I experiencing random screen distortion & flicker after upgrading to Ubuntu 10.04, I’m using Acer Notebook.
After searching in internet, there’s many forum thread & bug report discuss about this but mostly they have different hardware.
Finally I tried this method and no flickering so far.

What I do is I change my grub configuration, adding kernel parameter “i915.powersave=0”.

For Linux expert probably this is not an issue, so I dedicate this step for the newbies like

1. What I do is I modify the grub configuration which is located on /boot/grub/grub.cfg (backup before you edit it)
2. Because the access right is set to read only, let’s change it so the owner can modify it.
   > sudo chmod -c u+w /boot/grub/grub.cfg
3. Use vi or your other prefered editor to edit it.
   > sudo vim /boot/grub/grub.cfg
4. Locate the menuentry of your Linux. Example:
   menuentry ‘Ubuntu, with Linux 2.6.32-22-generic’ –class ubuntu –class gnu-linux –class gnu –class os {
   recordfail
   insmod ext2
   set root=’(hd0,4)’
   search –no-floppy –fs-uuid –set xxx-xxx-xxx
   linux /vmlinuz-2.6.32-22-generic root=UUID=xx-xx-xxx-x-xx ro quiet splash
   initrd /initrd.img-2.6.32-22-generic
   }
5. Add “i915.powersave=0” to the linux kernel line as parameter. It will become:
   menuentry ‘Ubuntu, with Linux 2.6.32-22-generic’ –class ubuntu –class gnu-linux –class gnu –class os {
   recordfail
   insmod ext2
   set root=’(hd0,4)’
   search –no-floppy –fs-uuid –set xxx-xxx-xxx
   linux /vmlinuz-2.6.32-22-generic root=UUID=xx-xx-xxx-x-xx ro i915.powersave=0 quiet splash
   initrd /initrd.img-2.6.32-22-generic
   }
6. Save & restart to check if you still experiencing screen flicker

That’s it
Hope it can work on other Notebook/PC

Related posts:

1. Solving failed starting mysql service with non default datadir (Ubuntu)
2. Updating Pidgin to latest version in Ubuntu

REQUIREMENT

What you need:

1. LWUIT
2. Eclipse Pulsa
3. Emulator like Sun WTK
4. Know basic Java ME programming

CONFIGURE ECLIPSE

First you need to setup your emulator in Eclipse.
Run your Eclipse and select at the menu : Window – Preferences
Select : Java ME – Device Management – click Import
Then browse to your emulator folder, it will scan and give you option to add it to your device list.

Eclipse Pulsar Device Management

*I found that the automatic javadoc folder detection for each jar library is not all correct (I’m using Ubuntu 9.04, WTK 2.5.1)

CREATE NEW MIDlet PROJECT & CONFIGURE

Ok, now we ready to create the new project.
I assume you already know how to use Eclipse properly, create a new MIDlet Project there you will select your default emulator you want to use in the project, MIDP – CLDC version, etc.
After the new project created we gonna add the LWUIT library to the project.
Right click on the project (at package explorer) and select Properties.
Select ‘Java Build Path’ and tab ‘Libraries’ then click ‘Add External Jars’ and browse to select where your LWUIT jar is. (It will be on the lib folder where you extract you LWUIT zip)

MIDlet Project Properties

You will see the LWUIT.jar shown.
Select tab ‘Order and Export’, check the LWUIT.jar library so it will be included in our application jar.

Pulsa MIDlet project order and export

One of the cool thing about LWUIT is theme feature, you can see there’s ResourceEditor in LWUIT’s ‘util’ folder it’s for editing theme.
Let’s use default theme from the package. Copy file that located at ./LWUITDemo/src/LWUITtheme.res to our project ‘res’  folder (you can drag ‘n drop it to Eclipse).

THE CODING

Now we finally get to real coding.
Add a new MIDlet to the project. In my example I will create BasicForm Class:

package gnu.jimmy.blog.lwuit;
 
import java.io.IOException;
 
