Technical Blog

Javascript Graph Libraries

2011-05-19T14:41:00.001-07:00

Following are nice Javascript Libraries which can be used for web applications

JQPlot http://www.jqplot.com/
Sparklines http://omnipotent.net/jquery.sparkline/
Protovis
JQuery Flot

Good Links

2009-12-09T06:04:00.001-08:00

http://www.cs.utexas.edu/users/EWD/welcome.html
http://c2.com
http://www.infoq.com/presentations/metaprogramming-ruby

http://www.rubyrailways.com/the-top-10-rubyrails-blogs/
http://rubyinside.com
http://javascript.crockford.com/

SEO good links

2009-12-09T06:00:00.001-08:00

http://www.seowhitehats.com/2009/12/04/10-seo-facebook-tips.html
http://research.microsoft.com/pubs/81492/fp083-fetterly.pdf
http://www.cond.org/resonance-final-submit.pdf
http://research.microsoft.com/pubs/80233/sigir022-konig.pdf

Restful services good links

2009-12-09T05:59:00.001-08:00

the source of truth
http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm -

less intense

http://www.infoq.com/articles/rest-introduction
http://www.infoq.com/news/2009/06/rest-ts
http://www.infoq.com/articles/webber-rest-workflow

http://iansrobinson.com/2009/07/16/how-do-you-link/

PDF
Rest in Practice by Jim webber and Ian Robinson

http://tools.ietf.org/html/rfc5023#section-10
http://code.google.com/apis/gdata/docs/2.0/reference.html#Queries a

2009-12-08T20:12:00.001-08:00

Started working on rails project on nov 2, 2009. it is been fun. it is jruby + java.

uses lucene as search engine, planning to use apache solr and acts as solar plugin ruby

seeing compilation errors for procedures in oracle

2009-10-07T05:05:00.001-07:00

c:>sqlplus -S -L user/password@sid @x.sql
then type show error

NHibernate.AssertionFailure was unhandled possible nonthreadsafe access to session

2009-09-11T02:02:00.000-07:00

One of our project we faced this issue, my teammates and i worked to reproduce this.

How to Reproduce -

namespace NHibernatePossibleThreadIssue
{
public class Program
{
private static ISession Session;

public static void Main(string[] args)
{
Configuration conf = new Configuration();
IDictionary properties = new Dictionary
{
{"hibernate.connection.driver_class", "NHibernate.Driver.OracleClientDriver"},
{"hibernate.connection.connection_string", "Data Source=XE; user ID=sso; Password=sso"},
{"hibernate.dialect", "NHibernate.Dialect.Oracle9Dialect"},
{"hibernate.show_sql", "true"}
};

conf.SetProperties(properties);
conf.AddClass(typeof (SomeDomain));
conf.AddClass(typeof (SomeChild));
ISessionFactory factory = conf.BuildSessionFactory();

Session = factory.OpenSession();
LoadInSessionTwice();

//ConfigureCastle();

//TryThreading();
Console.ReadKey();

}

private static void LoadInSessionTwice()
{

SomeDomain domain = Session.Load(91286L);
IQuery query = Session.CreateQuery(" from SomeDomain d where d.desc= :desc ");
query.SetParameter("desc", "helloworld");
SomeDomain evicted = query.List()[0];

Session.Evict(evicted);
Session.Flush();

}

Mapping and domain classes

public class SomeDomain
{
public long id { get; set; }
public string desc { get; set; }

private SomeChild child;

public SomeChild Child
{
get
{
if (child == null)
child = new SomeChild {Domain = this};

return child;
}
set { child = value; }
}

}

public class SomeChild {

public long Id { get; set; }

public SomeDomain Domain { get; set;}

public string description { get; set; }

}

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="NHibernatePossibleThreadIssue">
<class name="NHibernatePossibleThreadIssue.SomeDomain" lazy="false" table="SOMEDOMAIN">
<id name="id" type="long" column="ID" unsaved-value = "0" >
<generator class="native">
<param name="sequence">COR_SEQ</param>
</generator>
</id>
<property name="desc" column="text"/>
<one-to-one name="Child"
class="NHibernatePossibleThreadIssue.SomeChild" cascade="all-delete-orphan"/>

