Subin The Coder

Custom transparent loading gif

noreply@blogger.com (Subin Sugunan) — Wed, 08 Feb 2012 18:24:45 PST

Nice and Easy way to create a custom transparent loading gif

http://www.ajaxload.info/

Charts4j Android Example

noreply@blogger.com (Subin Sugunan) — Sun, 22 Jan 2012 05:43:58 PST

Chart4J is a free, lightweight charts & graphs Java API. Like many developers I too find it difficult to start with it due to lack of a complete sample in the official site.

The basic idea behind Chart4J is to create a URL which should retrieve a chart from Google Chart Tools.

I've uploaded one complete sample in my Google code page which I used during ramp up in Android development. This sample will make use of one of the example code available in Chart4J.

You can checkout the project from here

You may check out a read-only working copy anonymously over HTTP.
svn checkout http://subin-the-coder.googlecode.com/svn/trunk/ subin-the-coder-read-only

Regular expression for Grep Console

noreply@blogger.com (Subin Sugunan) — Mon, 26 Dec 2011 07:15:44 PST

Grep Console is a very nice eclipse plugin but the documentation lacks proper regular expressions to be used with.

Below are few regex which I used during development

1) Fatal (.*)(FATAL)(.*)
2) Error (.*)(ERROR)(.*)
3) Info (.*)(INFO)(.*)
4) Debug (.*)(DEBUG)(.*)
5) Trace (.*)(TRACE)(.*)

java.net.SocketException: Too many open files

noreply@blogger.com (Subin Sugunan) — Tue, 20 Sep 2011 07:47:12 PDT

Some bits I'd like to share with the world: java.net.SocketException: Too many open files

Debugging and Testing Swing GUI

noreply@blogger.com (Subin Sugunan) — Sat, 06 Aug 2011 01:09:21 PDT

A nice tool for inspecting Swing UI.
http://www.swingexplorer.com/

Another one for Swing UI functional test automation.
http://code.google.com/p/fest/

Useful eclipse plugins

noreply@blogger.com (Subin Sugunan) — Wed, 03 Aug 2011 11:07:25 PDT

SVN
http://subclipse.tigris.org/

CheckStyle
http://eclipse-cs.sourceforge.net/

M2Eclipse
http://m2eclipse.sonatype.org/

AmaterasUML
http://marketplace.eclipse.org/content/amaterasuml

Findbugs
http://findbugs.sourceforge.net/

Jad Java decompiler plugin for Eclipse IDE.
http://sourceforge.net/projects/jadclipse/

Code coverage
http://www.eclemma.org

Resource Bundle Plugin
http://sourceforge.net/projects/eclipse-rbe/

EclipseMetrics
http://www.stateofflow.com/projects/16/eclipsemetrics

Fast Code eclipse plugin
http://fast-code.sourceforge.net/

TestNG
http://testng.org/doc/eclipse.html

EditBox
http://editbox.sourceforge.net/

Bravo JSP editor
http://bravo-jsp-editor.blogspot.com/

Jupiter
http://code.google.com/p/jupiter-eclipse-plugin/

Visual Editor Project for Swing/JFC and SWT/RCP
http://www.eclipse.org/vep/

SQLExplorer
http://www.sqlexplorer.org/

SourceHelper
http://hexapixel.com/projects/sourcehelper

Bytecode Outline plugin for Eclipse
http://asm.ow2.org/eclipse/index.html

Eclipse Test & Performance Tools Platform Project
http://www.eclipse.org/tptp/

Byecycle
http://byecycle.sourceforge.net/

Spring AOP Basics

noreply@blogger.com (Subin Sugunan) — Wed, 03 Aug 2011 10:57:45 PDT

1. Terms to remember in AOP

      Join Point– A point in the execution of a program such as a method call or field assignment
      Pointcut      – An expression that selects one or more Join Points
      Advice      – Code to be executed at a Join Point that has been      selected by a Pointcut
      Aspect      – A module that encapsulates pointcuts and advice

2. Defining a pointcut
syntax:

      execution()

      Here 'execution' is a keyword.