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
 
import com.sun.lwuit.Command;
import com.sun.lwuit.Display;
import com.sun.lwuit.Form;
import com.sun.lwuit.Label;
import com.sun.lwuit.animations.CommonTransitions;
import com.sun.lwuit.animations.Transition3D;
import com.sun.lwuit.events.ActionEvent;
import com.sun.lwuit.events.ActionListener;
import com.sun.lwuit.layouts.BorderLayout;
import com.sun.lwuit.layouts.BoxLayout;
import com.sun.lwuit.plaf.UIManager;
import com.sun.lwuit.util.Resources;
 
public class BasicForm extends MIDlet implements ActionListener {
 
	private Form form1;
	private Form form2;
 
	private Command cmdRotate = new Command("Rotate");
	private Command cmdSlide = new Command("Slide");
	private Command cmdExit = new Command("Exit");
 
	public BasicForm() {
		//Initialize the LWUIT
		Display.init(this);
	}
 
	protected void startApp() throws MIDletStateChangeException {
		//Load the Theme
		Resources r;
		try {
			r = Resources.open("/LWUITtheme.res");
			UIManager.getInstance().
			setThemeProps(r.getTheme("LWUITDefault"));
		} catch (IOException e) {
			e.printStackTrace();
		}
 
		//Setup Form 1
		form1 = new Form("Form 1");
		form1.setLayout(new BorderLayout());
		form1.addComponent(BorderLayout.NORTH, new Label("My First Form"));
		form1.addComponent(BorderLayout.WEST, new Label("WEST"));
		form1.addComponent(BorderLayout.CENTER, new Label("CENTER"));
		form1.addComponent(BorderLayout.EAST, new Label("EAST"));
		form1.addComponent(BorderLayout.SOUTH, new Label("Click Rotate"));
		form1.addCommand(cmdRotate);
		form1.addCommand(cmdExit);
		form1.addCommandListener(this);
		form1.setTransitionInAnimator(CommonTransitions.createSlide(CommonTransitions.SLIDE_HORIZONTAL, true, 1000));
 
		//Setup Form 2
		form2 = new Form("Form 2");
		form2.setLayout(new BoxLayout(BoxLayout.Y_AXIS));
		form2.addComponent(0,null,new Label("This is the second Form"));
		form2.addCommand(cmdSlide);
		form2.addCommand(cmdExit);
		form2.addCommandListener(this);
		form2.setTransitionInAnimator(Transition3D.createCube(1000, true));
 
		form1.show();
	}
 
	public void actionPerformed(ActionEvent evt) {
		//check which command cliked
		if (evt.getCommand()==cmdExit) {
			notifyDestroyed();
		} else if (evt.getCommand()==cmdRotate) {
			form2.show();
		} else if (evt.getCommand()==cmdSlide) {
			form1.show();
		}
	}
 
	protected void destroyApp(boolean unconditional) throws MIDletStateChangeException {
	}
 
	protected void pauseApp() {
	}
 
}

Try to run the class.
It should display a form and when you click the left softkey change to the second form with cube rotate effect.
When you click the left softkey again it will go back to first form with slide effect.

LWUIT sample

NOTE
* all  UI classes are from package com.sun.lwuit don’t import the WTK default.
* Display.init function (the one I put in constructor) needed to execute first before initializing Forms
* Theme need to be load first before initializing Forms
* Transition3D will require M3G, so if you want to test it on real phone make sure your phone support it. If not you can just change the Transition3D to CommonTransition.

ENDING

If you have prompt to follow the tutorial just drop me a comment here.

Cheers

Related posts:

1. Java ME (J2ME) JSON Implementation Tutorial/Sample
2. Simple Log4J implementation
3. Change junit & run file (main class) working directory at Netbeans 5.5 Web Project

• run this command in console to open vim editor :

sudo vim /etc/apt/sources.list.d/pidgin-ppa.list

(if you not familiar with vim use gnome editor with command : sudo gedit /etc/apt/sources.list.d/pidgin-ppa.list)
*since it’s using sudo command you will requested to enter your password to enter root mode)

• Add this line:

deb http://ppa.launchpad.net/pidgin-developers/ppa/ubuntu jaunty main

*I bold the jaunty since it will depends on your ubuntu version (8.10=intrepid, 9.04=jaunty, 9.10=karmic). If you not sure run this command : lsb_release –short –codename

* It will print out your ubuntu release codename

If you’re in Indonesia you can put UGM repository (instead the above line):

deb ftp://repo.ugm.ac.id/ppa.launchpad.net/pidgin-developers/ jaunty main

• Save the file. Since you don’t have the file (/etc/apt/sources.list.d/pidgin-ppa.list) it will create new file when you save it.

• Next you also need to download pidgin public key by executing this command:sudo apt-key adv –recv-keys –keyserver keyserver.ubuntu.com 67265eb522bdd6b1c69e66ed7fb8bee0a1f196a8
• Then open your Synaptic Package Manager and click Reload
• Write ‘pidgin’ in your quick search textbox and see if latest pidgin version is 2.6.x

Screenshot-Synaptic Package Manager

• Right click on the pidgin and select mark for upgrade and click apply

I hope the explanation is clear enough

Cheers..

