org.hibernate.MappingException:Could not read mappings from resource :CustomerAccount
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caused by : org.hibernate.MappingException :duplicate calss mapping :CustomerAccount
.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
  <class name="AccountType" table="account_type" optimistic-lock="none">
    <id name="accountTypeId" type="short" unsaved-value="null" column="account_type_id">
      <generator class="native"/>
    </id>
    <property name="name" type="string" column="name" length="40" not-null="true"/>
    <property name="description" type="string">
      <column name="description" not-null="true"/>
    </property>
    <one-to-one name="customerAccount" entity-name="CustomerAccount" cascade="save-update" foreign-key="customer_account_ibfk_2" property-ref="accountTypeId"/>
  </class>
</hibernate-mapping>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
  <class name="AccountStatus" table="account_status" optimistic-lock="none">
    <id name="accountStatusId" type="short" unsaved-value="null" column="account_status_id">
      <generator class="native"/>
    </id>
    <property name="name" type="string" column="name" length="40" not-null="true"/>
    <property name="description" type="string">
      <column name="description"/>
    </property>
    <one-to-one name="customerAccount" entity-name="CustomerAccount" cascade="save-update" foreign-key="customer_account_ibfk_1" property-ref="accountStatusId"/>
  </class>
</hibernate-mapping>

public class Main extends HttpServlet{
SessionFactory factory =null;
   
public void init() {
      try {
         
         Configuration config = new Configuration();
      /*   config.addClass(AccountStatus.class);
         config.addClass(AccountType.class);*/
         config.addClass(CustomerAccount.class);
         config.configure();
          factory= config.buildSessionFactory();
      
         System.out.println("Hibernate Successfully initialized");

          }catch(Exception e)
         {
            System.out.println("---------------------------------First try *--------------------------");   
            e.printStackTrace(System.out);
            System.out.println("---------------------------------First try *--------------------------");
         }
            }

   public void doPost(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
         {

            res.setContentType("text/htm");
            PrintWriter out=res.getWriter();
            try
               {
         Session session = factory.openSession();
         AccountStatus acStatus=null;
         AccountType acType=null;
                  
         
            Transaction tx =  session.beginTransaction();
         
         
            Query query=session.createQuery("from AccountType as acType  where

acType.accountTypeId="+1);
             for(Iterator itr = query.iterate(); itr.hasNext(); ) {
                     acType = (AccountType)itr.next(); 
                 }
              query=session.createQuery("from AccountStatus as acStatus  where

acStatus.accountStatusId="+1);
             for(Iterator itr = query.iterate(); itr.hasNext(); ) {
                     acStatus = (AccountStatus)itr.next(); 
                 }
             CustomerAccount cusAccount = new CustomerAccount();
             cusAccount.setAccountStatusId(acStatus);
             cusAccount.setAccountTypeId(acType);
             cusAccount.setAddress1("Raj bavan");
             cusAccount.setAddress2("ddddd");
             cusAccount.setCity("New york");
             cusAccount.setCompanyName("Finocus inc.,");
             cusAccount.setCustomerId(new Long("65"));
             cusAccount.setFax(new Long("737373"));
             cusAccount.setState("Dubai");
             cusAccount.setSuite("848");
             cusAccount.setTelephone(new Long("3434"));
             cusAccount.setWww("wwww.google.com");
             cusAccount.setZip(new Integer("84848"));
            
         session.save(cusAccount);
         tx.commit();
         session.flush();
         session.close();
         
      System.out.println("Saved Successfully");
      }
      catch(Exception e)
      {
            System.out.println("---------------------------------Second try *--------------------------");
         e.printStackTrace(System.out);
            System.out.println("---------------------------------Second try *--------------------------");
            

      }

   }

}