How to get Array type members' value from a class

Hi friends.
i'm having problem to get values of a class member variable which itself is a class and resides inside another class as an array.
Parent class is CA. its one of the member is CB[] class.
my problem was to get values of CB class.
following is the dedtails of my code.
i was using weblogic workshop 8.1, using JSP, NETUI-tag, JPF.
please help me out -- how to get CB's value from CA class in action method.
thanks in advance.

[ if you need any more infos, please ask me for that.]

/******* class CA **********/
public class CA FormData
{ 
    private String      AID;
    private String      AName;
    public  CB[]  cb;

    public void setAID       (String value)      { this.AID= value;}
    public void setAName     (String value)      { this.AName= value;}
    public void setCB     (CB[] value)  { this.cb= value;}

    public String getAID         (){ return this.AID;}
    public String getAName       (){ return this.AName;}
    public CB[] getCB   (){ return this.cb;}
}
/********* Class CB ***********/
public class CB implements Serializable
{ 
    private String  BID;
    private String  BText;
    private boolean select;

    public void setSelect(boolean value){this.select = value;}
    public void setBID       (String value)      { this.BID= value;}
    public void setBText     (String value)      { this.BText= value;}

    public String getBID         (){ return this.BID;}
    public String getBText       (){ return this.BText;}
    public boolean isSelect(){return this.select;}
}

/****** pageA.jsp *********/
                <netui:form action="CreateTest">
                    <table>
                        <tr>
                            <td colspan="2">Create Tests</td>
                        </tr>
                        <tr>
                            <td>Name</td>
                            <td><netui:textBox dataSource="{actionForm.AName}" /></td>
                        </tr>
                        <tr>
                            <td colspan="2"> Select CBs</td>
                        </tr>
                        <tr>
                            <td colspan="2">
                                <netui-data:repeater dataSource="{actionForm.cb}">
                                    <netui-data:repeaterItem>
                                            <tr>
                                                <td><netui:hidden dataSource="{container.item.BID}" />
                                                    <netui:checkBox tagId="chb" dataSource="{container.item.select}" /></td>
                                                <td><netui:label value="{container.item.BText}" /></td>
                                            </tr>
                                    </netui-data:repeaterItem>
                                </netui-data:repeater>
                            </td>
                        </tr>
                        <tr>
                            <td><netui:button value="Create">Save</netui:button></td>
                        </tr>
                    </table>
                </netui:form>
/******************************************************/

/**************** pageController.jpf *********************/
public class PageController extends PageFlowController
{
    /**
     * @common:control
     */
    private DBControl dbControl;

    /**
     * @jpf:action
     * @jpf:forward name="create" path="PageA.jsp"
     */
    protected Forward goPageA()
    {
        CAeForm = new CA();
        CB[] cb= dbControl.getCBs();
        eForm.setCB(cb);
        return new Forward("create",eForm);
    }


    /**
     * @jpf:action
     * @jpf:forward name="success" path="Default.jsp"
     */
    protected Forward CreateTest(CA eForm)
    {
        eForm.cb= dbControl.getCBs();
        String AID = null;
        try
        {
            dbControl.insertCA(eForm.getAName());
            AID = dbControl.getExamID(eForm.getAName());
            String CBID = null;
            for(int i=0; i<eForm.cb.length; i++) 
/**** GOT NULLPOINTEREXCEPTION AS "eForm.cb" IS GIVING null RETURN !!   ****/
            {
                if(eForm.cb[i].isSelect())
                {
                    CBID = eForm.cb[i].getBID();
                    try
                    {
                        dbControl.insertCBInA(AID,CBID);
                    }
                    catch(SQLException e){String msg = e.getMessage();}
                }
            }
        }
        catch(SQLException e){String msg = e.getMessage();}
        /******** INSERTION COMPLETE *****************/
        return new Forward("success",eForm);
    }