How to get data from other table in controller

I'm not very good in Java and Spring, and I need help on this. Thanks in advance.

I need to get data from other table(Customer) to be used in my printing routine.

Controller:

@RequestMapping( value = { FORM_URL }, method = RequestMethod.POST )
public ModelAndView processData( @ModelAttribute( "bean" ) PassBookIssuance formBean, BindingResult result,
                                 HttpServletRequest request )
    throws JournalException
{

     ModelAndView mnv = null;

     if ( request.getSession() == null )
     {
         mnv = new ModelAndView( "timeout.jsp" );
         // display session timeout page
         // add session timeout message error
         mnv.addObject( DepositsControllerUtil.VAR_ERROR_MESSAGE,
                        ErrorCode.BDS_USER_SESSION_TIMEOUT.getDescription() );
         return mnv;
     }

     // check if validation failed
     if ( result.hasErrors() )
     {
         mnv = new ModelAndView( FORMVIEW );
         // check if teller override boolean flag is to be enabled
         DepositsControllerUtil.checkTellerOverrideError( mnv, result );
         // add static values
         loadDefault( mnv.getModelMap() );
         // return to presentation layer with model that contains errors
         return mnv;
     }

     /* ======== Validation if successful, continue processing then do a redirect======= */

     // add required fields
     fieldGenerator.populateConstantHeader( formBean, request );

     // save transaction
     JournalNonFinancial journalNonFT  = journalNonFinancialManagerImpl.save(formBean);

     // send to host
     Map<String, Object> returnMap = hostConnectionDelegate.invoke( formBean, wsNonFTBean );

     // get response from the returned map
     HostRequest response = HostConnectionDelegateUtil.getHostResponse( returnMap );

     // update transaction table based on host response
     if ( !HostConnectionDelegateUtil.isApproved( response ) )
     {
         journalNonFT.setErrorCode( response.getErrorCode() );
         journalNonFT.setStatus( response.getStatus() );
     }
     else
     {
         journalNonFT.setStatus( response.getStatus() );

     }
     // save journal
     journalNonFinancialManagerImpl.saveJournalNonFinancial( journalNonFT );

     if ( request.getSession() != null )
     {
         // add response to session for the presentation layer to display transaction results.
         request.getSession().setAttribute( "bean", response );
     }

     /**
      *     Media validation - CDEP
      */ 
     String acctNo = journalNonFT.getAccountNumber();
     String name = "";
     String unit = unitUtil.getUnit().getAddress();

     String toPrint = acctNo + "\n" + name + "\n" + unit;

     try {
        SilentPrintMediaValidation print = new SilentPrintMediaValidation();
         print.printPdf( toPrint, "Passbook Issuance" );
     } catch ( Exception e ){
        e.printStackTrace();
        System.out.println( "Printing error" );
     }

     RedirectView redirectView = new RedirectView( "/general" + FORM_URL );
     return new ModelAndView( redirectView );

}

Model:

package com.eteligent.core.form.nonfinancial;

import com.eteligent.core.form.HostNonFinancialRequest;
import com.eteligent.core.form.enums.PsBokIssueReasonCode;

public class PassBookIssuance extends HostNonFinancialRequest {

private String newSerialNo;

private String oldSerialNo;

private PsBokIssueReasonCode issueReason;


public String getNewSerialNo() {
    return newSerialNo;
}

public void setNewSerialNo(String newSerialNo) {
    this.newSerialNo = newSerialNo;
}

public String getOldSerialNo() {
    return oldSerialNo;
}

public void setOldSerialNo(String oldSerialNo) {
    this.oldSerialNo = oldSerialNo;
}

public PsBokIssueReasonCode getIssueReason() {
    return issueReason;
}

public void setIssueReason(PsBokIssueReasonCode issueReason) {
    this.issueReason = issueReason;
}

}

JSP:

<%@ taglib uri="http://ift.tt/QfKAz6" prefix="c"%>
<%@ taglib uri="http://ift.tt/1bRkrVx" prefix="fmt"%>
<%@ taglib uri="http://ift.tt/IED0jK" prefix="form"%>
<%@ taglib uri="http://ift.tt/1bjwgjt" prefix="tiles"%>

<%--Note to Dev: change only the form action value --%>

<div id="cash-deposit-form">

    <c:if test="${override == true}">
        <input type="hidden" name="override" value="y" />
    </c:if> 

    <br />
    <form:form name="formPage" action="/general/passbook-issuance-request" method="POST" modelAttribute="bean">

        <%-- Hidden input for override verification --%>
        <input type="hidden" name="override" value="${override}">


