RowMapperを使用してOracle DBから単一行を取得しようとしていますが例外が発生する

Question

SpringでRowMapperを使用してOracle DBから単一行を取得しようとしていますが、 .NoClassDefFoundError：ORG/springframework/DAO /はDuplicateKeyExceptionは、いずれも以下説明することができます私のコード

1.row Mapper Implementation: 

public class EmployeeRowMapper implements RowMapper{ 

    public Object mapRow(ResultSet rs,int rowNmu) throws SQLException 
    { 
     Employee e = new Employee(); 
     e.seteId(rs.getInt("ID")); 
     e.seteName(rs.getString("name")); 
     e.seteSal(rs.getFloat("sal")); 
     return e; 
    } 
} 

2.Trying to retrieving Row 
public Employee getEmpById(int id) 
{ 
String sql = "select * from emp where ENO = ?"; 
//jt=new JdbcTemplate(ds); 
@SuppressWarnings("unchecked") 
Employee e = (Employee)jt.queryForObject(sql,new Object[] {id},new EmployeeRowMapper()); 
return e; 
} 

Answer 1

Employee.java 
     package com.springJdbc.insert; 

    public class Employee { 
    private int eId; 
    private String eName; 
    private Float eSal; 

public Employee() 
{ 

    } 
    public Employee(int id, String name, Float sal) { 
     this.eId = id; 
     this.eName = name; 
     this.eSal = sal; 
    } 

     getters & Setters 
} 

あるJdbcEmpDAOImpl

  package com.springJdbc.insert; 
    import java.sql.ResultSet; 
    import java.sql.SQLException; 

    import javax.sql.DataSource; 

    import org.springframework.dao.EmptyResultDataAccessException; 
    import org.springframework.jdbc.core.BeanPropertyRowMapper; 
    import org.springframework.jdbc.core.JdbcTemplate; 
    import org.springframework.jdbc.core.Row Mapper; 
    import org.springframework.web.servlet.tags.EscapeBodyTag; 

    public class JdbcEmpDAOImpl { 
    //private DataSource ds; 
    private JdbcTemplate jt; 

    public void setJt(JdbcTemplate jt) { 
    this.jt = jt; 
    } 

    public Employee getEmpById(int id) 
{ 
String sql = "select * from emp where ENO = ?"; 
//jt=new JdbcTemplate(ds); 
@SuppressWarnings("unchecked") 
Employee e = (Employee)jt.queryForObject(sql,new Object[] {id},new   EmployeeRowMapper()); 
return e; 
} 
} 

EmployeeRpwマッパー

package com.springJdbc.insert; 

import java.sql.ResultSet; 
import java.sql.SQLException; 

import org.springframework.jdbc.core.RowMapper; 

public class EmployeeRowMapper implements RowMapper{ 

    public Object mapRow(ResultSet rs,int rowNmu) throws SQLException 
    { 
     Employee e = new Employee(); 
     e.seteId(rs.getInt("ID")); 
     e.seteName(rs.getString("name")); 
     e.seteSal(rs.getFloat("sal")); 
     return e; 
    } 
} 

applicationContext.xmlを

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:task="http://www.springframework.org/schema/task" xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd"> 
<bean id = "empDAO" class = "com.springJdbc.insert.JdbcEmpDAOImpl"> 
<property name="jt" ref= "myJdbcTemplate"></property> 
</bean> 
<bean id="myJdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> 
    <constructor-arg ref="ds"/> 
    </bean> 
<bean id="ds" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> 
     <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/> 
     <property name="url" value="jdbc:oracle:thin:@localhost:1521:xe"/> 
     <property name="username" value="system"/> 
     <property name="password" value="manager"/> 
    </bean> 
</beans> 

JdbcDemo.java

package com.springJdbc.insert; 
import org.springframework.context.ApplicationContext; 
import org.springframework.context.support.ClassPathXmlApplicationContext; 
import org.springframework.dao.DataAccessException; 



    public class jdbcDemo{ 
     public static void main(String[] args) throws Exception{ 
      ApplicationContext ctx=new ClassPathXmlApplicationContext("appCntxt.xml"); 
       JdbcEmpDAOImpl jdbcEmpl = (JdbcEmpDAOImpl) ctx.getBean("empDAO"); 
       // Employee employee3 = new Employee(101,"Balu",300000.06f); 
       //jdbcEmpl.insert(employee3); 
      int a=102; 
      try{ 
      Employee e = jdbcEmpl.getEmpById(103); 
      System.out.println("from db"+e.geteId()); 
      } 
      catch(DataAccessException e) 
      { 
       e.printStackTrace(); 
      } 


//    Employee employee4 = jdbcEmployeeDAO.findById(456); 

       // System.out.println(employee4); 

       // context.close(); 
     } 
    }