Memory leak problem need help!!

Question

     public void query(String firstName, String lastName, String citizenId) throws Exception{
               this.eimFirstName = firstName;
               this.eimLastName  = lastName;
               this.eimCitizenId = citizenId;
               String searchstr = "(([First Name] =\""+firstName+"\" AND [Last Name]=\""+lastName+"\" )OR [Social Security Number]=\""+citizenId+"\") AND [Status]=\"Prospect\""; // = (([First Name] = 'firstName' AND [Last Name] = 'lastName') OR [Citizen Id] = 'citizenId') AND ([Status]='Prospect')
               contactWrapper=null; // set to null
               contactWrapper=new BusCompWrapper();//instantiate
               contactWrapper.query(siebelWrapper, "Contact", "Contact", searchstr, queryFieldList);//leaks here     
}if i comment out the last line , the memory leak won't happen.
correct me if i'm wrong, i think that i need to free the reference of contactWrapper in order to avoid memory leak? but how do i do that? i set it to null but why still i have the leak
thanks guys

Answer 1

this may help
public class BusCompWrapper
     private List fields;
     private int buscompstatus;
     private int position=0;
     private com.siebel.data.SiebelBusComp oBusComp;
     private com.siebel.data.SiebelBusObject oBusObj;
          Gets next record from Business Component
          @return Iterator of values in String
          @return empty Iterator if no more record to read
     public Iterator getNextRecord() throws BoaException
          try{
               ArrayList al = new ArrayList();
               if (position==0){
                    if (!oBusComp.firstRecord()){
                         return null;
               }else{
                    if (!oBusComp.nextRecord()){//no more record left, return empty enumeration
                         return null;
               position++;
               Iterator it = fields.iterator();
               while (it.hasNext()){
                    String next = (String)it.next();
                    oBusComp.activateField(next);
                    String s = oBusComp.getFieldValue(next);
                    al.add(s);
               return al.iterator();
          }catch (SiebelException e){
               throw new BoaException(e,new String[]{ExceptionConstants.ERROR_GETTING_NEXT_RECORD_IN_BUSINESS_COMP,"\n"+e.getErrorMessage()},2);
     public void query(SiebelWrapper siebelWrapper, String busobjname, String buscompname, String querystr,List fields) throws BoaException
          try{
               oBusObj = siebelWrapper.getSiebelDataBean().getBusObject(busobjname);
               oBusComp = oBusObj.getBusComp(buscompname);
               Iterator it=fields.iterator();
               while(it.hasNext()){
                    oBusComp.activateField((String)it.next());
               oBusComp.setViewMode(3);
               oBusComp.clearToQuery();
               oBusComp.setSearchExpr(querystr);
               oBusComp.executeQuery(true);
               this.fields = fields;
               position=0;
          }catch(SiebelException e){
               e.printStackTrace();
               throw new BoaException(e,new String[]{ExceptionConstants.ERROR_QUERYING_BUSINESS_COMP,"\n"+e.getErrorMessage()},2);
public class  ContactSiebelWrapper
     private String
          currentRowId,
          currentFirstName,
          currentLastName,
          currentBirthDate,
          currentCitizenId;
     private SiebelWrapper siebelWrapper;
     private ArrayList currentUpdate;
     private String eimFirstName;
     private String eimLastName;
     private String eimCitizenId;
     private ArrayList phoneList;
     private ArrayList addressList;
     private BusCompWrapper contactWrapper;
private static List queryFieldList=Arrays.asList(new String[]{"Id","First Name","Last Name","Social Security Number","Birth Date","Status","Integration Id","Party UId"});
private static List phoneFieldList=Arrays.asList(new String[]{"ACU Telephone Type","ACU Telephone Number","ACU Telephone Extension"});
private static List addressFieldList=Arrays.asList(new String[]{"Street Address","Street Address 2","ACU Street Address 3","City","Postal Code"});
     /**FileLogger for event logging*/
     private FileLogger logger;
     /**Date format for parsing date to Date object*/
     private String siebelDateFormat;
          Constructs ContactSiebelWrapper from specified SiebelWrapper and FileLogger objects
     public ContactSiebelWrapper(SiebelWrapper param,FileLogger logger,String siebelDateFormat)
          this.logger=logger;
          siebelWrapper = param;
          currentUpdate = new ArrayList();
          phoneList = new ArrayList();
          this.siebelDateFormat=siebelDateFormat;
          Advances to the next record in Business component.
          @return true if there is next record, false otherwise
     public boolean advanceRecord() {
          try {
                    Iterator retval = contactWrapper.getNextRecord();
                    if (retval==null){
/*contactWrapper=null;
phoneList=null;
addressList=null;*/
                         return false;
                    currentRowId     = (String) retval.next();
                    currentFirstName = CommonUtils.iso8859_1ToMS874((String) retval.next());
                    currentLastName  = CommonUtils.iso8859_1ToMS874((String) retval.next());
                    currentCitizenId = (String) retval.next();
                    currentBirthDate = (String) retval.next();
                    getPhoneList();
                    getAddressList();
                    return true;
          } catch (Throwable e) {
               logger.logLine("ERROR while advancing to next record");
               e.printStackTrace();
               return false;
     public void query(String firstName, String lastName, String citizenId) throws Exception{
               this.eimFirstName = firstName;
               this.eimLastName  = lastName;
               this.eimCitizenId = citizenId;
               String searchstr = "(([First Name] =\""+firstName+"\" AND [Last Name]=\""+lastName+"\" )OR [Social Security Number]=\""+citizenId+"\") AND [Status]=\"Prospect\""; // = (([First Name] = 'firstName' AND [Last Name] = 'lastName') OR [Citizen Id] = 'citizenId') AND ([Status]='Prospect')
               contactWrapper=new BusCompWrapper();
               contactWrapper.query(siebelWrapper, "Contact", "Contact", searchstr, queryFieldList);
     }