Migrating between several Linux distributions

2012-01-10T22:37:00.000-08:00

Lets say you're migrating between two totally different Linux distributions. You've copied all of the settings and other stuff. And then you realise that you forgot to migrate databases from PostgreSQL or MySQL. And of course you don't want to reboot every time you want anything from the old system.QEMU can help you here. What you need - is to create a new VM which will use real partitions.In my

Windows Server 2008 r2 ip management from the shell

2011-12-30T05:26:00.000-08:00

Hello everybody :)Sometimes we have to do some not ordinary things, and it is really difficult to find the solution over the network.Perhaps, this post will help somebody, who wants to change the outgoing IP at his server based on Windows 2008. The main issue, that Windows server has no "primary" IP anymore. If your server's NIC has a set of IPs, numerically less IP will be set automatically as a

Making Java web application development easier

2011-12-06T21:28:00.000-08:00

If you have some web server where you deploy the web application in the exploded form and your source code is placed in another place for example in the local SVN copy - you have several options:Configure your IDE to deploy web application directly into your web server.Change your files in IDE and manually copy them into your exploded web application.Change your files in the exploded web

Cool JDK tools you probably never used

2011-12-02T06:47:00.000-08:00

Lets say you have some remote server running Java. How would you see what is happening with JVM? Connecting profiler remotely requires open ports and definitely won't be quick. Running profiler on the remote server is not usually possible since the servers rarely have X11 installed. In this case a bunch of tools from JDK may help you.These include:jpsjstatjinfojstackjmapjhatLet's have a look at

Hudson/Jenkins clash

2011-11-30T23:27:00.000-08:00

We're using Hudson for the purpose of CI. We've updated it not long ago and started getting errors like:java.lang.NoClassDefFoundError: org/jenkinsci/plugins/tokenmacro/DataBoundTokenMacroThese problems are caused by plugins we use to get PMD/FindBugs/CheckStyle results.The fix is to download and install token-macro plugin from:http://maven.jenkins-ci.org/content/repositories/releases/org/

Differences in PKG_CONFIG_PATH between MinGW and Cygwin

2011-11-15T00:09:00.000-08:00

When you're compiling some Linux library for Windows you can get the errors like these:Package gthread-2.0 was not found in the pkg-config search path.Perhaps you should add the directory containing `gthread-2.0.pc' to the PKG_CONFIG_PATH environment variableNo package 'gthread-2.0' foundIt's pretty straightforward for MinGW. Just do "export PKG_CONFIG_PATH = ~/lib/pkgconfig" where ~/lib/

Android Instrumentation, catch assertation error

2011-09-21T05:50:00.000-07:00

Hello Everybody,For a long time I have no single guess that it is possible to catch the error from the assertTrue(false) very simply.Yep, it is possible. Saneesh Joseph has opened my eyes!Sample snippet:try { assertTrue("Catch me if you can!", false);} catch(Error er) { Log.i(er.toString());}Thanks, Saneesh Joseph!Happy testing, folk! (:Best regards,Yahor

Android, get cell id

2011-08-29T03:26:00.001-07:00

Hello Everybody, A quick snippet to get CORRECT cell id for Android: public static int getCID(Context ctx) { try { TelephonyManager tm = (TelephonyManager)ctx.getSystemService(Context.TELEPHONY_SERVICE); GsmCellLocation location = (GsmCellLocation)tm.getCellLocation(); int locationCellid = location.getCid(); int cellId = -1; // set to unknown

Android, testing service from the test case!

2011-08-22T23:43:00.000-07:00

Hello everybody, This sample is specially created for Shivang Seth from Robotium conference and I would like to describe how to bind service from the test case! :) First of all you will need: 1) Bind/unbind methods for service for setUp() and tearDown() methods accordingly; 2) Connection class to bind the service; 3) Binder implementation inside the service, should have public method '

Android 1.5, get cell signal strength

2011-08-22T06:29:00.000-07:00

Hello everybody, Today I will tell you how to get signal strength for Android 1.5 :) Please find listener code bellow: PhoneStateListener mSignalListener = null; TelephonyManager mTelManager = null; private void initSignalStrengthListener() { PhoneStateListener mSignalListener = new PhoneStateListener(){ @Override public void onSignalStrengthChanged(int asu){

Android, test sms sender and reciever

2011-08-17T00:30:00.001-07:00

Hello Everybody, I have to implement sms service, and have doubt that testing would be very painful. But I was wrong, google did everything right! :)) To test sms we are able to use 2 emulators (I'm using Android 1.5 emulators, red one, very cute and very fast!) To send a sms, inside the field "TO" type the port of the second emulator, for instance, I have 2 emulators:1) 55542) 5556To send sms to

Android, creating mock geo locations

2011-08-17T00:10:00.000-07:00

Hello Everybody, Today I was playing a lot with GPS and found that in some places, and exactly at my working place in office GPS is not working :)) I saw that my co-workers walking a lot outside the office with devices on hands, but I don't guess what they are doing untill I got a task to implement GPS based service. What a surprise, I have to walk outside the office too xDD to make