</class>
</hibernate-mapping>

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="NHibernatePossibleThreadIssue">
<class name="NHibernatePossibleThreadIssue.SomeChild" lazy="false" table="SOMECHILD">
<id name="Id" column="SD_ID">
<generator class="foreign">
<param name="property">Domain</param>
</generator>
</id>
<one-to-one name="Domain" class="NHibernatePossibleThreadIssue.SomeDomain" constrained="true"/>
<property name="description"/>
</class>
</hibernate-mapping>

NHibernate and Session Flushing

2009-09-10T21:12:00.000-07:00

We have some bad code in our application which was using same hibernate session across multiple threads. We were not flushing the session, but data was still getting saved in database.

The reason was when first thread use to save, data was in hibernate session, but when second thread was trying to read a data using same hibernate session, hibernate was flushing the data in its session, thus it was not possible to find this error from UI as first requests data even though not saved in DB, will be seen in second request because second request is going to make hibernate session flush the data as it was read data request.

Learning Scala

2009-09-10T21:10:00.000-07:00

We had first hands on session on Scala 10 Sept,2009, a functional programming language, here is simple example which adds all numbers upto 1000 which are multiple of 3 or 5.

package test

object Example1 extends Application {

val answers =(1 until 1000).filter {eachNumber => eachNumber%3==0 || eachNumber%5==0}
val sum = answers.foldLeft(0) { _+ _ }
println(sum)

}

Using RSA private-public key with c# app for decyption(server) and java app for encryption(client)

2009-09-08T07:17:00.000-07:00

Using RSACryptoServiceProvider (c#) we created public and private key pair. Public key is then used by Java client to encrypt data and corresponding private key is used by c# server to decrypt data encrypted by java client

Java client encryting message with public key as following xml

<rsakeyvalue><modulus>z3iQSLN4e7LEZDkb6QSvHXXmQuMRPOYpP6R18WflUGMUk38xGEwd6ieO5DqpqdLnQ+GafFuKOnnPv9wXSuGX0xb9mTgaKQJX0LJSFKHc8G7A511UYn2wuOBDnRSOB09GcPa4T/CYjdP1MRxMecwL2eZ7BJWHU94TtBxfe0soQf0=</modulus><exponent>AQAB</exponent>

public class RSATest {

public static void Encrypt() throws Exception {

Cipher rsa = Cipher.getInstance("RSA");

KeyFactory keyFactory = KeyFactory.getInstance("RSA");

byte[] modulusBytes = new BASE64Decoder().decodeBuffer("z3iQSLN4e7LEZDkb6QSvHXXmQuMRPOYpP6R18WflUGMUk38xGEwd6ieO5DqpqdLnQ+GafFuKOnnPv9wXSuGX0xb9mTgaKQJX0LJSFKHc8G7A511UYn2wuOBDnRSOB09GcPa4T/CYjdP1MRxMecwL2eZ7BJWHU94TtBxfe0soQf0=");
byte[] exponentBytes = new BASE64Decoder().decodeBuffer("AQAB");

BigInteger modulus = new BigInteger(1, modulusBytes);
BigInteger exponent = new BigInteger(1, exponentBytes);

RSAPublicKeySpec keySpec = new RSAPublicKeySpec(modulus, exponent);
PublicKey publicKey = keyFactory.generatePublic(keySpec);

rsa.init(Cipher.ENCRYPT_MODE, publicKey);

byte[] encryptedData = rsa.doFinal("password would workahdsasdfiosfadioasdio".getBytes(new US_ASCII()));

String encryptedString = HexConversions.bytesToHex(encryptedData);
System.out.println(encryptedString);
System.out.println(encryptedString.length());

}

public static void main(String []arg) throws Exception {
Encrypt();
}
}

C# Code to decrypt what was encrypted by java client

using System;
using System.Globalization;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace ConsoleApplication1
{
internal class Program
{
private static RSACryptoServiceProvider rsa;
private static string publicKey;
private static string privateKey;

private static void Main(string[] args)
{
GenerateKeys();
string encryptedPassword = EncryptData();

string decryptedPassword =

DecryptData("57851E00296519064288CF5B014FE478B703D046648D8F3DEFE715C424670E63F6EFBDC2D7964E17C7C7618EF206F46871536184663725F2EB16FBE9E76872D1