Syntax for defining Method Pattern

      [Modifiers] ReturnType [ClassType]      MethodName ([Arguments]) [throws ExceptionType]

      * -Any type but only one.
      .. -Zero or more
      + -This class or any of its derived class
      @ -With a particular annotation
      (@) -Annotation in the class which is being returned

      e.g
      execution(* com.coders.*Service.get*(..))

      The abouve Pointcut expression can be read as [Read from right to left]

      Any metod name which satisfies the following criteria.

      (..) -Method can have "Zero or more" parameters.
      get* -Method name should start with "get"
      *Service -Class name should end with "Service"
      com.coders -All classes in "com.coders" package
      * -Any return type

3. Type of Advices
      @Before
      @AfterReturning
      @AfterThrowing
      @After
      @Around [90% case we use this]

AOP in Spring 2.x
http://static.springsource.org/spring/docs/2.5.x/reference/aop.html

AOP in Spring 3.x
http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/htmlsingle/spring-framework-reference.html#aop

Online E4X Expression Tester

noreply@blogger.com (Subin Sugunan) — Mon, 25 Jul 2011 11:13:16 PDT

Very useful. Check this out.

http://www.linkwerk.com/pub/javascript/e4x/e4x-tester/

Check used and free RAM memory under Linux

noreply@blogger.com (Subin Sugunan) — Mon, 25 Jul 2011 11:00:00 PDT

One of the nice post I read on the same

http://www.cyberciti.biz/faq/linux-check-memory-usage/

Remote debugging JBoss inside eclipse

noreply@blogger.com (Subin Sugunan) — Mon, 25 Jul 2011 10:54:28 PDT

1. Modify run.bat

Add the following in the run.bat file [After this statement "set JBOSS_ENDORSED_DIRS=%JBOSS_HOME%\lib\endorsed"]

set JAVA_OPTS= -Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=y %JAVA_OPTS%

2. Run run.bat

Calling E:\dev-tools\jboss\jboss-6.0.0.Final\bin\run.conf.bat
===============================================================================

  JBoss Bootstrap Environment

  JBOSS_HOME: E:\dev-tools\jboss\jboss-6.0.0.Final

  JAVA: E:\dev-tools\java\jdk1.6.0_20\bin\java

  JAVA_OPTS:  -Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,address=8787,serve
r=y,suspend=y -Dprogram.name=debug-jboss-6-final.bat -Xms128M -Xmx512M -XX:MaxPe
rmSize=256M -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInter
val=3600000 -Dorg.jboss.resolver.warning=true -server

  CLASSPATH: E:\dev-tools\java\jdk1.6.0_20\lib\tools.jar;E:\dev-tools\jboss\jbos
s-6.0.0.Final\bin\run.jar

===============================================================================

Listening for transport dt_socket at address: 8787

It will wait for your instructions listening to port you specified. In this case 8787.

3. Create a debug configuration in eclipse

Go to debug perspective

Run->Debug configurations

Under Remote Java Applications
a. Crate new configuration
b. Give a name
c. Select your Project (war project)
d. Give ip (localhost) and port which JBoss is listening
(8787), not 8080 :)
e. Apply
f. Debug

Now JBoss will proceed with start up. And now the code in eclipse is connected to the code which is running in JBoss.

…….
  CLASSPATH: E:\dev-tools\java\jdk1.6.0_20\lib\tools.jar;E:\dev-tools\jboss\jbos
s-6.0.0.Final\bin\run.jar

===============================================================================

Listening for transport dt_socket at address: 8787

Listening for transport dt_socket at address: 8787
15:06:43,122 INFO  [AbstractJBossASServerBase] Server Configuration:

        JBOSS_HOME URL: file:/E:/dev-tools/jboss/jboss-6.0.0.Final/
        Bootstrap: $JBOSS_HOME\server/default/conf/bootstrap.xml
        Common Base: $JBOSS_HOME\common/
…

Add a break point somewhere in you code and invoke corresponding service in JBoss [Invoke from a web service client, Debug JUnit Test case etc].