Bind service in the tab activity

2011-08-16T23:58:00.001-07:00

Hello everybody, Today I have found a really serious problem :) I was trying to bind the service to the tab activity (activity inside the tab host) and I was constantly getting same error: ActivityManager::Binding with unknown activity: android.os.BinderProxy@124ef127 I have googled a bit and found the reason of the issue:http://code.google.com/p/android/issues/detail?id=2483 In few words, to

Draw 1px border around the group of views in Android 1.5

2011-08-12T00:06:00.000-07:00

Hello Everybod, Few days ago I have faced the issue, that I'm not able to draw the border around the group of views in Android 1.5, because it has no support for standart approach with shapes in drawable :))

Universal way to detect landscape mode in Android

2011-08-05T05:01:00.000-07:00

Hello everybody,Today I have faced a real challenge how to determinate the screen mode :)Issue was to detect orientation (Landscape or portrait) for ANY Android device.Xoom has 0,3 - landscape 1,2 - portrait, Galaxy 1,2 - landscape 0,3 - portrait,so it is difficult to handle all necessary events for different devices due to theirs default orientation. I didn't find the way to get default

Sample to Control Screen Brightness

2011-07-26T02:35:00.000-07:00

Hello Everybody,this sample help us to create Screen Brightness Controller.1) Add sample Activity:public class MainActivity extends Activity { private static final String BRIGHTNESS_PREFERENCE_KEY = "brightness"; private View brightnessView; private SeekBar brightnessControl; private int brightness = 50; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(

Convert hex to dec

2011-07-13T00:15:00.001-07:00

Hello Everybody,All the time I was using online tools for converting hex to dec values :)I have learned the ways to do that quickly in the mind, but anyway, if you need to convert a lot of values it is not acceptable.For my pleasure, I have found an intersting and easy way how to convert hex to dec via terminal in Ubuntu :)echo $(( 0xfff )) And you will get: 4095 value in output. (Do not forget

How to "close" activity and all children activities

2011-07-12T23:53:00.000-07:00

Hello Everybody, I was implementing a multi activities application and was really surprised that it is not easy to close all of them from the main activity when user hits 'Exit' :) In general, in Android way it is not logical to "close" something, it is better to move something to the background :) I found it after a day of fighting with activities. First of all, ** and it is very important **

How to get battery stats in the real time. Part 2.

2011-07-12T23:18:00.000-07:00

Hello Everybody,Lets talk today about how to get battery stats in the real time! :)Sample activity:public class ChargeSourceInfoActivity extends Activity {TextView chargeSourceInfo;private TextView battLevel, battVolt, battTemp,battTech, battStatus, battConn;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.chargesource);chargeSourceInfo =

Extract HEX (RGB) color from UIColor

2011-06-28T00:06:00.000-07:00

Simple function to extract HEX (RGB) color from UIColorImportant notes:1. Function checks the color components number (in case of monochrome color model)2. Function supports RGB color space model only - otherwise returns black color- (NSString *) htmlFromUIColor:(UIColor *)_color { if (CGColorGetNumberOfComponents(_color.CGColor) < 4) { const CGFloat *components = CGColorGetComponents(_

Password Based Encryption with MD5 and DES algorithm.

2011-06-16T06:16:00.000-07:00

In posts of Alexey Shevchik dedicated to "Symmetric Encryption for Windows and iPhone"Part 1: Symmetric Encryption for Windows and iPhone (part 1)Part 2: Symmetric Encryption for Windows and iPhone (part 2) was described algorithm to encrypt and decrypt files using Crypto library. The algorithm that was used is named RC4.I modified his sources to have possibility encrypt/decrypt strings with

OL tag in Firefox 3.6

2011-05-20T07:49:00.000-07:00

Noticed a very interesting effect in the latest FireFox 3.6.I have table and display OL tag in TD. Result is interesting:After changing OL to UL, starts looking fine:

Compilation of FFMpeg under Debian

2011-05-18T06:04:00.000-07:00

One of the typical projects we have are mobile applications which contain both server and client part. Client application usually displays some stuff which is maintained via some server UI. Not long ago we've noticed a bug playing AMR file on iPhones. Since the files are dynamic and are sent from the client devices - the best approach to overcome this is to convert this file on the fly.The server

Why do I like my Fedora?