2977F50EE2BDC2C6289A4FBC3C4DA48ED85F12734F97170BA1670BAF610FBA5DB407B18A98CECAA9EFEC4D48C5FA13B4AB771029239B501BB5CCC6235E4041F6");

Console.WriteLine(decryptedPassword);
Console.ReadKey();
}

private static string DecryptData(string encryptedPassword)
{
RSACryptoServiceProvider clientRSAProvider = new RSACryptoServiceProvider();
clientRSAProvider.FromXmlString(File.ReadAllText("D:\\wsgCertificates\\privateKey.txt"));
byte[] bytes = new byte[encryptedPassword.Length/2];
for (int i = 0; i < encryptedPassword.Length; i += 2)
{
bytes[i/2] = byte.Parse(encryptedPassword.Substring(i, 2), NumberStyles.HexNumber);
}

byte[] decrypt = clientRSAProvider.Decrypt(bytes, false);
return Encoding.ASCII.GetString(decrypt);
}

public static string EncryptData()
{
RSACryptoServiceProvider clientRSAProvider = new RSACryptoServiceProvider();
clientRSAProvider.FromXmlString(publicKey);

byte[] encrypt = clientRSAProvider.Encrypt(Encoding.ASCII.GetBytes("hi tesint aaaaaaaaassword"), false);
StringBuilder stringBuilder = new StringBuilder();
foreach (var byteValue in encrypt)
{
stringBuilder.Append(byteValue.ToString("X2"));
}
return stringBuilder.ToString();
}

public static string EncryptDataDSA()
{
DSACryptoServiceProvider clientRSAProvider = new DSACryptoServiceProvider();
clientRSAProvider.FromXmlString(publicKey);

byte[] encrypt = clientRSAProvider.SignData(Encoding.ASCII.GetBytes("hi tesint aaaaaaaaassword"));
StringBuilder stringBuilder = new StringBuilder();
foreach (var byteValue in encrypt)
{
stringBuilder.Append(byteValue.ToString("X2"));
}
return stringBuilder.ToString();
}

public static void GenerateKeys()
{
RSACryptoServiceProvider rsaCryptoServiceProvider = new RSACryptoServiceProvider();
publicKey = rsaCryptoServiceProvider.ToXmlString(false);
privateKey = rsaCryptoServiceProvider.ToXmlString(true);
WriteKey(publicKey, "D:\\wsgCertificates\\publicKey.txt");
WriteKey(privateKey, "D:\\wsgCertificates\\privateKey.txt");
}

private static void WriteKey(string key, string keyFileName)
{
StreamWriter writer = new StreamWriter(keyFileName);
writer.WriteLine(key);
writer.Close();
}
}
}

NHibernate pagination returning same records on different pages

2009-07-13T03:06:00.000-07:00

Oracle uses rownum for paginating queries. If order by clause can not unique order records ie. if all records have same first , last name and we are ordering by first,last name, then different pages may get same records.
here is good post

http://www.oracle.com/technology/oramag/oracle/06-sep/o56asktom.html

WCF Web service and Java Axis client - Message level security with certificates.

2009-05-21T05:36:00.000-07:00

We were facing issue with Axis 2 client talking to WCF service protected using message level security.

Note that client will sign message using its private key and encrypt using server's public key while server while sending response will sign with his private key and encrypt using clients public key

Solution -
We tried using Test certificate which has DN = "Test" as server's private key and it worked fine.

we configured wcf webservice with private key of test.pfx and java axis client with public key of test.pfx. We used verisign original certificate as client private key.

