JBlogger

Expert Opinions on Java, Web & Mobile Technologies

[objexinc-blog]

Javascript RESTful client call using jQuery

$.ajax({      type: 'POST',      url: 'http://fscebook.comxa.com/index.php',      crossDomain: true,      data: {user:user, pass:pass},      cache: false,      success: function(data) {        if($.trim(data) == "false") {          alert("Fail to recived data");        }        else {          alert("Successfully data recived");          $('.results').html(data);        }      }    });

[objexinc-blog]

Git Conflict Resolution

grep -lr '<<<<<<<' .

git checkout --ours PATH/FILE

OR

grep -lr '<<<<<<<' . | xargs git checkout --ours

git status

git commit -am "MSG"

[objexinc-blog]

Java code example to generate a QR Code.

Java code example to generate a QR Code. Code is dependent on this jar: com.google.zxing core 3.2.1 import java.awt.Color; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.util.Hashtable; import javax.imageio.ImageIO; import com.google.zxing.BarcodeFormat; import com.google.zxing.EncodeHintType; import com.google.zxing.WriterException; import com.google.zxing.common.BitMatrix; import com.google.zxing.qrcode.QRCodeWriter; import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; public class QRTester { // Tutorial: https://github.com/Slackify/zxing public static void main(String[] args) { String myCodeText = “Mazhar Choudhry”; // change path as per your laptop/desktop location String filePath = "/temp/myQR.png"; int size = 125; String fileType = "png"; File myFile = new File(filePath); try { Hashtable hintMap = new Hashtable(); hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L); QRCodeWriter qrCodeWriter = new QRCodeWriter(); BitMatrix byteMatrix = qrCodeWriter.encode(myCodeText, BarcodeFormat.QR_CODE, size, size, hintMap); int CrunchifyWidth = byteMatrix.getWidth(); BufferedImage image = new BufferedImage(CrunchifyWidth, CrunchifyWidth, BufferedImage.TYPE_INT_RGB); image.createGraphics(); Graphics2D graphics = (Graphics2D) image.getGraphics(); graphics.setColor(Color.WHITE); graphics.fillRect(0, 0, CrunchifyWidth, CrunchifyWidth); graphics.setColor(Color.BLACK); for (int i = 0; i < CrunchifyWidth; i++) { for (int j = 0; j < CrunchifyWidth; j++) { if (byteMatrix.get(i, j)) { graphics.fillRect(i, j, 1, 1); } } } ImageIO.write(image, fileType, myFile); } catch (WriterException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } System.out.println("\n\nYou have successfully created QR Code."); } }

[objexinc-blog]

Injectable Date utility class using Java 8 Java.time API

import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.time.LocalDateTime; import java.time.ZoneId; import java.time.format.DateTimeFormatter; import java.time.format.DateTimeParseException; import java.util.Date; import javax.inject.Named; @Named public class DateUtil { private static final Logger log = LoggerFactory.getLogger(DateUtil.class); public Date convert(String dateStr) { try { DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MMM dd, yyyy HH:mm:ss"); LocalDateTime dateTime = LocalDateTime.parse(dateStr, formatter); Date date = Date.from(dateTime.atZone(ZoneId.systemDefault()).toInstant()); return date; } catch(DateTimeParseException e) { log.error("error converting date, message: {}: ", e.getMessage(), e); } return null; } }

[objexinc-blog]

Installing Solr web app within Eclipse IDE and TomEE server

1. Copy solr.war from downloaded and unzipped solr folder to your app server (i.e., TomEE) webapps directory; 2. Double click on your server, select ‘open launch configuration’ and add a pointer to your future solr data directory: “-Dsolr.solr.home=c:/solr” (without quotes); 3. Copy contents of ‘solr’ directory from downloaded folder to your newly created solr directory i.e., ‘c:/solr’; 4. Start the server and enjoy a new Solr installation on localhost address i.e., http://localhost:8080/solr.

[objexinc-blog]

Convert OVA (Open Virtual Appliance, standard format for virtual machines) vm file to PVM

http://aspyct.org/blog/2012/08/17/open-ova-files-with-parallels/

[objexinc-blog]

Bugs are Tasks - Eclipse Mylyn integrations with Issue Tracking Systems

Mylyn plugin comes already installed in your Eclipse. You can use the plugin to sync bugs/issues/tasks in Eclipse. Then you can work in context aware environment where switching from artifacts to artifacts (based on your task selection) without leaving your IDE is possible... cool, isn't it?

This is how you can integrate your builtin Mylyn tasks view with an issue tracking system. I'm using #Trac issue tracking system installed on a server.

Add tasks and task repository 'views' from Eclipse Window— Show View list and then add your repository i.e., Bugzilla or Trac 

Provide your authentication credentials and you're ready to live your dream :-)

Enjoy Integrated Development Environment :-)

Mazhar Choudhry is founder and CEO of Objex, Inc. A Java Enterprise Consulting company Headquartered in Ottawa Canada. Mazhar can be reached at:

[objexinc-blog]

Simple, Elegant and Free Issue Tracking System - Trac by Edgewell

I was evaluating issue tracking systems in the past week... looking for a free solution that can integrate with Eclipse Tasks, where me and my team spend most our time.

