Exception in thread "main" java.lang.ExceptionInInitializerError - spring

Question

Currently I am new to spring to trying to implement data-source with MySQL but I am facing a error but not able to understand what is main reason or error.
Exception in thread "main" java.lang.ExceptionInInitializerError
Apr 26, 2015 8:09:33 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext#4ee70b: startup date [Sun Apr 26 20:09:33 IST 2015]; root of context hierarchy
Exception in thread "main" java.lang.ExceptionInInitializerError
at org.springframework.context.support.AbstractRefreshableApplicationContext.createBeanFactory(AbstractRefreshableApplicationContext.java:194)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:127)
at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:465)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:395)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.rajdeo.jdbcspring.JdbcDemo.main(JdbcDemo.java:12)
Caused by: java.lang.NullPointerException
at org.springframework.beans.factory.support.DefaultListableBeanFactory.<clinit>(DefaultListableBeanFactory.java:104)
... 7 more
JdbcDemo.java
package com.x.jdbcspring;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.x.jdbcspring.JdbcDaoImpl;
public class JdbcDemo {
public static void main(String[] args) {
ApplicationContext ctx= new ClassPathXmlApplicationContext("spring.xml");
JdbcDaoImpl dao=ctx.getBean("JdbcDaoImpl",JdbcDaoImpl.class);
/*
//JdbcDaoImpl dao=new JdbcDaoImpl();
Student student=ctx.getStudent(1);
System.out.println("name::\t"+student.getName());
JdbcDaoImpl jdbc=new JdbcDaoImpl();
jdbc.getStudent(1);
System.out.println(jdbc.getStudent(1).getId());*/
}
}
JdbcDaoImpl.java
package com.x.jdbcspring;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
#Component
public class JdbcDaoImpl {
#Autowired
private DataSource datasource;
public DataSource getDatasource() {
return datasource;
}
public void setDatasource(DataSource datasource) {
this.datasource = datasource;
}
public Student getStudent(int id){
Connection con = null;
Student student=null;
try{
/* Class.forName("com.mysql.jdbc.Driver");
System.out.println("Connecting to database...");*/
con = datasource.getConnection();
PreparedStatement stmt=con.prepareStatement("select * from contact where contact_id =?");
stmt.setInt(1, id);
//Excute the query
ResultSet rs=stmt.executeQuery();
while(rs.next()){
String name=rs.getString("name");
student=new Student(id, name);
}
//close the statement and Resultset
stmt.close();
rs.close();
return student;
}catch(Exception e){
e.printStackTrace();
}
finally{
if(con!=null)
try {
con.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return student;
}
}
Student.java
package com.rajdeo.jdbcspring;
public class Student {
private int id;
private String name;
public Student(int id, String name) {
// TODO Auto-generated constructor stub
this.id = id;
this.name = 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;
}
}
spring.xml
<?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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd">
<context:annotation-config />
<context:component-scan base-package="com.rajdeo" />
<bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/student" />
<property name="username" value="root" />
<property name="password" value="xxxx" />
</bean>
</beans>
What is error I am not able to understand it any help is appreciated.

Answer 1

Your spring.xml says to scan the package com.rajdeo for components, but your class JdbcDaoImpl is in package com.x.jdbcspring and so it will not be picked up, even though it has a #Component annotation.
Make sure to include the package that contains JdbcDaoImpl in the component scanning process:
<context:component-scan base-package="com.rajdeo, com.x.jdbcspring" />

Answer 2

Looks like you are getting a bean from the context
ctx.getBean("JdbcDaoImpl",JdbcDaoImpl.class)
but in the spring.xml this bean is not defined. As a result you get NPE = java.lang.NullPointerException.
To resolve this issue you have to configure JdbcDaoImpl service. E.g.
<bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/student" />
<property name="username" value="root" />
<property name="password" value="xxxx" />
</bean>
<bean id="JdbcDaoImpl"
class="org.springframework.security.core.userdetails.jdbc.JdbcDaoImpl">
<property name="datasource" ref="datasource"/>
</bean>