. def see_how_to_throw
    begin
    # Do something nifty
    raise SomeError, "This is the error message!"
    rescue SomeError
    # This is executed when a SomeError exception is raised
    # to rethrow do
    # raise $!
    rescue AnotherError => error
    # Here, the exception object is referenced from the
    # `error' variable
    else
    # This is executed only if no exceptions were raised
    ensure
    # This is always executed, exception or not
    end
    end
22. A very useful tool for testing is autotest:
    gem install ZenTest
23. It is eays to test with rails! Very easy to write unit and functional testing of your controllers and the pages.
    In NetBeans press ALT+F6 to start them.
24. use %{ } for xml strings directly unescaped in the code! Very handy.
25. Time sugar:
    3.minutes + 3.hours
    returns the result in seconds! Much more ...
26. counter ||= 0
    This statement will only be executed if counter is nil. Useful for singletons you think? Use self for this!
27. Unicode support is not that good. Use Chars instead of the built in String class. Or convert to Chars before working with strings.
28. Why are there named routes in routes.rb?
    These routes are accessible from the view. E.g. the following line is a named route (map.hello instead of map.resource)
    map.hello '/fhello', :controller => 'users', :action => 'hello'
    So the method hello will be invoke if the user click the link in the view which is generated via <%=hello_url%>
    One special name 'map.resources' indicates that rails should create 7 standard routes (4 of them are the CRUD methods). For example map.resources :articles will create the following routes:
    /articles (GET=>shows all, POST=>create a new)
    /articles/new (shows html for new article)
    /articles/1 (GET=>shows the first article, PUT=>update, DELETE=>deletes the article)
    /articles/1;edit
29. parsing invalid xml with require 'rubygems' and require 'rubyful_soup'. Then do:
    xml_data = Net::HTTP.get_response(URI.parse(url)).body
    doc = BeautifulSoup.new(xml_data)

Netbeans is AMAZING at creating web services, the tools are incredibly rich.

But this error dogged me. I had one or two web services that worked and others that didn't. To set up my service I had set up some inner classes

public static class dtaData {
private String Name;
private String date;
private String sid;
}

then created a web services that returned a LIST of those objects:-

    @WebMethod(operationName = "Data")
    public List Data() {
        List result=new ArrayList();
       for (int i=0;i<20;++i) {
        dtaData DataObject=new dtaData ();
       DataObject.sid=""+i;
       result.add(Result);
     }

        
        return result;
    }
  

And it falls over with this error when you test the webserver. HOWEVER The problem is caused because there is no web service DIRECTLY returning the dtaData class. The solution is to create a web service that returns null but has dtaData as the returning Object.

e.g.

    @WebMethod(operationName = "testData")
    public dtaData testData() {
           return null;

    }
   

These errors are given when the problem occurs:-

On the glassfish server

Caused by: javax.xml.ws.WebServiceException: javax.xml.bind.MarshalException
 - with linked exception:
[javax.xml.bind.JAXBException: class PHJ.Agenda$ICDB_Agenda_data nor any of its super class is known to this context.]
        at com.sun.xml.ws.message.jaxb.JAXBMessage.writePayloadTo(JAXBMessage.java:322)
        at com.sun.xml.ws.message.AbstractMessageImpl.writeTo(AbstractMessageImpl.java:142)
        at com.sun.xml.ws.encoding.StreamSOAPCodec.encode(StreamSOAPCodec.java:108)
        at com.sun.xml.ws.encoding.SOAPBindingCodec.encode(SOAPBindingCodec.java:258)
        at com.sun.xml.ws.transport.http.HttpAdapter.encodePacket(HttpAdapter.java:320)
        at com.sun.xml.ws.transport.http.HttpAdapter.access$100(HttpAdapter.java:93)
        at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:454)

On the web service test return:

Exceptions details : java.lang.reflect.InvocationTargetException

Organised By: Sun Microsystems

Key Dates:
Deadline for Submission of Project Proposal: December 31, 2008
Contest Ends: April 30, 2009
Winners Announced: June 14, 2009

For Whom:
Any resident student (foreign or Indian) of an accredited Indian Educational institution.