2011-04-25T23:03:00.000-07:00

The deeper I get into this OS - the more I appreciate it.Yesterday I was playing with Qt because one tool had very exotic dependencies. As a result - I started getting the following errors when starting Skype:skype: error while loading shared libraries: libQtGui.so.4: wrong ELF class: ELFCLASS64skype: error while loading shared libraries: libQtNetwork.so.4: wrong ELF class: ELFCLASS64The fix was

Small Java test

2011-04-25T22:17:00.000-07:00

Here's a small Java snippetint sum = 0;for(int i = 1; i <= 3; i++) { sum =+ i;}System.out.println(sum);What should this code print?136Compilation errorCheck Your Answer

Saving RSA keys in files from iPhone application

2011-04-06T08:34:00.000-07:00

This is my first post which I wanted to write after I get some experience in generating RSA keys on iPhone. I hope it can help some people to avoid troubles which we got while working with RSA keys. This post describes how to create RSA-keys in iPhone-application. In Apple documentation we can find how to make key pair with usage of standard frameworks (Security framework and CommonCrypto library

Android, take a screenshot

2011-04-06T05:46:00.000-07:00

Hello everybody,To take a screenshot you can use a simple method:For those who do not know how to add imports :)import android.graphics.Bitmap;import android.graphics.View;import java.io.File;import java.io.FileOutputStream;p, li { white-space: pre-wrap; } // set your locationprivate static final String SCREEN_SHOTS_LOCATION = "/media/screenshots"; public static void takeScreenShot(View view,

Android, playing with dumpsys

2011-04-05T13:11:00.000-07:00

Hello everybody,This article is continue of the battery stats dumping example article.In this article I will discover, what information can we retrieve from dumpsys shell command and how we can use it.Obvious benefits:1. Possibility to easily get system information in a simple string representation;2. Possibility to use dumped CPU, RAM, Battery, storage stats for a pretty charts, which will allow

Android, easy way to get battery stats

2011-04-05T06:33:00.000-07:00

Hello everybody,Many times I was trying to get battery usage stats, especially charge level. I didn't find any cool way to do that quickly and forgot about it.Today, I'm accidentally find a simple and interesting way to get all possible battery statistic:$~ adb shell dumpsys batteryYou will get output: Current Battery Service state: AC powered: false AC capacity: 500000 USB powered: true

Mac OS 10.6, set environment variable

2011-04-04T05:27:00.000-07:00

Hello everybody,Main goal: make some custom path variable available permanently using some environment variable. For ant build, for example.I got an issue to deploy Android environment with our big project on Apple Mac Mini, and I have found that it is not so easy as on Ubuntu to set an environment variable. To do that, you can follow support article.In few words, you need to create:1. Folder: .

How to switch to fullscreen mode an application based on Netbeans platform

2011-03-30T08:47:00.000-07:00

E.g. we need open a window MyTopComponent (mode: output) and switch an application to fullscreen.Before that we should hide other opened windows, e.g. PropertyTopComponent (mode: output) and FoldersTopComponent (mode: explorer).Let's override and implement few methods of two classespublic final class MyTopComponent extends TopComponent { @Override public void componentOpened() {

How to create a menu-item for GUI application based on Netbeans

2011-03-30T01:45:00.000-07:00

Let's add an item that would have the name and availability depends on something (e.g. logged in user or not)At first you should create a new Action (it mean menu-item) with type 'Always Enabled' via the wizard.layer.xml will be modified and you can find next definition

How to implement login/logout in the Facebook through desktop application

2011-03-30T00:51:00.000-07:00

You have to take a web browser (e.g. The DJ project), which will be inserted into your desktop application.Navigate tohttps://graph.facebook.com/oauth/authorize?client_id={client_id}&redirect_uri=http://www.facebook.com/connect/login_success.html&type=user_agent&scope={permissions}and the login form will appear.You need to input an email and password, and to press Login.After this user will be

Windows security, firewall, windows grep, netstat

2011-03-29T15:48:00.001-07:00

Hello everybody,I was surprised by MS Windows 7 firewall :)And looks like it is present in previous versions of MS Windows..In fact, you can type firewall.cpl in the run window (windows button + R) and you will see a window with firewall settings, you can click 'Advanced settings' and block any inbound or outbound requests in few clicks if necessary! Or you can use cmd:C:\firewall.cplIt is very

MS SQL, the most funny exception I have caught in my life :)

2011-03-29T14:44:00.001-07:00

Hello everybody,I like to do some experiments sometime, today I have caught a super cool exception :)Just try to imagine: you are doing tests with super real time system which is working under heavy load and inserting a lot of rows same time. All is fine, all is cool.One day you are getting in the log an exception and your system stops writing anything into the database:Arithmetic overflow error

Android, reproducing physical buttons click for HTC Desire

2011-03-29T06:24:00.000-07:00

Hello Everybody,I have investigated how to click harware buttons, such a power button, unlock screen button, menu etc :)It is very simple, all hard clicks are going through event5 interface on HTC Desire, you can use:~$ adb shell geteventAnd you will get list of supported interfaces:add device 1: /dev/input/event9 name: "compass"add device 2: /dev/input/event8 name: "curcial-oj"add

Android, decoding click low level event

2011-03-29T05:55:00.000-07:00

Hello everybody,I have completely decoded today the click event, so we can manipulate with all click parameters :)Complete click in 122:312 point on screen (in decimal representation, not HEXA):# X,Y will be set pair: where 0048 - X will be set, 104 - square of finger, touched the screen!sendevent /dev/input/event2 0003 0048 000000104# X,Y will be set pair: where 50 - Y will be set, 10 is a

Android, copy file from device to the local disk

2011-03-29T05:48:00.000-07:00

Hello Everybody,Just a simple terminal command to copy file FROM device to the local disk:~/adb pull /sdcard/your_file.ext /home/your_folder/ your_file.extVery simple and useful to know :) Also, you are able to rename file: your_file.ext to 1.ext for instance :)Other cool commands for adb you can find on android wiki page:How to use android debug bridgeBefore I forget, to copy file back to device

Improvement of building process

2011-03-23T13:50:00.000-07:00

We have one big project. And as all big projects it's build takes long time - it is the problem, because it is wasting time :-(First some words about project architecture. It is based on Java EE 5 (we use EJB, JPA, JMS, etc.) and we use GWT for building rich user interface. Also, for static pages, we use Magnolia CMS. And as result building of it is not quick.After some analysis I found obvious.

