Problem running Spring Application

[chandan kumar mitwaa]

Hi everyone,

I am new to Spring. This is my first Spring Application but I was unable to successfully run it. I have tried a lot but I am not getting the reason why it is not running.

Application name: SequenceGenerator


bean.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"
      xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
      <bean id="sequenceGenerator" class="mit.SequenceGenerator">
            <property name="prefix" value="30" />
            <property name="suffix" value="A" />
            <property name="initial" value="10000" />
      </bean>
</beans> 

SequenceGenerator.java

   package mit;

public class SequenceGenerator
{
	private String prefix;
	private String suffix;
	private int initial;
	private int counter;

	public String getPrefix()
	{
		return prefix;
	}

	public void setPrefix(String prefix)
	{
		this.prefix = prefix;
	}

	public String getSuffix()
	{
		return suffix;
	}

	public void setSuffix(String suffix)
	{
		this.suffix = suffix;
	}

	public int getInitial()
	{
		return initial;
	}

	public void setInitial(int initial)
	{
		this.initial = initial;
	}

	public int getCounter()
	{
		return counter;
	}

	public void setCounter(int counter)
	{
		this.counter = counter;
	}

	public synchronized String getSequence()
	{
		StringBuffer buffer = new StringBuffer();
		buffer.append(prefix);
		buffer.append(initial + counter++);
		buffer.append(suffix);
		return buffer.toString();
	}

}
 

Main.java

   package mit;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main
{

	/**
	 * @param args
	 */
	public static void main(String[] args)
	{
		ApplicationContext context = new ClassPathXmlApplicationContext("bean.xml");
		SequenceGenerator generator = (SequenceGenerator) context.getBean("sequenceGenerator");
		System.out.println(generator.getSequence());
		System.out.println(generator.getSequence());
	}

} 

When I press the run button in eclipse the Output is :

  Feb 15, 2010 11:45:05 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@b6ece5: startup date [Mon Feb 15 11:45:05 IST 2010]; 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:458)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:388)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
	at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
	at mit.Main.main(Main.java:14)
Caused by: java.lang.NullPointerException
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.<clinit>(DefaultListableBeanFactory.java:103)
	... 7 more
  

Please help me on this.

[Vivek K Singh]

The program has no faults in it, It works fine on my machine

Just check your classpath for conflicting jar files (Different version of files)

[chandan kumar mitwaa]

Hello Vivek

I am using eclipse. I created a new project using New Spring Project wizard. I had downloaded Spring framework 3 from the official spring site. Now I extracted it somewhere on my computer. Then I add the jar files in the folder "dist" to my project classpath.

The structure as it appears in my Project Explorer is like this:

SequenceGenerator

:Spring Elements
:Beans
>bean.xml
:src
:mit
>Main.java
>SequenceGenerator.java
@JRE System Library

#org.springframework.aop-3.0.0.RELEASE.jar
#org.springframework.asm-3.0.0.RELEASE.jar
#org.springframework.aspects-3.0.0.RELEASE.jar
#org.springframework.beans-3.0.0.RELEASE.jar
#org.springframework.context-3.0.0.RELEASE.jar
#org.springframework.context.support-3.0.0.RELEASE.jar
#org.springframework.core-3.0.0.RELEASE.jar
#org.springframework.expression-3.0.0.RELEASE.jar
#org.springframework.instrument-3.0.0.RELEASE.jar
#org.springframework.instrument.tomcat-3.0.0.RELEASE.jar
#org.springframework.jdbc-3.0.0.RELEASE.jar
#org.springframework.jms-3.0.0.RELEASE.jar
#org.springframework.orm-3.0.0.RELEASE.jar
#org.springframework.oxm-3.0.0.RELEASE.jar
#org.springframework.spring-library-3.0.0.RELEASE.libd
#org.springframework.test-3.0.0.RELEASE.jar
#org.springframework.transaction-3.0.0.RELEASE.jar
#org.springframework.web-3.0.0.RELEASE.jar
#org.springframework.web.portlet-3.0.0.RELEASE.jar
#org.springframework.web.servlet-3.0.0.RELEASE.jar
#org.springframework.web.struts-3.0.0.RELEASE.jar


Please help me on this, what am I missing?