The free and open source movement is emerging as the new world order in the technology sector across the world. Today, free and open source products such as Apache Web Server, OpenOffice.org and GNU/Linux have dwarfed several proprietary software products.

Sun Microsystems has announced the Second Edition of Code For Freedom 2008 Contest where students across India will contribute to the technologies that are empowering the Participation Age. One can gain industry experience while at college by participating in this contest.

Code For Freedom is an open source code contest conducted by Sun Microsystems targeting the student community. Through this contest, they intend to involve the large student community to join the open source movement by contributing to the various open source initiatives that Sun espouses.

The various Sun Technologies one can work on are: GlassFish, GridEngine, JavaDB, java.net, Mobile & Embedded, MySQL, NetBeans, OpenDS, Open ESB, OpenJDK, OpenCDS, Open HA, Cluster, OpenOffice.org, OpenSPARC, OpenSSO, OpenSolaris, PostgreSQL, VirtualBox.

For more details on the Technologies visit here.

One can view the prize details here.

For more details contact: codeforfreedom@sun.com

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Software Freedom Day 08 in Basilan Province, Philippines
Originally uploaded by yolynne

I had the opportunity last Saturday, September 27, 2008, to go back and visit again Isabela, Basilan Province and give an introductory talk about Free and Open Source Software. I am not a very geeky person, but I can deliver a talk and share about my personal experiences as to how I got involved with it. Being a FOSS enthusiast doesn't prevent you from using proprietary softwares but rather enables you to equip yourself and be educated with FOSS Alternative softwares. Some hard core FOSS promoters might get hurt with my intention of introducing FOSS as an alternative software, but the reason behind is that, we cannot force people to take or embrace FOSS applications immediately. We need to take it easy in teaching them and take one baby steps at a time. The process they undergo in using FOSS apps will eventually empower them and give an adrenalin rush and engage them to learn more; and that is my goal at the moment. I don't care if people ask me why I am still using Windows or another proprietary software because I still use Ubuntu Linux as well. I use both and I love them both period.

I would like to thank the organizers, D'Comtecian and their moderator Mr. Rj Ian Sevilla for a very well organized event.

The program started with keynote address given by Dr. Francis Sarmiento III of International Open Source Network ASEAN +3 and Mr. Ric Bahaguer of CPU-UNION and Mr. Jamjun Rivera of Jaycees Basilan. Dr. Sarmiento and Mr. Bahaguer delivered their address thru Skype since both are based in Manila.

Other speakers during the event were:

Ms. Grace Sojor who discussed about Java and the Netbeans IDE,
Mr. Jerico Rivera who talked about PHP and the CodeIgniter Framework,
Mr. Rj Ian Sevilla who demonstrated  the installation of Joomla and discussed its interface,
and yours truly who explained about FOSS and the philosophies and ideologies behind. I also demonstrated Ubuntu Linux thru live CD and discussed the different FOSS applications and its equivalent in the proprietary softwares.

We would like to thank the Sponsors of the event, who were very generous enough to support this endeavor:

Ubuntu Linux for sending us 8.04 CDs and Ubuntu t-shirts
Netbeans for sending Netbeans/Java CDs and Netbeans t-shirts as well
Wahoy.com for online media promotion
JeromeLocson.com for the CDs and the Streamer

I have uploaded some of the photos during the event including my travel to Basilan at Software Freedom Day 08 in Basilan Province

P.S.1
We celebrated SFD on the 27th since there were a lot of activities here in our area during the SFD day itself.

P.S.2
I will try to upload some more photos as well as the presentations of each speakers.

Thank you very much also to the very active and jolly participants with a lot of help from our emcee the funny Mr. Ryan. The said event is surely one of the most fun FOSS event that I have attended.

Should you have any questions or would want to contact me, you can reach me at yolynne [at] gmail.com.

