how to connect database using spring.xml in spring?

Question

I'm new to the Spring framework and I was trying to do some basic database operations.I'm using oracle 10g for the database.I imported the jar files correctly. Previously, I used the same database configuration directly in JdbcDaoImplement.java and its working fine but when I put the database configuration in spring.xml file its throwing errors.Please tell me what is wrong?

My spring.xml includes:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xmlns:context="http://www.springframework.org/schema/context"
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
                http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
                http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd">

        <context:annotation-config></context:annotation-config>

        <context:component-scan base-package="org.spring"></context:component-scan>

        <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource" autowire="byName">
        <property name="driverClassName" value="oracle.jdbc.OracleDriver"></property>
        <property name="url" value="jdbc:oracle:thin:@localhost:1521:ORCL"></property>
        <property name="username" value="system"></property>
        <property name="password" value="abcd"></property>
    </bean>
</beans>

Rect.java:

package org.spring.model;

public class Rect {

    private int id;
    private String name;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    public Rect(int rectId, String rectName)
    {
        setId(rectId);
        setName(rectName);
    }


}

Next, JdbcDaoImplement .java

package org.spring.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.sql.DataSource;

import org.spring.model.Rect;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class JdbcDaoImplement {
    @Autowired
    private DataSource dataSource;



    public DataSource getDataSource() {
        return dataSource;
    }



    public void setDataSource(DataSource dataSource) {
        this.dataSource = dataSource;
    }



    public Rect getRect(int rectId)
    {
        Connection conn=null;

        try
        {
            //String DriverName="oracle.jdbc.OracleDriver";
            //Class.forName(DriverName);
            //String jdbcUrl = "jdbc:oracle:thin:@localhost:1521:ORCL";
            //conn = DriverManager.getConnection(jdbcUrl, "system", "abcd");
            conn = dataSource.getConnection();
            PreparedStatement ps=conn.prepareStatement("SELECT * FROM RECTANGLE WHERE id=?");
            ps.setInt(1, rectId);

            Rect rect=null;
            ResultSet rs=ps.executeQuery();
            if(rs.next()==true)
            {
                rect=new Rect(rectId,rs.getString("name"));


            }
            rs.close();
            ps.close();
            return rect;
        }
        catch(Exception e)
        {
            throw new RuntimeException();
        }
        finally
        {
            try {
                conn.close();
            } catch (SQLException e) {
                //e.printStackTrace();

            }
        }
    }

}

and JdbcDemo .java

package org.spring;

import org.spring.dao.JdbcDaoImplement;
import org.spring.model.Rect;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class JdbcDemo {

    public static void main(String[] args) {
        ApplicationContext ctx=new ClassPathXmlApplicationContext("spring.xml");
        JdbcDaoImplement dao=ctx.getBean("dataSource",JdbcDaoImplement.class);
        Rect rect=dao.getRect(1);
        System.out.println(rect.getName());
    }

}

and the error log is :

INFO: Loaded JDBC driver: oracle.jdbc.OracleDriver
Exception in thread "main" org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'dataSource' must be of type [org.spring.dao.JdbcDaoImplement], but was actually of type [org.springframework.jdbc.datasource.DriverManagerDataSource]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:376)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:979)
    at org.spring.JdbcDemo.main(JdbcDemo.java:12)

Answer 1

Question 1 answer

Change:

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource.class" autowire="byName">

To:

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource" autowire="byName">

Ie remove the .class ! :)

Question 2 answer

In your main method, you're referring to DataSource bean by id, but the JdbcDaoImplement bean by type. Ie you're referring to two different Spring beans. Simple update your main method as follows:

public static void main(String[] args) {
    ApplicationContext ctx=new ClassPathXmlApplicationContext("spring.xml");
    JdbcDaoImplement dao=ctx.getBean(JdbcDaoImplement.class);
    Rect rect=dao.getRect(1);
    System.out.println(rect.getName());
}

Answer 2

Judging by exception type, you are missing spring-jdbc module

Answer 3

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans.xsd">


    <bean id="dataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="org.h2.Driver"></property>
        <property name="url" value=" jdbc:h2:tcp://localhost/~/test2"></property>
        <property name="username" value="sa"></property>
        <property name="password" value="sa"></property>
    </bean>

    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="hibernateProperties">
            <props>
                <!-- hibernate mapping to data definition lang -->
                <prop key="hibernate.dialect">org.hibernate.dialect.H2Dialect</prop>
                <prop key="hibernate.hbm2ddl.auto">create</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>
            </props>
        </property>
        <property name="packagesToScan"><!-- Entities -->
            <list>
                <value>com.nt</value>
            </list>
        </property>
    </bean>

    <bean id="transactionManager"
        class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>

</beans>