One more library for JSON parsing

2011-03-23T01:44:00.000-07:00

I want to introduce you with one more library, which help us to parse a JSON into java object and vise versa.This is the GSON. More info you can get from oficial site. I just show you simple example.E.g. we have a following json[ { "title" : "Root1", "object_version" : 3, "status" : 1, "items" : [] }, { "title" : "Root2", "object_version" : 3, "status" : 5, "items" : [ { "title" : "

Android, reproducing swipe motion to unlock device, part #3

2011-03-23T01:29:00.000-07:00

Hello Everybody,Previous tutorials with basics you can find here:Part 1: essential basicsPart 2: implementing click on screen function using shell scriptDumped and converted events, we can send to unclock device:system("adb shell sendevent /dev/input/event2 0003 0048 00000070");system("adb shell sendevent /dev/input/event2 0003 0050 00000010");system("adb shell sendevent /dev/input/event2 0003

Android, ClickOnScreen(x,y) shell script function for automated testing, part #2

2011-03-22T13:32:00.000-07:00

Hello everybody,Part 1 with essential basics here.Now it is time to create a simple and useful shell script with one function - ClickOnScreen(x,y).PART 2: implementing simple shell script with ClickOnScreen(x,y) function.Prerequisites:1. Terminal;2. You favourite text editor;3. Configured and run Android environment + test device/emulator.Okay, so our main point is to create an automated script

Android, writing events low level touch screen automated shell test, part #1

2011-03-22T12:43:00.000-07:00

Hello everybody,Some information I have already covered in the article:How to click screen using shell script (Froyo)- In the beginning of this article you will find how to reproduce click for before Froyo AndroidSo lets start from the beginning, for implementation of automated test you need only 2 simple and essential shell commands:~$ adb shell getevent~$ adb shell sendevent $device $command $

Android, low level shell click on screen

2011-03-22T07:03:00.000-07:00

To send touch event you need to do: 1 Set coordinates: adb shell sendevent /dev/input/event2 3 0 xadb shell sendevent /dev/input/event2 3 1 y 2 Send touch event (must have 0 0 0 pair): adb shell sendevent /dev/input/event2 1 330 1adb shell sendevent /dev/input/event2 0 0 0 3 Send release finger event (must have 0 0 0 pair): adb shell sendevent /dev/input/event2 1 330 0adb shell sendevent /

Spring IoC

2011-03-21T23:43:00.000-07:00

I like spring framework - it is very flexible and provides a lot of useful mechanisms, but sometimes configuration of spring-base project is very annoying.On one our project we mix xml-based configuration with annotation-based configuration. The rule is very simple for this: use annotations and if you need additional flexibility then use xml. Also we use xml for configuration standard mechanisms,

Android testing, basics, running a set of tests automatically

2011-03-15T02:45:00.000-07:00

Hello everybody,Today I will cover a simple, but extremely useful topic - how to run all your Android automated tests :)For example, you have created some classes, which are extending ActivityInstrumentationTestCase2 and you are not satisfied by running this classes one by one, lets assume you want to run all your 100 classes using simple approach or hitting one button and leave the office and

Localization in GWT via cookie

2011-03-03T02:48:00.000-08:00

If you'll search for the term "Localization in GWT" - you'll find numerous articles about using META tag with gwt:property name, like But sometimes it's not very convenient. For example we have an iframe with reference to some another GWT module and this module bypasses META tag written for the parent document. In this case cookie is the easiest

Android testing, avoiding screen lock during testing

2011-03-03T01:11:00.001-08:00

Hello everybody,If you run a pretty complicated tests which are working till battery dies you know, that it is a big problem when screen locks :) Using setting you can set screen wait timeout to 2 hours. But what you need to do, if you need test to work 24 hours? Touch screen every 2 hours? :) No!Just use very simple snippet:package com.your.testpackage;import android.os.PowerManager;import

PHP, complex string comparison

2011-03-02T12:57:00.000-08:00

Hello Everybody,Disclaimer: I'm not familiar with PHP, using it super rarely if somebody really needs my help :)Some time ago I had to write a PHP function for one popular CMS for searching products in the database.Main target - find correct products if user is doing typos in the input, for example:Find 'testers are cool' if user enters 'Tecteps ur kyl'.I like SQL and know about one cool function

.Net basics: using configuration file to configure logging and database connection string