Related posts:

1. Solving Pidgin cannot connect to Yahoo Messenger (YM)
2. Solving (fixing) ubuntu 10.04 (lucid) screen flicker/distortion

The JSON library I used is from json.org : http://www.json.org/java/org.json.me.zip
Extract it to your source code folder.

For example we have this User Class:

public class User{
   private int id;
   private String name;
   private String description;
}

To implement JSON to this class I usually create an Interface JSONAble:

public interface JSONAble {
String toJSON();
void fromJSON(String jsonString);
}

To make the User class is JSON compatible let’s add the JSONAble interface & implement it:

public class User implements JSONAble{
 
	private int id;
	private String name;
	private String description;
 
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getDescription() {
		return description;
	}
	public void setDescription(String description) {
		this.description = description;
	}
	public String toString() {
		return getId()+"-"+getName()+"-"+getDescription();
	}
 
	public void fromJSON(String jsonString) {
		try {
			JSONObject json = new JSONObject(jsonString);
			setId(json.getInt("id"));
			setName(json.getString("name"));
			setDescription(json.getString("description"));
		} catch (JSONException ex) {
			ex.printStackTrace();
		}
	}
	public String toJSON() {
		JSONObject inner = new JSONObject();
		try {
			inner.put("id", getId());
			inner.put("name", getName());
			inner.put("description", getDescription());
		} catch (JSONException ex) {
			ex.printStackTrace();
		}
		return inner.toString();
	}
}

To test it let’s create a MIDlet that have these startApp() implementation:

	protected void startApp() throws MIDletStateChangeException {
		//Converting Object to JSON
		User user = new User();
		user.setId(10);
		user.setName("jimmy");
		user.setDescription("testing json in j2me");
		System.out.println("Convert to JSON : "+user.toJSON());
 
		//Converting JSON to Object
		String sample = "{\"id\":99,\"name\":\"tester\",\"description\":\"This is JSON Data\"}";
		User user2 = new User();
		user2.fromJSON(sample);
		System.out.println("Convert from JSON : "+user2);
	}

As you can see the output results:
Convert to JSON : {"name":"jimmy","description":"testing json in j2me","id":10}
Convert from JSON : 99-tester-This is JSON Data

The toJSON() function is the implementation how the object converted to JSON format. In J2ME we still implement it manually since we don’t have Java reflection which can enable automatically scan the variables.
What the JSON library help is building the JSON data. We just need to put the variables.

On the fromJSON() function what it does is getting out the data from JSON format and set it to class variables.

Next I will cover about converting more complex class structure.
Or create a fromJSON () & toJSON() generator (:?). Let see..

Thanks for reading this, although this is the basic hope it’ll help

Related posts:

1. Basic LWUIT tutorial/sample with Eclipse Pulsar
2. Simple Log4J implementation
3. Java Application – Make sure only single/one instance running – with File Lock and ShutdownHook

Untuk menggunakan server kambing.ui.ac.id sebagai repository di Centos :

• Buat file dengan extension repo di directory /etc/yum.repos.d/ (Contoh: vim /etc/yum.repos.d/Kambing-Base.repo)
• Isi file:

[base]
name=CentOS-$releasever – Base
baseurl=http://kambing.ui.edu/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5

#released updates
[updates]
name=CentOS-$releasever – Updates
baseurl=http://kambing.ui.edu/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5

#packages used/produced in the build but not released
[addons]
name=CentOS-$releasever – Addons
baseurl=http://kambing.ui.edu/centos/$releasever/addons/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5

#additional packages that may be useful
[extras]
name=CentOS-$releasever – Extras
baseurl=http://kambing.ui.edu/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5

• rename file /etc/yum.repos.d/CentOS-Base.repo menjadi extension lain (contoh : mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.old)
• Saat anda menginstall dengan yum anda akan melihat repository yang digunakan adalah server UI.

Versi Centos yang dicoba dalam pengetesan adalah Centos 5.4 tetapi seharusnya berjalan disemua versi Centos (tentu asalkan repository versi tersebut dihosting di server kambing).

Enjoy ^^

No related posts.

