Java Database Connectivity (JDBC)

Hi guys , i had posted a DataSource question before...but i was able to figure that out. My new problem is that i cant get the DataSource object in my java program and the following error is thrown.
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java.lang.NoClassDefFoundError: com/ibm/ejs/ras/TraceElement
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:212)
at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:46)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:656)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:247)
at javax.naming.InitialContext.init(InitialContext.java:223)
at javax.naming.InitialContext.<init>(InitialContext.java:199)
at DataSourceCheck.main(DataSourceCheck.java:27)
Exception in thread "main"
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Here is my Java program :

import java.sql.*;
import javax.naming.*;
import java.util.*;

class DataSourceCheck
{

public static void main(String[] args)
{
javax.sql.DataSource myDataSource= null;
try
{

String initialContextFactory = "com.ibm.websphere.naming.WsnInitialContextFactory";
String providerURL = "iiop://localhost:8081";

java.util.Properties props = new java.util.Properties();
props.put(Context.INITIAL_CONTEXT_FACTORY, initialContextFactory);
props.put(Context.PROVIDER_URL, providerURL);
Context myContext = new InitialContext(props);
Connection myConnection = myDataSource.getConnection();
}
catch (Exception e)
{
e.printStackTrace();
System.out.println();
}
}
}


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I start a Server instance from IBM WSAD and it runs on 8081.

Please suggest what to do .