2011-03-02T12:00:00.000-08:00

Hello everybody,Today I will cover next topics - How to configure logger and database connection string in .Net Framework X.X via xml configuration file.To add logging into your application you have to do few simple steps:1. Add a configuration file into your project: Project -> Add new Item -> Application configuration file or CTRL+SHIFT+A -> Application configuration file;2. Open the file you

Funny quiz

2011-02-28T03:34:00.000-08:00

Hello everybody,Today one friend of mine asked me to help to solve a simply "5 minutes" issue, because he is stuck and do not see the way to solve it.Issue: you have 3 variables:- startTime;- stopTime;- currentTimelAll of them are measured within a single day in format 00:00:00 - 23:59:59, no matter what is the day of the week etc. Lets assume these values are parsed from the configuration file

ActiveJDBC

2011-02-25T06:20:00.000-08:00

You often write small tools for processing data from databases? You like the way GORM provides access to database in Grails? You don't want to use these heavyweight Hibernate/TopLink/iBatis? JPA is too enterprisy for you? Then you definetely need to have a look at ActiveJDBC.To integrate it into your Maven build just add the following dependencies in dependencies section:

Ubuntu, streaming radio

2011-02-25T05:23:00.000-08:00

Hello Everybody,Because of I'm 'windows guy' I thought it will be very difficult to listen to the online radio in Ubuntu, but I was not right! It is very easy and cool.If you are enjoying online radio everyday and would like to rip it onto your hard disk, it is super easy to do in Ubuntu with streamripper:1. ~$ sudo apt-get install streamripper2. ~$ man streamripper-- How to rip the radio:GETTING

Android, using terminal for disovering connected device

2011-02-25T02:58:00.001-08:00

Hello everybody,Here is a quick article how to:1. Install apk into Android device;2. Uninstall applications;3. Discover device's filesystem;4. Open and read files;5. Copy files onto device.Prerequisites:First of all you need to connect to the device's operational system shell, use your Terminal for this purpose and type:~$ adb shell-- You will see '#' that means you are in.If it is not working

Ubuntu, using svn from terminal

2011-02-25T02:28:00.000-08:00

Hello everybody,One day I had problems with GUI svn client and a big headache how to commit my changes. I have found how to do that using Terminal and from that moment I'm not using any single GUI svn client :))1. Getting svn sources from the svn repository:-- Go to the folder you want to make you project's folder and type a simple command:~$ svn co 'here address of svn repo'emaple: svn co https:

Ubuntu, network operations, basics

2011-02-25T01:34:00.000-08:00

Hello everybody,I still discovering Ubuntu for myself and like this OS more and more everyday, it is much more comfortable for work rather than Windows 7, no viruses, no antiviruses, no headache, no problems, just freedom :)Today I have discovered how it is easy to work with network, for example I need to add a shared resource.I have found that I can use Samba, but samba is not installed on my

GWT migration

2011-02-24T07:33:00.000-08:00

We're using GWT 2.0.3 on one of our projects. Today we've noticed a very strange defect in IE8 and decided to upgrade to the latest version which is now 2.2.0.So initially we've got three modules with four languages specified. All this stuff was referencing GWT 2.0.3 and gwt-maven-plugin of version 1.2 was used for compilation.During upgrade the following changes were done:Referenced GWT version

WebDav, adding an appointment

2011-02-24T04:05:00.000-08:00

To add an appointment you need to send a simple xml message to the MS Exchange Server uisng WebDav:

Introducing WebDav, getting appointments

2011-02-24T03:25:00.000-08:00

Hello everybody, today I will introduce a very cool technology called WebDav, I think most of you know about this technology, but possibly this post will be helpful for newbies or those who is trying to choose from different technologies to access MS Exchange server.(You can find a lot of very cool resources related to the WebDav using your favourite browser, for example here - http://

How to suppress certificate verification errors

2011-02-24T03:17:00.000-08:00

When I was implementing WebDav web-service bridge between custom corporate system and MS Exchange Server 2007 I have got a very annoying issue with ssl certificate checks, you know, it is when your favourite browser shows message: "Add security exception or leave this place" (something like this). Of course it is necessary for browser and for surfing Internet, but sometimes we simply do not need

Grails console

2011-02-23T04:13:00.000-08:00

Grails is becoming more widely used in our projects. Today I was looking one presentation about GORM and noticed that a guy used a very nice tool. It's grails console which can be used to test your code very quickly.The command to run is grails consoleIt opens the window where you can write groovy code related to your project.So I've written a small test code which create 20 objects:20.times { i

Restoring GRUB loader after Windows 7 install

2011-02-22T01:27:00.000-08:00

I have installed Windows 7 237 days ago at my laptop and then had no time to restore Ubuntu 9.04 loader all this time, but when I have started using Ubuntu every day at work I decided to get Ubuntu working on my home computer too! :)It is really very simple to restore GRUB loader, all you need is to have live cd with Ubuntu, follow instructions bellow if you need to repair GRUB loader which was

