Error using the MDM Java Connector

Question

Hi All,
I am developing a Web Dynpro type DC where I need to use MDM, I tried to reach MDM repository using the following code:
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.resource.ResourceException;
import a2i.common.A2iResultSet;
import a2i.common.CatalogData;
import a2i.common.ResultSetDefinition;
import a2i.search.Search;
import com.sapportals.connector.ConnectorException;
import com.sapportals.connector.connection.ConnectionFailedException;
import com.sapportals.connector.connection.IConnection;
import com.sapportals.connector.connection.IConnectionFactory;
import com.sapportals.connector.connection.IConnectionSpec;
import com.sapportals.connector.connection.INative;
import com.sapportals.connector.connection.InterfaceNotSupportedException;
import com.sapportals.connector.metadata.CapabilityNotSupportedException;
public class Mdmjconn{
     public /*IConnection*/ String conn()/*throws Exception*/{
          String s = null;
          String str = "start ";
          Context ctx = null;
          try{
               ctx = new InitialContext();
          }catch(NamingException nex){
               str = str + "[" + nex.getLocalizedMessage() + "]" + " NamingException - InitialContext| ";
          IConnectionFactory connectionFactory = null;
          try{
               connectionFactory = (IConnectionFactory)ctx.lookup("deployedAdapters/MDM Factory/shareable/MDM Factory");
          catch(NamingException nex){
               str = str + "[" + nex.getMessage() + "]" + " NamingException - lookup| ";
          catch(ClassCastException ccex){
               str = str + "[" + ccex.getMessage() + "]" + " ClassCastException - lookup| ";
          IConnectionSpec spec = null;
          CatalogData catalog = null;
          IConnection connection = null;
          try{
               spec = connectionFactory.getConnectionSpec();
               spec.setPropertyValue("UserName", "Admin");
               spec.setPropertyValue("Password", "Admin");
               spec.setPropertyValue("Server", "localhost");
               spec.setPropertyValue("Port", "2005");
               spec.setPropertyValue("RepositoryLanguage", "English [US]");
          }catch(ConnectorException cex){
               str = str + "[" + cex.getMessage() + "]" + " ConnectorException - getConnectionSpec| ";
          }catch(NullPointerException npex){
               str = str + "[" + npex.getMessage() + "]" + " NullPointerException - getConnectionSpec| ";
          INative nativeInterface = null;
          try{
               connection = connectionFactory.getConnectionEx(spec);
          }catch(ConnectionFailedException cfex){
               str = str + "[" + cfex.getMessage() + "]" + " ConnectionFailedException - getConnectionEx| ";
          }catch(ConnectorException cex){
               str = str + "[" + cex.getMessage() + "]" + " ConnectorException - getConnectionEx| ";
          }catch(NullPointerException npex){
               str = str + "[" + npex.getMessage() + "]" + " NullPointerException - getConnectionEx| ";
          try{
               nativeInterface = connection.retrieveNative();
          }catch(CapabilityNotSupportedException cnsex){
               str = str + "[" + cnsex.getMessage() + "]" + " CapabilityNotSupportedException - retrieveNative| ";
          }catch(NullPointerException npex){
               str = str + "[" + npex.getMessage() + "]" + " NullPointerException - retrieveNative| ";     
          try{
               catalog = (CatalogData)nativeInterface.getNative(CatalogData.class.getName());
          }catch(InterfaceNotSupportedException insex){
               str = str + "[" + insex.getMessage() + "]" + " InterFaceNotSupportedException - getNative| ";
          }catch(ConnectorException cex){
               str = str + "[" + cex.getMessage() + "]" + " ConnectorException - getNative| ";
          }catch(NullPointerException npex){
               str = str + "[" + npex.getLocalizedMessage() + "]" + " NullPointerException - getNative| ";
//TEST SEARCH BEGIN
            A2iResultSet rs;
            ResultSetDefinition resultdefinition = new ResultSetDefinition("MDM_BUSINESS_PARTNERS");
           resultdefinition.AddField("MDM_PARTNER_ID");
           resultdefinition.AddField("MDM_FIRST_NAME");
           resultdefinition.AddField("MDM_LAST_NAME");
           resultdefinition.AddField("M_CITY");
           resultdefinition.AddField("M_POSTAL_CODE");
           resultdefinition.AddField("M_STREET");
           resultdefinition.AddField("M_HOUSE_NUMBER");
           resultdefinition.AddField("M_COUNTRY");     
           resultdefinition.AddField("M_DUNS");
           resultdefinition.AddField("MDM_TAX_NUMBER_1");
          Search search = new Search(resultdefinition.GetTable());
          try {     
                 rs = catalog.GetResultSet(search, resultdefinition, "MDM_PARTNER_ID", true, 0);
                 int i=0;//1316;
                 int idd = 0;
               i = 1327;
               idd = rs.GetValueAt(i, "MDM_PARTNER_ID").GetIntValue();
               String namef = rs.GetValueAt(i, "MDM_FIRST_NAME").TranslateToString();
               String namel = rs.GetValueAt(i, "MDM_LAST_NAME").TranslateToString();
               String city = rs.GetValueAt(i, "M_CITY").TranslateToString();
               String pc = rs.GetValueAt(i, "M_POSTAL_CODE").TranslateToString();
               String street = rs.GetValueAt(i, "M_STREET").TranslateToString();
               String hn = rs.GetValueAt(i, "M_HOUSE_NUMBER").TranslateToString();
               String country = rs.GetValueAt(i, "M_COUNTRY").TranslateToString();
               String duns = rs.GetValueAt(i, "M_DUNS").TranslateToString();
               String tax = rs.GetValueAt(i, "MDM_TAX_NUMBER_1").TranslateToString();
               str = namef + ", " + namel + ", " + city + ", " + pc + ", " + street + ", " + hn + ", "+ country + ", "+ duns + ", " + tax + "! ";
            }catch (a2i.core.StringException e){
                 e.A2iPrintError();     
                 str = str + "Error at GetValueAt| ";
            }catch(NullPointerException npex){
                 str = str + "[" + npex.getLocalizedMessage() + "]" + " NullPointerException - GetResultSet, GetValueAt| ";
//TEST SEARCH END               
          try{
               connection.close();
          }catch(ResourceException rex){
               str = str + "[" + rex.getMessage() + "]" + " ResourceException - close| ";
          }catch(NullPointerException npex){
               str = str + "[" + npex.getMessage() + "]" + " NullPointerException - close| ";
          if(str == null){
               return "zero";
          }else
          return str;
I got the following result:
<i>start [null] ClassCastException - lookup| [null] NullPointerException - getConnectionSpec| [null] NullPointerException - getConnectionEx| [null] NullPointerException - retrieveNative| [null] NullPointerException - getNative| [null] NullPointerException - GetResultSet, GetValueAt| [null] NullPointerException - close| </i>
So the code throws ClassCastException at the <b>lookup</b> method call and causes the other NullPointerExceptions.
I checked the JNDI Registry in VA, the "deployedAdapters/MDM Factory/shareable/MDM Factory" path is right.
What can be the reason for this problem?
Thanks & regards,
Peter

Answer 1

My problem is solved!
The only needed Web Dynpro Library References were the following:
com.sap.mdm.tech.mdm4j
tcconnconnectorframework