Once execution finds a break point, it will stop there and bring eclipse up.

Now you know how to debug your code inside eclipse

"local" vs "ref" in Spring configuration

noreply@blogger.com (Subin Sugunan) — Sun, 24 Jul 2011 01:16:31 PDT

This is helpful when you have multiple configuration files.

When you say

"local" - Spring will look for the bean in the same file.
"ref" - Spring will look for the bean in all configuration files.

Remember ,Bean can have both "id" and "name" . You can specify dependencies using "id" OR "name" of a bean.

id - UNIQUE. can't have special characters.
name - UNIQUE. CAN have special characters

Spring proxy creation

noreply@blogger.com (Subin Sugunan) — Mon, 04 Jul 2011 10:26:29 PDT

Spring uses Dynamic proxy provided by JDK and CGLIB to create proxies, which will extend your class/implement you interface and add additional logic for pre processing and post processing of bean. CGLIB is more flexible and powerful than Dynamic proxy.

In Spring AOP ,

If a join point is on an interface - Spring use dynamic proxies
If a join point is in a class with no interface - Spring use CGLIB

Java Exception Concepts and Antipatterns

noreply@blogger.com (Subin Sugunan) — Sun, 19 Jun 2011 00:11:10 PDT

One if my friend send this link today. A must read for java guys..

http://today.java.net/article/2006/04/04/exception-handling-antipatterns#basic-exception-concepts

Tomcat 6: Default application

noreply@blogger.com (Subin Sugunan) — Sun, 29 May 2011 11:13:50 PDT

I often see people adding content to the "ROOT" directory inside "webapp" directory in Tomcat to make their application the default one.

But there is a better way to do that.

1. Open $TOMCAT_HOME/conf/server.xml

2. Add the following content inside tags

E.g.

3. Restart tomcat and you are done.

php mail with attachment

noreply@blogger.com (Subin Sugunan) — Mon, 18 Oct 2010 11:05:03 PDT

if ($_FILES["file"]["error"] > 0)
  {
  echo "Error: " . $_FILES["file"]["error"] . "
";
  }
else
  {
  //upload to 'upload foledr'
   move_uploaded_file($_FILES["file"]["tmp_name"],"upload/" . $_FILES["file"]["name"]);
  }

// get posted data into local variables
$name = Trim(stripslashes($_POST['name'])); 
$email =  Trim(stripslashes($_POST['email']));

  
// validation
$validationOK=true;
if (!$validationOK) {
  print "Error";
  exit;
}

// prepare email body text
$Body = "";
$Body .= "Name: ";
$Body .= $name;
$Body .= "
";
$Body .= "Email: ";
$Body .= $email;
$Body .= "
";


$to = "add an email id here";
$subject = 'add subject here';
$bound_text = "Multipart_Boundary_x";
$bound = "--".$bound_text."\r\n";
$bound_last = "--".$bound_text."--\r\n";

$headers = "From: ";
$headers .=$email;
$headers .="\r\n";

$headers .= "MIME-Version: 1.0\r\n"
  ."Content-Type: multipart/mixed; boundary=\"$bound_text\"";

$message .= "If you can see this MIME than your client doesn't accept MIME types!\r\n"
  .$bound;

    $content = $Body;

$message .= "Content-Type: text/html; charset=\"iso-8859-1\"\r\n"
  ."Content-Transfer-Encoding: 7bit\r\n\r\n"
  .$content."\r\n"
  .$bound;


//read file content
$file = file_get_contents("upload/" . $_FILES["file"]["name"]);