Solo autoscroll issue solution

2011-02-22T00:54:00.000-08:00

Robotium Solo - is very cool abstraction layer with pretty nice implementation, but as usual it can't fits everybody's needs, for example:You need to find some text on the screen and click it, using solo it looks like:/*Solo search methods have a comment: 'Will automatically scroll when needed'this logic is causing a lot of problems when scrolling down procedure is stuck in the end of the list

Touch, hold, swipe, release gesture simulation in Android Unit test

2011-02-17T06:53:00.000-08:00

There are a lot of various frameworks which are provide you with a very useful methods for writing unit tests for Android applications. But when you need something specific almost everything you have to do it yourself.For example, simple actions sequence: touch screen, hold finger few seconds and slide it slowly to the random side of screen, release. Such simple gesture can't be reproduced by any

optimizing IntelliJ Idea performance on Ubuntu

2011-02-17T05:37:00.000-08:00

When I have started developing on Ubuntu using IntelliJ Idea IDE, I have encountered a real trouble with IDE's performance, it was just killing. After few hours of googling I have accumulated an instruction how to improve java related IDE performance on Ubuntu (and Ubuntu's performance too).This simple guide will help you to develop with pleasure:-- If you have only open jdk it will slow down the

Migration to Maven 3

2011-02-17T04:46:00.000-08:00

I've read a number of articles which say about new cool features like parallel builds and performance speed-ups. Sounds rather sweet.So I've taken the current project I'm working at and migrated it to Maven 3 to check if it's possible to get any compilation speed-up. The only thing which was changed in the root pom.xml was replacing http://download.java.net/maven/1 repository with http://

Blackberry connection Connector.open

2011-02-15T06:24:00.000-08:00

The task under discussion is opening some connection on Blackberry device, and receive a content of some URL (or post some message).The OS version that our application should support was 4.5+, so we were not able to use ConnectionFactory class, that is since 5.0.0 and seems to support method mentioned here.So BlackBerry could be connected to the Internet over the several types:BIS - BlackBerry

Weird TopLink exception message

2011-02-04T05:45:00.000-08:00

Got a strange exception today during executing a dynamic JPA query via TopLink.It looks like:Caused by: line 1:25: unexpected token: nullat oracle.toplink.essentials.internal.parsing.ejbql.antlr273.EJBQLParser.rangeVariableDeclaration(EJBQLParser.java:1727)... 136 moreInitially the query looks like "select o from Test". It's definitely not correct because it should be "select o from Test o". But

Blackberry compilator preprocessor. Prepare builds for multiple OS versions from single sources

2011-02-04T02:02:00.000-08:00

For blackberry there is always a need to prepare builds for different BlackBerry OS versions.Here is the instructions how to do this without having different branches of sources for each OS verion:Use a //#preprocess tag at the begin of the file, this will tell a compilator to use a preprocessorUse //#ifdef SOMETHING //#else //#endif, or //#ifndef SOMETHING //#else //#endif - to include or not

Blackberry application signing, OTA (Over The Air) donwload to mobile

2011-02-04T01:48:00.000-08:00

I've just finished my BB application. But I forgot how to prepare correctly .jad file for download application Over The Air directly from BlackBerry browser. As there are quite a lot of different questions regarding this on blackberry forums, I decided to write here some notes for Alex Kutsko in future :).JDE is not updating correctly .jad file after clicking Build All, so better to remove .jad

Integrating JAX-WS into Magnolia CMS

2011-02-03T05:42:00.000-08:00

Got a task today to add support of JAX-WS into our Magnolia based project. Hell. I took me 30 minutes to add support for JAX-RS(Jersey). But it took about four hours to do this for JAX-WS.The first step is quite trivial we need to create web service itself:package com.softteco.ws;import javax.jws.WebMethod;import javax.jws.WebParam;import javax.jws.WebService;@WebService(serviceName="PingService"

Error compiling JasperReports report with Maven

2011-01-31T02:50:00.000-08:00

Was configuring a new server for our application. Checked out sources from SVN and started compiling them with Maven. One of the pom.xml files contains instructions which precompile report JRXML files into JASPER files by the means of jasperreports-maven-plugin plugin.I was greatly confused when saw something like this:Error compiling report design : /home/andy/Sources/trunk/service/src/main/

Internationalization of the Magnolia Freemarker templates

2011-01-11T06:19:00.000-08:00

To extend the contents of Magnolia CMS - we have created several custom paragraphs. Once we need a localization for these paragraphs - we've tried a usual approach used in STK. So we've written something like${i18n['custom.goToTop']}in the FreeMarker template and got the following error immediately:freemarker.core.InvalidReferenceException: Expression i18n is undefined on ...What the hell, our

Designing Magnolia e-mail templates

2011-01-05T23:21:00.001-08:00

Mailing functionality is rather natural for any application. You often need to send e-mails about registration or order confirmation. This post describes a way which has been used to design e-mail templates for Magnolia CMS. It provides a nice module to work with the e-mails.You can easily register a template and send it via the following code:Map parameters = ...;final Context

Overview of the op4j library

2011-01-05T02:00:00.000-08:00

I'm a huge Groovy fan. Still in process of learning it but already understand that some of its features are really outstanding. I wish we have the same collections and closure support in plain Java. However it will take some time until Java 7/8 would be released to use all these tasty things in production. Found out that there's a nice library which can make a day-to-day development easier. It's

Custom resolution in VirtualBox

2010-11-16T01:44:00.000-08:00

Sometimes you need some resolution to check the design of the website. And VirtualBox Video adapter provides only a small set of the predefined resolutions. This can easily be fixed by using the following shell command: VBoxManage controlvm XP setvideomodehint 1280 800 24 This command will set the 24-bit colors, 1280x800 resolution for the XP virtual machine.