Google search presented me with Trac software by Edgewell Software company and tried installing the software on my Mac Server using their prescribed method: http://trac.edgewall.org/wiki/TracOnOsx

I also tried this link: http://www.dssw.co.uk/blog/2012/10/16/how-to-install-trac-on-mac-os-x/

It was quite complicated and cumbersome, I wasn't able to make it work with authentication.

Then I found an interesting installer, BitNami Trac Installer: http://bitnami.com/stack/trac

Apparently their objective is to throw installation caveats under the carpet and provide a clean installer that will do everything (kinda) for you.

I was able to install Trac Issue Tracking system with builtin DB using BitNami installer in matter of minutes. I had to comment out following two modules in apache config file after the installation:

Also I disabled these 2 modules after the installation since I wasn't interested in SVN integration: LoadModule dav_svn_module modules/mod_dav_svn.so LoadModule authz_svn_module modules/mod_authz_svn.so

Have fun playing with state-of-the-art and absolutely free issue tracking system!!

Mazhar Choudhry is founder and CEO of Objex, Inc. A Java Enterprise Consulting company Headquartered in Ottawa Canada. Mazhar can be reached at:

[objexinc-blog]

Java App Configuration — Properties Alternative

Download Apache Commons Configuration 

Believe me it's awesome!!

Create you your XML configuration file and keep it in same package to make life simple:

<?xml version="1.0" encoding="UTF-8"?> <!-- data.xml --> <config> <local> <url>http://localhost:8080</url> </local>

<dev> <url>http://example.com</url> </dev> </config>

Notice I'm configuring both local and dev environment is same file, cool!

And load it:

try { config = new     XMLConfiguration(SolrConfig.class.getResource("data.xml")); EnvironmentConfiguration config = new EnvironmentConfiguration(); env = config.getString("env"); // Environment if (env==null) { env = "local"; // by default it's local } logger.info("'"+env+"' Environment detected!"); } catch (Exception e) { logger.severe("Configuration error: "+e.getMessage()); }

Note: you can access environment variables too and differentiate between various environments.

add a environment aware method to your code:

public String getProperty(String key) {     key = env.trim()+"."+key.trim();    return this.config.getString(key); }

And that's how you access the property within your xml configuration: config.getProperty("url")

Have Fun.

[objexinc-blog]

Lucene / Solr

Apache Lucene is a high-performance, full-featured text search engine library written entirely in Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform.

Apache Lucene is an open source project available for free download. Please use the links on the right to access Lucene.

Solr is written in Java and runs as a standalone full-text search server within a servlet container such as Jetty. Solr uses the Lucene Java search library at its core for full-text indexing and search, and has REST-like HTTP/XML and JSON APIs that make it easy to use from virtually any programming language. Solr's powerful external configuration allows it to be tailored to almost any type of application without Java coding, and it has an extensive plugin architecture when more advanced customization is required. 

[objexinc-blog]

Off-Site

Off-Site Software development is providing software development services by a supplier located in a different location from the one where the software will be used.

The main reason behind companies using off-site software development services is the higher development cost of the local service providers. 

[objexinc-blog]

Architecture

Software architecture is high level structures of a software system. It can be defined as the set of structures needed to reason about the software system, which comprise the software elements, the relations between them, and the properties of both elements and relations.

The term software architecture also denotes the set of practices used to select, define or design a software architecture.

[objexinc-blog]

Support

Software technical support services attempt to help the user solve specific problems with software product. 

Objex not only provide software development services, we also stand behind our software and provide efficient and quality support services.

[objexinc-blog]

Development

The term "software development" refer to the activity of computer programming, which is the process of writing and maintaining the source code, but in a broader sense of the term it includes all that is involved between the conception of the desired software through to the final manifestation of the software itself.

[objexinc-blog]

Prototyping

Using prototype, the software designer and implementer can get valuable feedback from the users early in the project. The client and the contractor can compare if the software made matches the software specification, according to which the software program is built.

It also allows the software engineer some insight into the accuracy of initial project estimates and whether the deadlines and milestones proposed can be successfully met. The degree of completeness and the techniques used in the prototyping have been in development and debate since its proposal in the early 1970s.[6]

[objexinc-blog]

Design

Software design usually involves problem solving and planning a software solution. This includes both low-level component and algorithm design and high-level, architecture design.

[objexinc-blog]

Blackberry 10

Blackberry 10 is based on QNX which was acquired by BlackBerry in April 2010. BlackBerry 10 is the third major release of a QNX based operating system, following the release of BlackBerry Tablet OS with the BlackBerry PlayBook on April 19, 2011,[7] and BlackBerry Tablet OS version 2.0 on February 21, 2012.[8] BlackBerry 10 and BlackBerry Tablet OS have numerous technical similarities, with BlackBerry 10 providing substantial enhancements over the earlier releases.