$message .= "Content-Type: application/text; name=\"". $_FILES["file"]["name"]."\"\r\n"
  ."Content-Transfer-Encoding: base64\r\n"
  ."Content-disposition: attachment; file=\"". $_FILES["file"]["name"]."\"\r\n"
  ."\r\n"
  .chunk_split(base64_encode($file))
  .$bound_last;


if(mail($to, $subject, $message, $headers))
{
  //delete temp file. once sent  
  $myFile = "upload/" . $_FILES["file"]["name"];
  unlink($myFile);

  print "Thank you.html";
} else {
  print "Error";
}

php mail script

noreply@blogger.com (Subin Sugunan) — Mon, 18 Oct 2010 10:57:47 PDT

// get posted data into local variables
$EmailFrom = Trim(stripslashes($_POST['email'])); 
$EmailTo = "add an email id here";
$Name = Trim(stripslashes($_POST['name'])); 
$Subject = "DATUMMOTORS: New Complaint";
$Email = Trim(stripslashes($_POST['email'])); 

$Comments = Trim(stripslashes($_POST['comments'])); 


//print($Name);

// validation
$validationOK=true;
if (!$validationOK) {
  print "Error.html";
  exit;
}

// prepare email body text
$Body = "";
$Body .= "Name: ";
$Body .= $Name;
$Body .= "\n";
$Body .= "Email: ";
$Body .= $Email;

$Body .= "\n";
$Body .= "Comments: ";
$Body .= $Comments;
$Body .= "\n";


// send email 
$success = mail($EmailTo, $Subject, $Body, "From: <$EmailFrom>");


// redirect to success page 
if ($success){
  print "Thank you.html";
}
else{
  print "Error.html";
}

Changing default port in JBboss 6

noreply@blogger.com (Subin Sugunan) — Mon, 04 Oct 2010 19:43:22 PDT

Open server.xml

..\jboss-6.0.0.20100911-M5\server\default\deploy\jbossweb.sar\server.xml

Search for Connector protocol="HTTP/1.1"

Now change it to what ever you want . e.g port="9090"

That's it , now restart the server.

Online JSON Editor

noreply@blogger.com (Subin Sugunan) — Thu, 30 Sep 2010 08:03:13 PDT

http://braincast.nl/samples/jsoneditor/

This editor allows for easy editing of json strings, after loading a sample from the dropdown list click 'build tree', expand the tree, click nodes and start changing!
Also try the xml2json functions for quickly converting xml to json.

Adobe Flex An Overview

noreply@blogger.com (Subin Sugunan) — Tue, 07 Sep 2010 10:09:39 PDT

An old presentation, which I used to introduce Rich Internet Applications and Adobe Flex to my friends.

Around 2 yrs old but good to serve the purpose.e

Adobe flex an overview

View more presentations from Subin Sugunan.

noreply@blogger.com (Subin Sugunan) — Mon, 30 Aug 2010 12:50:59 PDT

EJBs can be exposed as web services on a fly with EJB3. This is an introductory presentation about the same.

Exposing EJBs As Web Services

View more presentations from Subin Sugunan.

Easy code sharing with pastebin

noreply@blogger.com (Subin Sugunan) — Mon, 30 Aug 2010 11:57:10 PDT

A pastebin is a web application which allows its users to upload snippets of text, usually samples of source code, for public viewing.

pastebin.com provides syntax highlighting for over 150 languages

http://pastebin.com/

Web services and SOA

noreply@blogger.com (Subin Sugunan) — Thu, 26 Aug 2010 12:16:05 PDT

My personal note about SOAP and REST Web Services and SOA.
Many thanks to Sangeeth for his guidance and contribution.

Web services and SOA

View more presentations from Subin Sugunan.

Web Service Testing tools

noreply@blogger.com (Subin Sugunan) — Thu, 26 Aug 2010 09:34:37 PDT

Here are some handy tools for testing web services.

SOAP

SoapUI [http://www.soapui.org/]
Web Service Call Composer (Web Service Tester) [http://www.stylusstudio.com/ws_tester.html]
WebInject [http://www.webinject.org/]
JMeter [http://jakarta.apache.org/jmeter/]
SOAPSonar Personal Edition [http://www.crosschecknet.com/download/p_cust_info_try_p.php]
SOA Cleaner [http://xyrow.com/]
Vordel SOAPbox [http://www.vordel.com/products/soapbox/]
Storm [http://storm.codeplex.com/]

REST

SoapUI [http://www.soapui.org/]
SOA Cleaner [http://xyrow.com/]
rest-client [http://code.google.com/p/rest-client/]