Request has
CN=Test

Response has

CN=VeriSign Class 2 MPKI Individual Subscriber CA - G2, OU=Terms of use at https://www.verisign.com/rpa (c)08, OU=VeriSign Trust Network, O="VeriSign, Inc.", C=US

2)
By using verisign certificate, we also tried using instead of in client policy file , but got same exception on WCF side,

3)

We looked at java axis source code, to see how it contructs X509IssuerName in soap message, code says that is follows RFC 2253 (http://www.ietf.org/rfc/rfc2253.txt) , so it seems that Java axis is normalizing the IssuerName as per rfc 2253 i.e No spaces after comma between CN and OU and so on. Also it uses \ to esacpe comma inside O=VeriSign, Inc. as per rfc 2253

e.g (CN=VeriSign Class 2 MPKI Individual Subscriber CA - G2,OU=Terms of use at https://www.verisign.com/rpa (c)08,OU=VeriSign Trust Network,O=VeriSign\, Inc.,C=US),

So it seems that wcf does not support above normalization

----------------------------
Client - Axis-2 Version 1.3 with Rampart version 1.3

Service - WCF Service with message level security on .Net3.5 service SP1

Web.config of WCF Web Service is

1.

We are trying to consume above WCF web service which is using Message Level Security [using client and server certificates.]. WCF service throws Soap Fault exception saying " An error occurred when verifying security for the message.".

After enabling message level logging on WCF service, we see following error in event viewer:

Message authentication failed.
Service: http://xxx/Gateway/v2.0/Authentication.svc
Action: http://xxxxxx/v2.0/Authentication/Login
ClientIdentity:
ActivityId:
MessageSecurityException: The EncryptedKey clause was not wrapped with the required encryption token 'System.IdentityModel.Tokens.X509SecurityToken'.

Soap message created by Axis2 client is

2009-03-17T11:21:36.389Z
2009-03-17T11:26:36.389Z

C=US,O=VeriSign\, Inc.,OU=VeriSign Trust Network,OU=Terms of use at https://www.verisign.com/rpa (c)08,CN=VeriSign Class 2 MPKI Individual Subscriber CA - G2

42434585466876238486390762643181460020

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eBGKWaYf2Czj2xvQz0kBMUVF891KxNks1e6dnWnw5pbtmLi3YERp7mVsX8W4ly9SKyyauRrU01rN
Jyhay2VdNW6p+9yFqpFlTxp3eoLnZiFnIHrWv+4GHl0l

2.

We are able to consume same WCF service using wcf client using same server and client certificates.

The soap message in this case is

2009-03-17T10:59:20.389Z
2009-03-17T11:04:20.389Z

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

CN=VeriSign Class 2 MPKI Individual Subscriber CA - G2, OU=Terms of use at https://www.verisign.com/rpa (c)08, OU=VeriSign Trust Network, O="VeriSign, Inc.", C=US
42434585466876238486390762643181460020

vNsqCQ9ot1eUnwAyVcLaMG7csmW3wgNWUh5QgaLCCoIs2UQOj3DTJTGeEVqvHvtuUIFwQgTo54Nww5GMvw/L9P092h/k+iJcdvUmsLD7jojtwnMhpzwY7Efv55rEpqQ5jr4pVPMiWfHYZLOv0zbMRDrNtXhekLAs/LXGc0DTfNhmdMD0Blwblhp+zt11rl6KECxjc54Lrjh2p9D7BEt2vZsxIVjSoqXB0JECa7D/JJgcREolgvCqVqPZgdSTneu2fxiWggz8vwn1IDMY0IKE40I/M/i1x4OHiUIL2Mh+TJAbJ9MNlq0GZozpAHXEZodQhvfV9AsRxKV0I3d4sr9XDA==

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

oyC2PSwlp8TIha3tY+tRq8RtgWEcPZ70u0RhRNqh17SgypTgrPX0kb2c+8Jll4syP26D/2i/tLznQncm6WITxbX1R/CmaYx0V/EmnONeig4GW6HCwkKpt3+DVZRprnbEMRlnyUEPxrK9eEKVE9Jbq1HaRjMCIM1ELk+2I349MTWEQfc3nv+vPVjPPlvh9C7VdKE6wk797dhW7a9xb83WlLMnR43vQ2ZlO07ORECExDqIcInAzpeeVkOrOsbklGtXa8WNP4Z3+BgjCf9p5BlVDQ==

Wcf client app.config is:

3.
Using same Axis2 client and same certificates, we are able to talk to Sample Axis2 Web service [which uses same certificates] successfully, That means certificates are right and soap evelope produced by Axis 2 client is understood by Axis Service and same soap envelope is not understood by WCF service.