By default when you run JBoss ( ./run.sh in Linux) it will bind to localhost/127.0.0.1
This will cause the JBoss default port 8080 cannot be access from other computer, because you need to open http://127.0.0.1:8080/ instead of your IP http://<your IP>:8080/

To make the JBoss binding to specific IP you need to run it with :
./run.sh -Djboss.bind.address=xxx.xxx.xxx.xxx
*which of course the xxx.xxx.xxx.xxx is your IP

Other PC will able to access the JBoss with that IP

For Windows I think it will be the same :
./run.bat -Djboss.bind.address=xxx.xxx.xxx.xxx

Cheers ^^

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Kemarin tanggal 17 Des – 21 Des 2009 saya berkunjung ke Bali untuk pertama kalinya, tetapi mengalami pengalaman yang tidak menyenangkan (masalah) di Hotel Kuta Lagoon Resort yaitu kehilangan amplop berisi uang yang saya letakkan didalam safety box dalam kamar saya.

Artikel ini bertujuan untuk mengingatkan teman-teman untuk waspada dalam menyimpan uang dalam berpergian, supaya tidak seperti saya yang percaya dengan keamanan safety box di dalam hotel.

Kronologisnya seperti ini:

17 Desember 2009
16:00 WITA : saya tiba di airport dan dijemput oleh staff hotel  dengan ramah.
16:30 : tiba di hotel dan check in lalu di antar dikamar. Sampai dikamar saya siap-siap dan menyimpan tiket, amplop berisi uang dan kunci gembok koper saya didalam safety box dan mengganti kode pin-nya .
17:00 : Saya bersiap-siap untuk keluar dari hotel untuk jalan-jalan dan ada janji bertemu dengan teman yang tinggal di Bali. Sebelum keluar saya mengambil beberapa ratus ribu dari amplop untuk saya bawa. Lalu saya keluar
23:30 : Saya kembali ke hotel tanpa memeriksa safety box dan tidur.

18 Desember 2009
10:00 WITA : Setelah makan pagi dan bersiap-siap keluar hotel saya membuka safety box dengan tujuan mengambil uang dan menemukan amplop sudah hilang. Saya berpikir apa saya lupa dan meletakkan amplop ditempat lain, maka saya mencari ke seluruh bagian kamar tapi tetap tidak menemukan amplop tersebut. Lalu saya menelpon pihak management hotel melalui operator telepon.
10:30 / 11:00 : Pihak  hotel datang dan menanyakan kronologis kejadian. Saya menjelaskan dan meminta pihak hotel untuk mengecek cctv untuk memastikan siapa yang memasuki kamar hotel. Dari office manager Bu Agustini, dia mengatakan harus menunggu bagian IT datang. Pihak management berjanji jam 3pm saya dapat kembali untuk melihat CCTV. Lalu saya pergi keluar hotel untuk jalan-jalan sesuai rencana.
15:00 :  Saya kembali kehotel dan diantar oleh office manager ke ruangan kerja. Disitu saya melihat rekaman cctv 17 desember. Tapi sangat disayangkan jarak kamera CCTV ke kamar saya sangat jauh sehingga sama sekali tidak jelas bila ada orang yang masuk atau keluar dari kamar saya. Dan ketika mulai gelap, lebih tidak jelas lagi. Saya berbicara dengan manager & security dan mereka berkata akan mencoba bertanya pada petugas housekeeping & engineer yang bertugas saat itu. Karena untuk kunci master kamar dipegang oleh housekeeper dan kunci master safety box dipegang engineer.
18:00 (kurang lebih) : Kembali dari jalan-jalan, masuk keparkiran hotel saya berpapasan dengan security yang sedang berbicara dengan petugas yang setelah berkenalan ternyata polisi daerah Legian, Pak Tono. Beliau menyarankan untuk melaporkan hal ini secara resmi ke kantor Polisi setempat, saya mengatakan sedikit ragu karena saya berpikir saya sudah kehilangan uang dan tidak ingin juga kehilangan waktu untuk jalan-jalan berlibur di Bali. Saya ingin bagian hotel melakukan inspeksi internal dahulu.

19 Desember
10:00 WITA : sebelum keluar dari hotel untuk tour, saya meminta bertemu dengan office manager untuk bertanya mengenai follow up dari kasus saya. Dia mengatakan polisi akan memberi kabar dalam 2 hari. Saya mengatakan saya tahu kemungkinan uang saya kembali kecil tetapi saya minta tolong untuk menfollow up hal ini. Dia meminta nomor telepon saya dan saya tuliskan di sebuah kertas.

20 Desember
10:00 WITA : saya keluar untuk tour dan tidak berkesempatan untuk bertemu management hotel. Tidak ada telepon dari pihak management.

