InitialContext initContext	=  new  InitialContext();
Context envContext = (Context)initContext.lookup("java:comp/env");
WSDataSource    ds = (WSDataSource) envContext.lookup("jdbc/DB2Connect2");
con = ds.getConnection();
logger.info("Connect OK");

DataSource ds = (DataSource) ctx.lookup("java:comp/env/jdbc/DB2Connect2");
Connection conn = ds.getConnection();

<resources.j2c:J2CResourceAdapter xmi:id="builtin_rra" name="WebSphere Relational Resource Adapter" description="Built-in Relational Resource Adapter for WebSphere Persistence" archivePath="${WAS_LIBS_DIR}/rsadapter.rar">
    <classpath>${WAS_LIBS_DIR}/rsadapter.rar</classpath>
    <propertySet xmi:id="J2EEResourcePropertySet_1298027770801"/>
    <deploymentDescriptor xmi:id="Connector_1298027770801" displayName="WS_RdbResourceAdapter" vendorName="IBM" specVersion="1.5" eisType="RRA" version="6.0">
      <icons xmi:id="IconType_1298027770801" smallIcon="rdb_small_icon.jpg" largeIcon="rdb_large_icon.jpg"/>
      <displayNames xmi:id="DisplayName_1298027770801" value="WS_RdbResourceAdapter"/>
      <displayNames xmi:id="DisplayName_1298027770802" value="WS_RdbResourceAdapter"/>
      <descriptions xmi:id="Description_1298027770801" value="IBM Relational ResourceAdapter"/>
      <license xmi:id="License_1298027770801" required="false">
        <descriptions xmi:id="Description_1298027770802" value="IBM Relational ResourceAdapter"/>
      </license>
      <resourceAdapter xmi:id="ResourceAdapter_1298027770801" transactionSupport="NoTransaction" reauthenticationSupport="false" resourceAdapterClass="com.ibm.ws.rsadapter.spi.WSResourceAdapterImpl">
        <outboundResourceAdapter xmi:id="OutboundResourceAdapter_1298027770801" reauthenticationSupport="false" transactionSupport="XATransaction">
          <connectionDefinitions xmi:id="ConnectionDefinition_1298027770801" managedConnectionFactoryClass="com.ibm.ws.rsadapter.spi.WSManagedConnectionFactoryImpl" connectionFactoryInterface="javax.resource.cci.ConnectionFactory" connectionFactoryImplClass="com.ibm.ws.rsadapter.cci.WSRdbConnectionFactoryImpl" connectionInterface="javax.resource.cci.Connection" connectionImplClass="com.ibm.ws.rsadapter.cci.WSRdbConnectionImpl">
            <configProperties xmi:id="ConfigProperty_1298027770801" name="ConnectionFactoryType" type="java.lang.Integer" value="2">
              <descriptions xmi:id="Description_1298027770803" value="A constant indicating the type of connection factory: WSJdbcDataSource (1) or WSRdbConnectionFactory (2)"/>
            </configProperties>
          </connectionDefinitions>
          <authenticationMechanisms xmi:id="AuthenticationMechanism_1298027770801" authenticationMechanismType="BasicPassword" credentialInterface="javax.resource.spi.security.PasswordCredential">
            <descriptions xmi:id="Description_1298027770804" value="BasicPassword authentication"/>
          </authenticationMechanisms>
          <authenticationMechanisms xmi:id="AuthenticationMechanism_1298027770802" authenticationMechanismType="Kerbv5" credentialInterface="javax.resource.spi.security.GenericCredential">
            <descriptions xmi:id="Description_1298027770805" value="Kerbv5 Authentication"/>
          </authenticationMechanisms>
        </outboundResourceAdapter>
      </resourceAdapter>
    </deploymentDescriptor>
    <connectionDefTemplateProps xmi:id="ConnectionDefTemplateProps_1298027770801" ConnectionDefinition="ConnectionDefinition_1298027770801"/>
  </resources.j2c:J2CResourceAdapter>