NetBeans IDE

اولین IDE که NetBeans نام دارد محصول قدرتمند کمپانی Sun هست که از زبان های زیادی از جمله PHP , C/C++ , Java , Ruby و ... پشتیبانی می کند. این برنامه ی اپن سورس و رایگان در سیستم عامل های Windows, Linux, Mac OS X و Solaris قابل اجراست و آخرین نسخه ی پایدار آن در حال حاضر 6.1 می باشد. شما میتوانید علاوه بر دانلود نسخه ی کلی این برنامه که همه ی زبان ها را پشتیبانی می کند , نسخه ی مربوط به زبان مورد نظر خود را که حجم کمتری دارد با مراجعه به این صفحه دانلود کنید.

قبل از نصب این برنامه باید Java را در توزیع خود نصب کنید. نام بسته هایی که در توزیع های خانواده ی اوبونتو باید نصب شوند sun-java6-jre و sun-java6-jdk هستند. پس از نصب این بسته ها و دانلود نسخه ی لینوکسی مورد نظر خود که پسوند آن sh می باشد , می توانید NetBeans 6.1 را با اجرای دستورات زیر در محل فایل دانلود شده نصب کنید :

sudo chmod +x netbeans-6.1-ml-inux.sh
./netbeans-6.1-ml-linux.sh

بعد از اجرای دستورات بالا , مراحل نصب را به سادگی دنبال کنید تا نصب آن تمام شود.

Eric IDE

برنامه دوم Eric نام دارد که یک IDE اپن سورس و قدرتمند برای زبان های Python و Ruby است. این برنامه نیز تمام ویژگی ها و ابزار های یک IDE قدرتمند از جمله syntax highlighting , code folding , code calltips , project management و ... را دارا می باشد. همچنین با این برنامه که با زبان Python و کتابخانه های Qt نوشته شده است , می توانید رابط گرافیکی نیز با استفاده از کتابخانه های Qt طراحی کنید. این برنامه در دو نسخه ی eric3 و eric4 موجود است که به ترتیب با کتابخانه های Qt3 و Qt4 نوشته شده اند و در مخازن اکثر توزیع های معروف موجود است ولی اگر می خواهید آخرین نسخه ی این برنامه ( eric4 ) را داشته باشید , روش زیر را دنبال کنید‌ :

۱- بسته های Qt4 , PyQt4 , QScintilla2 , sip و نسخه ی dev آنها را در توزیع خود نصب کنید. نام این بسته ها در توزیع های خانواده ی اوبونتو ( 8.04 ) به این شرح است :

libqt4-* , python-qt4 , python-qt4-dev , python-sip4 , python-sip4-dev , python-qscintilla2 , libqscintilla2-3


** اگر از میزکار KDE4 استفاده می کنید , تعدادی از این بسته ها به صورت پیش فرض نصب می باشند.

۲- نسخه ی 4.2.1 برنامه ی eric4 را از این لینک دانلود کنید.

۳- فایل را از حالت فشرده خارج کرده و در ترمینال به فولدر آن رفته و دستور زیر را اجرا کنید:

sudo python install.py

۴- اگر در هنگام نصب با پیغام زیر مواجه شدید :
Please enter the name of the Qt data directory.
(That is the one containing the 'qsci' subdirectory.)

مسیر زیر را وارد کنید :

/usr/share/qt4

پس از پایان نصب میتوانید این برنامه را با دستور eric4 از طریق ترمینال اجرا کنید.

** اگر قصد برنامه نویسی با زبان Ruby را دارید , برنامه ی Netbeans گزینه ی بهتری می باشد.

Ok, lets start with WebSynergy, the very cool thing out there by the colloberation of Sun, Liferay!

Now, our dream development package includes liferay portal + Glassfish server with lots of capabilities i.e. SAW, openESB + Netbeans IDE (I still prefer Eclipse!)+ PortalPack + Groovy DSL/Grails support + Spring + hibernate + MySQL

Ok, if you want to use all these into your company's project, wouldn't it be smart to think of a GEnIUS Build tool to automate getting these sources into one updated package for you to use in development or for production!!

I think that would be incrediably cool to have such tool inhouse while you are developing, I think this calls for a new jcp proposal!

what do you think?