Uploading files in Magnolia CMS

2010-09-22T04:28:00.000-07:00

We need to have an upload functionality in our web application based on Magnolia CMS. So I've created a small servlet which uses commons-upload library from Apache. So the code looked like: FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); List items = upload.parseRequest(request); However the list of items was empty. Trying to

PostgreSQL 8.4 two-phase commit j2ee5 Glassfish

2010-09-10T01:18:00.000-07:00

Recently we moved our server from Postgresql 8.3 to Postgresql 8.4, and I faced with a problem with some functionality mulfunction. In glassfish domain log I found errors that transaction could not be rolled back during postinvoke on bean.The problem was found out when I went to the logs of PostgreSQL:2010-09-09 17:19:09 EEST ERROR: prepared transactions are disabled2010-09-09 17:19:09 EEST HINT

WorkFlows

2010-09-09T08:58:00.000-07:00

A workflow it is a depiction of a sequence of operations, declared as work of a person, a group of persons, an organization of staff, or one or more simple or complex mechanisms. It may be seen as any abstraction of real work, segregated in work share, work split or other types of ordering. A simple workflow may look like: Some of the workflow systems are described below. jBPM jBPM is a

Mistery of reading GMail inbox by JavaMail via POP3

2010-09-02T05:02:00.000-07:00

Today I've got a very strange problem reading Gmail INBOX via POP3. Yesterday I was able to read all of the e-mails, but today something strange began to happen. In the reality mailbox had five e-mails, application was able to read four while the JUnit test which has exactly the same flow was able to read only three of them. Went to the setting of the POP3 - it looked like: So POP3 is

Inlining of method calls in JVM

2010-08-16T01:49:00.000-07:00

Was listening to one of the Oracle TechCasts today: Towards a Universal VM. The talk was surrounded on the different capabilities of JVM. And there was a mention about inlining methods in JVM. So I've decided to write a small test to see how does inlining influence the performance. Test simply concatenates two strings. So I've looked at three variants here: Direct concatenation. Something like

Testing JavaScripts via JUnit

2010-08-13T01:04:00.000-07:00

It appears that JDK 1.6 introduces a new javax.script API which allows to run script languages on the server side. Currently only JavaScript is supported. So I've decided to try this out for testing of some of my simple JS scripts via JUnit. Below is the snippet I've used to test data import javax.script.Bindings; import javax.script.Invocable; import javax.script.ScriptEngine; import

Running EcPerf to measure performance of WebSphere Community Edition

2010-08-06T05:13:00.000-07:00

So today we have decided to measure performance of the IBM WebSphere application Server Community Edition. EcPerf has been selected as a standard J2EE performance measuring kit. This application server from IBM is based on Apache Geronimo. So all the additional steps required to configure EcPerf to run on Apache Geronimo are quite the same. Detailed information on the difference between WAS CE

Integrating Magnolia CMS and custom application security

2010-07-09T04:25:00.000-07:00

We have an application integrated into Magnolia CMS. and it's quite natural to have a single way of handling security. Both Magnolia and our application use JAAS for authentication. However magnolia uses JCR repository to store security data, while our application uses database. Since we didn't want to cause some possible side effects in Magnolia - the following model was applied: users and a

Java Resource File editor

2010-07-09T01:39:00.000-07:00

Localization support in Java is rather good. But what about the convenience of providing localized resource bundles? I usually use NetBeans for the development and editing resource files. But what if you would like to provide this localization files for your customer? So we've decided to do some investigations on this topic. The primary criteria according to which the tools were estimated are

How programmatically to add a portlet into Layouts (pages)

2010-07-06T03:35:00.000-07:00

Some times you need to add portlet using java-code (e.g. during importing a publication from the old portal). Let’s look how can we do it with WebContentDisplay. In my case I have used stand-alone program so I had to define this portlet:private void initPortlet() { String[] xmls = new String[] { // xml from /WEB-INF/portlet.xml "" + "<

Android testing with Robotium (click on Button)

2010-07-06T01:37:00.000-07:00

Robotium is the framework what allow us to create automatic tests for Android.Let's see small example how to click on ImageButton (or other) using its id.public void testAboutBtn() { // get a list of all ImageButtons on the current activity List btnList = solo.getCurrentImageButtons(); for (int i = 0; i < btnList.size(); i++) { ImageButton btn = btnList.get(i);

Android game development part 2 (DalvikVM performance)