FireFox Addons

Firebug [https://addons.mozilla.org/en-US/firefox/addon/1843/]
Poster [https://addons.mozilla.org/en-US/firefox/addon/2691/]
RESTClient [https://addons.mozilla.org/en-US/firefox/addon/9780/]
RESTTest [https://addons.mozilla.org/en-US/firefox/addon/5946/]
HTTP Resource Test [https://addons.mozilla.org/en-US/firefox/addon/15045/]

Along with this you must also know the tools like

Java2WSDL, WSDL2Java, Java2WADL and WADL2Java

in case you break your deployment with the Web service.

Entity Persistence with JPA

noreply@blogger.com (Subin Sugunan) — Tue, 17 Aug 2010 10:38:42 PDT

An introduction to Java Persistence API

Entity Persistence with JPA

View more presentations from Subin The coder.

Creating basic J2EE projects using maven

noreply@blogger.com (Subin Sugunan) — Sun, 29 Aug 2010 04:27:10 PDT

This post will show how to create basic j2ee projects using maven.

We’ll cover

1.    Java project   (subin-java-project)
2.    EJB project   (subin-ejb-project)
3.    Web project (subin-web-project)
4.    EAR project (subin-ear-project)

1. Creating java project using maven

   mvn archetype:create -DgroupId=com.subin -DartifactId=subin-java-project

   Create the following directories and files manually

   subin-java-project\src\main\resources\
   subin-java-project\src\main\resources\log4j.xml (If you need log4j support. See log4j site for details)

Update pom.xml sample is shown below

 

  4.0.0
  com.subin
  subin-java-project
  jar
  1.0-SNAPSHOT
  java-project
  The java-project: Includes all common service and
   interface definitions.
  http://www.subinsugunan.com/

2. Creating EJB project using maven

mvn archetype:create -DgroupId=com.subin -DartifactId=subin-ejb-project

Update pom.xml sample is shown below


 4.0.0
 com.subin
 subin-ejb-project
 ejb
 1.0-SNAPSHOT
 subin-ejb
 The EJB project: Includes EJB/WebService implementation
  logic.
 http://www.subinsugunan.com/

 
  
   com.subin
   subin-java-project
   ${project.version}
   jar
  
  
   javaee
   javaee-api
   5
   provided
  
 

 
  
   
    src/main/resources
    
     **/*
    
   
  

  
   
    org.apache.maven.plugins
    maven-ejb-plugin
    
     
      
       true
      
     
     3.0

3. Creating web project using maven

    mvn archetype:create -DgroupId=com.subin -DartifactId=subin-web-project -DarchetypeArtifactId=maven-archetype-webapp

      Create the following directories and files manually
      subin-web-project\src\main\java

Update pom.xml sample is shown below




 4.0.0
 com.subin
 subin-web-project
 1.0-SNAPSHOT
 The Web project
 war
 subin-war
 http://www.subinsugunan.com/

 
  
   com.subin
   subin-java-project
   ${project.version}
   jar
  
  
   javax.servlet
   servlet-api
   2.4
   provided
  
  
   javax.servlet.jsp
   jsp-api
   2.0
   provided

4. Creating EAR project using maven

    mvn archetype:create -DgroupId=com.subin -DartifactId=subin-ear-project

      Create the following directories and files manually
            subin-ear-project\src\main\application
            subin-ear-project\src\main\application\META-INF
            subin-ear-project\src\main\application\META-INF\MANIFEST.MF
            subin-ear-project\src\main\application\WEB-INF

Update pom.xml sample is shown below

 
  4.0.0
  com.subin
  subin-ear-project
  ear
  1.0-SNAPSHOT
  subin-ear-project
  The EAR project: Used to create enterprise archive.
  
  http://www.subinsugunan.com/

  
   
    com.subin
    subin-java-project
    ${project.version}
    jar
   
   
    com.subin
    subin-ejb-project
    ${project.version}
    ejb
   
   
    com.subin
    subin-web-project
    ${project.version}
    war