problem in my Spring Application program

[ganesh pol]

request to all the people who contol this forum please start the section for Spring also

now my problem

i have created 2 java classes

public interface Hello { 
   public String sayhello(String a); 
 
} 
 

public class HelloImpl implements Hello { 
 
private String greeting;
private Object obj;

 
public HelloImpl(){ 
} 

[B]public void setObject(Object obj){
this.obj=obj;
}
 
public Object getObject(){
 return this.obj;
}[/B]
public HelloImpl(String a){ 
greeting=a; 
} 
 
public String sayhello(String s){ 
return greeting+s; 
}

public void setGreeting(String a){ 
this.greeting=a; 
} 
} 
 

 
import java.io.*; 
import org.springframework.beans.factory.*; 
import org.springframework.beans.factory.xml.*; 
import org.springframework.core.io.*; 
 
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
public class HelloClient  
{ 
   public static void main(String args[])  throws Exception 
   {
HelloImpl bean1 =null;
      try{ 
System.out.println("please Wait \n."); 
ApplicationContext cont=new FileSystemXmlApplicationContext("hello.xml");
System.out.println("\n *********************************************\n ");
System.out.println("bean class type is  "+cont.getType("hello"));
System.out.println("*********************************************");
bean1 = (HelloImpl)cont.getBean("hello"); 
} 
catch(Exception e1){
e1.printStackTrace();
} 
String s=null;
Object o=null;
try{    
s = bean1.sayhello(args[0]);
[B]o=bean1.getObject();[/B]
System.out.println(s); 
System.out.println("object is"+o);
}
catch(ArrayIndexOutOfBoundsException ex){
System.out.println("arg[0] is not provided");
}
 }     
} 
 

my xml file is as follows

<beans>

<beanid="hello"
class="HelloImpl">

<property name="greeting">
<value>
shubh prabhat!...
</value>
</property>

<property name="obj">
<ref bean="java.lang.Object"/>
</property>
</bean>

</beans>


and when i suppose to run HelloClient.java
it gives me erroe like this

INFO: Unable to locate ApplicationEventMulticaster with name 'applicationEventMulticaster': using default [org.spri
ngframework.context.event.SimpleApplicationEventMulticaster@1ad086a]
16-Nov-2005 19:11:33 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in factory [org.springframework.beans.factory.support.DefaultListableBeanFactory
defining beans [hello]; root of BeanFactory hierarchy]
16-Nov-2005 19:11:33 org.springframework.beans.factory.support.AbstractBeanFactory destroySingletons
INFO: Destroying singletons in factory {org.springframework.beans.factory.support.DefaultListableBeanFactory defini
ng beans [hello]; root of BeanFactory hierarchy}
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hello' defined in file [C:\
spring_examples\hello.xml]: Can't resolve reference to bean 'java.lang.Object' while setting property 'obj'; nested
exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'java.lang.Object' is
defined: org.springframework.beans.factory.support.DefaultListableBeanFactory defining beans [hello]; root of BeanF
actory hierarchy
org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'java.lang.Object' is defined: org.s
pringframework.beans.factory.support.DefaultListableBeanFactory defining beans [hello]; root of BeanFactory hierarc
hy
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBe
anFactory.java:349)
at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedBeanDefinition(AbstractBeanFactor
y.java:671)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:198)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:147)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionVal
ueResolver.java:176)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefini
tionValueResolver.java:105)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(Abstrac
tAutowireCapableBeanFactory.java:1012)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowi
reCapableBeanFactory.java:823)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowire
CapableBeanFactory.java:345)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:226)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:147)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultLis
tableBeanFactory.java:275)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:3
18)
at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationConte
xt.java:83)
at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationConte
xt.java:68)
at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationConte
xt.java:59)
at HelloClient.main(HelloClient.java:17)
Exception in thread "main" java.lang.NullPointerException
at HelloClient.main(HelloClient.java:29)

C:\spring_examples>

[Ernest Friedman-Hill]

Spring questions go in our application frameworks forum. I will move this there for you.

[Karthik Guru]

 
<beans>
 
<bean id="hello" class="HelloImpl"> 
 
<property name="greeting"> 
<value>
shubh prabhat!...
</value> 
</property>
 
<property name="obj"> 
  <bean class="java.lang.Object"/>
</property>
</bean> 
 
</beans> 
 
in your HelloImpl
 
the instance variable s'd be 
 
Object obj;
 
and methods -
 
setObj()
getObj()
 

I guess you are getting started with Spring. Search for some better Spring tutorials and interesting examples that explains the concept well.