21 Desember
10:00 WITA : saya check out dan bertanya pada manager mengenai perkembangan kasus ini. Lalu dia bertanya apa polisi sudah menghubungi saya, saya jawab ‘tidak’. Lalu ia masuk kedalam dan assistent manager, Pak Putu Wiarsa, menemui saya berkata saya harus ke kantor polisi bila mau memeriksa hal ini. Melihat secara internal hotel tidak ada follow up, saya setuju untuk ke kantor polisi saat itu juga. Dengan diantar dengan mobil hotel dan ditemani Pak Putu beserta housekeepers & engineers yg bertugas saat itu kami ke kantor polisi.
11:00 : Di kantor polisi saya menceritakan kronologis kejadian. Dibuat berita acara/laporan kehilangan dan dikirim 2 polisi untuk memeriksa kamar kejadian.
13:00 : Polisi memeriksa kamar hotel, tetapi tidak dapat melakukan apa-apa. Mereka menyayangkan kenapa tidak pada hari kejadian langsung membuat laporan ke polisi. Interogasi  beberapa hari setelah kejadian tidak akan memberikan hasil apa-apa.
Setelah itu saya dan pak Putu memanggil engineer untuk mencoba membuka safety box dengan kunci master untuk melihat apakah PIN/code akan berubah bila  dibuka, dan setelah dicoba tidak berubah. Ini memungkinan seseorang mengambil isi safety box dengan kunci tanpa mengetahui PIN dan menutup lagi tanpa merubah PIN yg ada. Ia mengatakan akan mencoba berbicara dengan management mengenai hal ini.
15:30 : Saya kembali ke hotel untuk bersiap-siap menuju airport dengan diantar mobil Hotel. Tetapi tidak terlihat manager atau assistent manager Hotel untuk memberi kabar tentang hal ini. Lalu saya berangkat menuju airport.

Demikian kronologis kejadian kehilangan uang saya di Hotel Kuta Lagoon Resort, Bali. Selain kejadian ini sangat menyenangkan berlibur melihat keindahan Bali.
Semoga cerita ini mengingatkan kita untuk waspada saat berjalan-jalan:

• Jangan membawa uang berlebih karena ada banyak ATM BCA di Bali.
• Lebih baik bawa barang-barang berharga dan jangan tinggalkan di Hotel.
• Untuk keamanan tanyakan apakah pintu kamar anda terlihat jelas di CCTV

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Go to your device manager:

• Start – Control panel – Device manager

Control Panel - Device Manager

• Select your wifi device in ‘Network Adapter’. Mine is “Intel (R) Wifi Link 5100…)
• Right click, select ‘properties’
• Select tab ‘Advanced’
• Select ‘Ad Hoc Channel 802.11 b/g”. Change the value to 1 (default is 11)

• Press OK

Now try again to copy files from Network.. If everything work perfectly you should able to get 2MB/s

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And there’s no option to disable this.
Maybe it’s like a ‘feature’, but in my opinion it’s suck to cannot select whether we want to sent this delivered notification or not.
For spammer this could be good ‘feature’ since they will know which email still actively receiving their spam.

In my blackberry curve there’s only option to disable ‘read notification’, which located at message – options – email settings.
But read notification is not delivered notification, when I disable sending read notification still the blackberry sending delivered notification automatically.
This is sucks, anyone know how to solve this issue?

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I google and several article/forum writing that need to flush dns cache and also about several YM server cannot be accessed from Pidgin.

I try my friend advice to change YM server configuration to IP rather than domain name.
And it’s worked..
You will need to use cn.scs.msg.yahoo.com as Pager server since June 24, or you can update to pidgin 2.5.7 to solve this problem

Some people are reporting changing the Pager server didn’t solve the problem, you can follow these instruction to update your pidgin to latest version (for Ubuntu) : Updating Pidgin to latest version in Ubuntu

The steps: 1. Select menu Accounts – Manage Accounts

2. Select your Yahoo Messenger account & click ‘modify’

3. Select advanced tab

4. Change your pager server to : cn.scs.msg.yahoo.com

5. Then disabled & enabled your account. Or restart the pidgin.

And your Pidgin should able connect to YM

*Update*
List IPs can be used (thanks to Med):
66.163.181.179 – 66.163.181.180 – 66.163.181.181 – 66.163.181.182 – 66.163.181.183 – 66.163.181.166 – 66.163.181.167 – 66.163.181.168 – 66.163.181.169

Starting June 24 using IP doesn’t seems to work anymore, try to use : cn.scs.msg.yahoo.com

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