        <!-- insert common attributes of financial transactions here -->
        <tiles:insertTemplate template="/WEB-INF/layouts/common/tellering_common.jsp" />


        <%-- Hidden input for transaction date holder for date extra handling --%>
        <input type="hidden" id="transactionDateHolder" name="transactionDateHolder" value="${bean.transactionDate}">


        <%-- Hidden transaction group name for collapsing the proper left menu navigation --%>
        <input type="hidden" name="tranGroup" value="otherTrans" id="tranGroup">


        <%-- Hidden page name to highlight the proper left menu navigation --%>
        <input type="hidden" name="pageName" value="pbookIssue" id="pageName">


        <div class="datagrid" style="display: inline-block;" >
            <table width="100%" class="form basic-info" cellspacing="0" cellpadding="0">

            <thead>
                <tr>
                    <th colspan="2">Passbook Issuance Request</th>
                </tr>
            </thead>

                <tr>
                    <td>Transaction Date :</td>
                    <td><form:input path="transactionDate" class="datepicker"
                        id="transactionDate" tabindex="1" />
                        <img alt="help" src="/images/question_blue.png"
                        class="datepickerHelp"> <form:errors path="transactionDate"
                        cssClass="error" />
                    </td>
                </tr>
                <tr>
                    <td>Account Number :</td>
                    <td><form:input path="accountNumber"
                        value="${sessionScope.bean.accountNumber}"
                        onkeypress="return isNumberKey(event)" tabindex="2" class="firstField"/> 
                        <form:errors path="accountNumber" cssClass="error" />
                    </td>
                </tr>
                <tr>
                    <td>Old Passbook Serial Number :</td>
                    <td><form:input path="oldSerialNo"
                            onkeypress="return isNumberKey(event)" tabindex="4" value="${sessionScope.bean.oldSerialNo}" /> <form:errors
                            path="oldSerialNo" cssClass="error" /></td>
                </tr>
                <tr>
                    <td>New Passbook Serial Number :</td>
                    <td><form:input path="newSerialNo"
                            onkeypress="return isNumberKey(event)" tabindex="4" value="${sessionScope.bean.newSerialNo}" /> <form:errors
                            path="newSerialNo" cssClass="error" /></td>
                </tr>
                <tr>
                    <td>Reason For Passbook Issuance Request :</td>
                    <td> <form:select path="issueReason" items='${issueReasons}' 
                            itemLabel="desc" itemValue="name" tabindex="4"  /><form:errors
                            path="issueReason" cssClass="error" />
                    </td>
                </tr>                           
                <tr>
                    <td>Remarks :</td>
                    <td><form:input path="remarks" tabindex="4" value="${sessionScope.bean.remarks}"/> <form:errors
                            path="remarks" cssClass="error" /></td>
                </tr>


                <tr>
                    <td colspan="2"><hr color="grey" size="2"/></td>
                </tr>   


                <tr>
                    <td>
                        <input name="btnSubmit" id="btnSubmit" type="submit" value="Submit" tabindex="8"> 
                        <!-- <input name="btnClear" id="btnClear" type="reset" value="Cancel" tabindex="9"> -->
                        <input name="btnBack" id="btnBack" type="button" value="Back" onclick="window.history.back()"
                                                        tabindex="10">                      
                    </td>
                </tr>
            </table>
        </div>


        <br />


        <%--End of Account Details--%>
        <%-- Start: Modal form --%>
        <div id="overrideModalDialog" title="Override Transaction Prompt">      
            <fieldset>
                <label for="officerId">Officer ID</label>
                <input type="text" name="officerId" id="officerId" class="text ui-widget-content ui-corner-all" />
                <label for="password">Password</label>
                <input type="password" name="password" id="password" value="" class="text ui-widget-content ui-corner-all" />
            </fieldset>
        </div>

        <div id="amountModalDialog" title="Amount Entry"> </div>



    </form:form>

    <br/>

    <tiles:insertTemplate template="/WEB-INF/layouts/common/tellering_status.jsp" />

    <c:if test="${not empty bean && empty bean.errorCode.description && not empty bean.status }">
        <c:remove var="bean" scope="session" />
    </c:if>
</div>

So the problem lies in the controller, I don't know how to get the name field in Customer table. Since I did not declare Customer in that routine, how do I get the details in customer table? Moreover, I need to query the name using the account number.

I know this is kind of confusing, but I'm also confused too that's why I need your expertise.

Questions: Should I use DAO or service? There is one here but I don't know how to call them in the controller.

I've been exposed to UI programming too much, I'm forgetting the basics in backend so please help me. Thanks.