2010-06-18T01:34:00.000-07:00

In this part we will talk about DalvikVM performance. DalvikVM is a Java virtual machine for Android. The main disadvantage of DalvikVM is Garbage collector. Garbage collector when it is called freeze application on x00 milliseconds. This freezing is not acceptable for real time games so the we should minimize memory allocation. "Memory allocation tracker" tool help us with this work. When I

Android game development part 1 (Testing performance)

2010-06-17T23:55:00.000-07:00

Game development for Android is not a simple thing as you can imagine from the first view. First of all we should talk about Testing performance with eclipse. Let's see what we need to test performance:eclipseandroid SDKandroid plugin for eclipse We have to have an android emulator with SD card for testing. SD card should be at least 64mb because android writes performance data directly to the

Developing using GWT Hosted Mode remotely

2010-06-17T03:48:00.000-07:00

Lets say you are running Linux. And of course you want to support IE browsers in your GWT application. So you have tested the application in Firefox which works perfectly with the GWT Development plugin. So you've decided to test application in the running IE browser of the Windows guest and you observe a very strange behavior in IE. Lets assume that initially you have the following command to

Some words about JNDI

2010-06-14T03:27:00.000-07:00

I think all Java-developers know JNDI (Java Naming and Directory Interface) and all of them use it. The common case of its use is getting datasource and getting JMS queue. In this post I'd discuss usage of JNDI for custom objects.On one of our project we need to have access to one common knowledge base, which should be shared between several application deployed on this application server (it was

Improving GWT compilation speed

2010-06-08T23:49:00.000-07:00

Yesterday we have moved one of our projects from GWT 1.7 to GWT 2.0. And GWT compilation appeared to run slower on my host. So I've started looking for a way to make this process faster. The initial compilation of the project took 207 seconds and permutation compilation 170 seconds The main idea of speeding up compilation is to reduce the number of the compiled permutations. Permutation is a

Working with JCR in Magnolia-CMS

2010-06-08T07:34:00.000-07:00

Magnolia CMS is popular Java-based CMS, but unfortunately there is not enough documentation regarding it. For example, I decide to store and load some data into built-in JCR repository and I did not find guide for it. Thus I decided to create this post.So my goal is use JCR as storage for my custom data. I want to store data into it and load data.So let's start. First I'd to get Content and then

Some words about domain name scams

2010-06-04T04:00:00.000-07:00

Yesterday we received a letter with such content: (If you are NOT CEO,please forward this to your CEO, because this is urgent.Thanks.) Dear CEO, We are the department of registration service in China. we have something need to confirm with you. We formally received an application on Jun. 2, 2010, One company which self-styled "Mintor(Japan)Venture Capital Co.,Ltd" are applying to register(

Symbian C++. Installing environment

2010-06-03T22:38:00.000-07:00

System RequirementsHost OS Windows XP SP2 CPU Speed 1.8 GHzPC Memory 2GB RAMHDD 4 Gb +Note: The latest versions of the Symbian OS tools and SDKs are fully compatible with Windows Vista. However, because Vista has tighter security than XP, you have to take extra precautions during installation (link)Development environmentin this order:ActivePerl. There are a lot of articles

About Agile Testing

2010-06-02T03:58:00.000-07:00

Book 'Agile Testing' of Lisa Crispin & Janet Gregory in my interpretation. Basic ideas, concepts…To begin I remind Agile Manifesto:We are uncovering better ways of developingsoftware by doing it and helping others do it.Through this work we have come to value:Individuals and interactions over processes and toolsWorking software over comprehensive documentationCustomer collaboration over

Scala development in NetBeans

2010-05-27T01:40:00.000-07:00

Functional languages are cool in terms of making application parts running in parallel. This brings you great scalability of appllication when running on multicore systems or in cloud. So I've started looking at the direction of Scala which is based on Java and adds all benefits of the functional programming. I plan to see how Java integrates with Scala and vice versa in the next post. This one

JavaRebel 3.0.1

2010-05-25T06:39:00.000-07:00

Listened to one of the javaposse podcasts which includes interview with JavaRebel developers. I've already described JavaRebel before. This time I've decided to have a deep look at this tool and may be adopt it for the daily usage. JavaRebel is a nice tool which in nutshell is an very smart classloader. It allows you to change classes running in the container on the fly. It covers fields not

Model – View – Controller (MVC)

2010-05-10T07:52:00.000-07:00

MVC is very old and very famous design pattern. It is used in web and desktop applications, in different programming languages (C++, Java, .NET, Python, etc.).First I read about it in Design Patterns. Elements of Reusable Object-Oriented Software and since that time I have heart a lot of things about it and see a lot of realization of this pattern. I decide to write this post thanks to statement

JasperReports: Boxing/unboxing errors during template compilation

2010-05-10T05:51:00.000-07:00

When you try to compile the report with the statement like you'll get the errors like: 1. Cannot cast from boolean to Boolean The reason is that by default compliance with very low JDK versions is used. Something like 1.2 or 1.3. So lets migrate compilation of JasperReports templates to Java 5. JasperReports uses