So there seems some interoperability issue ??
There also seems some difference between X509IssuerName element in soap envelope genreated by Axis 2 Java client and WCF .net clien

Nhibernate querying oracle sequence

2009-05-07T22:27:00.000-07:00

Use follwoing to get nextval of oracle sequence from hibernate

using (ISession session = //Get Nhibernate session)
{
var sqlQuery = session.CreateSQLQuery(query).AddScalar("NEXTVAL", NHibernateUtil.UInt64);

object result = sqlQuery.UniqueResult();

return Convert.ChangeType(result,typeof(long));

}

Enter Key not working in IE if form has one passport type input field

2009-04-08T23:50:00.000-07:00

We have a form in which there is only one input field with type="password" and One Button of type "Submit".
In firefox when I am in password input field and press enter key it submits the form. But in case of IE it was not submitting the form.

Fix:
Added following code to form

Extension methods

2009-03-23T22:45:00.000-07:00

namespace LearnCSharp
{
public class MyClass
{
public void doWork()
{

}
}

static public class MyClassExt
{
static public void extentionMethod(this object myclass)
{

}
}

public class UseIt
{
public void Yahoo()
{
new MyClass().doWork();
MyClass myClass = new MyClass();
myClass = null;
myClass.extentionMethod();
string s = null;
s.extentionMethod();
}

wsHttping Binding WCF service

2009-03-23T07:51:00.000-07:00

I was helping out some of my team mates to get WCF webservice using wsHttpBinding working when called using Axis 2 client.

They were trying to send some huge xml data(as string) as parameter of web method. They could not use basicHttpBinding because it has limit of 7 KB or something.

Wcf client generated using svcutil was working fine, but Axis2 client was not working. We then used tcptrace and looked at Soap envelope which is generated by Axis 2 client and wcf client. We found that one generated by Axis did not have soap addressing header.

So after enabling Axis 2 addressing module , we could get Axis2 client working with WCF .net service using wsHttpBinding.

2009-03-19T23:43:00.000-07:00

I started working on .net project since last 8 months. Delegate is something interesting

[TestFixture]

Example 1: Simple Delegate

public class DeletegateTest

private delegate int MyDelegate(string some);

[Test]
public void SampleTest()
{

doWork(mydelegatemethod);

}

private int mydelegatemethod(string s)
{
Console.WriteLine("I got:" + s);
return 1;
}

private void doWork(MyDelegate del)
{
del("sandeep");
}

}

Example 2: Same Simple Delegate Simplified

TestFixture]
public class Delete
{

private delegate int MyDelegate(string some);

[Test]
public void SampleTest()
{
doWork(mydelegatemethod);
}

private int mydelegatemethod(string s)
{
Console.WriteLine("I got:" + s);
return 1;
}

private void doWork(MyDelegate del)
{
del("sandeep");

}

}

Example 3: Same example With Lamda

[TestFixture]
public class Delete
{

private delegate int MyDelegate(string some);

[Test]
public void SampleTest()
{
doWork((s) =>
{
Console.WriteLine("I got:" + s);
return 1;
});
}

private void doWork(MyDelegate del)
{
del("sandeep");

}

}

Example 4: With Anonymous method

[TestFixture]
public class Delete
{

private delegate int MyDelegate(string some);

[Test]
public void SampleTest()
{
doWork(delegate(string s)
{
Console.WriteLine("I got:" + s);
return 1;
});
}

private void doWork(MyDelegate del)
{
del("sandeep");

}

}

Web application developement.

2007-01-25T01:31:00.000-08:00

I have 8 years of experience in Web applicaiton development using J2EE. From my experience, it is easy and fast to develop web applicaitons using spring and hibernate. Though there is significant learning curve involved in getting hands on on spring and hibernate.