Problem with beans.xml

[scorpfrog]

Hi,

im very noob on Spring, and im having problems when running my application. These are my classes:

public interface GreetingProvider {

    public String getGreeting() ;
    
} 

public class MyGreetingProvider implements GreetingProvider {

    public String getGreeting() {
        
        return "Good Morning, World!";
        
    }
    
    

} 

public interface MessageProvider {

    public String getMessage();
    
    public void SetGreetingProvider(GreetingProvider provider);
    
    public GreetingProvider getGreetingProvider();
} 

public class HelloWorldMessageProvider implements MessageProvider {
    
    private GreetingProvider greetingProvider = null;

    public String getMessage() {

        return getGreetingProvider().getGreeting();
    }

    public void SetGreetingProvider(GreetingProvider provider) {
        
        this.greetingProvider = provider ;
        
    }

    public GreetingProvider getGreetingProvider() {
        
        return this.greetingProvider ;
        
    }

} 

<?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-3.0.xsd">
        
    <bean id="renderer" 
          class="com.javapassion.examples.StandardOutMessageRenderer">
        <property name="messageProvider" 
                  ref="provider"/>
    </bean>
    <bean id="provider" 
          class="com.javapassion.examples.HelloWorldMessageProvider">
        <property name="greetingProvider" 
                  ref="greeting"/>
    </bean>
       <bean id="greeting"
             class="com.javapassion.examples.MyGreetingProvider">
    </bean>
</beans>

When i try to run app throws me this error:

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'renderer' defined in class path resource [beans.xml]: Cannot resolve reference to bean 'provider' while setting bean property 'messageProvider'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'provider' defined in class path resource [beans.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'greetingProvider' of bean class [com.javapassion.examples.HelloWorldMessageProvider]: Bean property 'greetingProvider' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:328)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:106)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1325)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1086)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:580)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at com.javapassion.examples.HelloWorldSpringWithDIXMLFile.getBeanFactory(HelloWorldSpringWithDIXMLFile.java:18)
    at com.javapassion.examples.HelloWorldSpringWithDIXMLFile.main(HelloWorldSpringWithDIXMLFile.java:11)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'provider' defined in class path resource [beans.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'greetingProvider' of bean class [com.javapassion.examples.HelloWorldMessageProvider]: Bean property 'greetingProvider' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1361)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1086)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:322)
    ... 16 more
Caused by: org.springframework.beans.NotWritablePropertyException: [B]Invalid property 'greetingProvider' of bean class [com.javapassion.examples.HelloWorldMessageProvider]: Bean property 'greetingProvider' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?[/B]
    at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:1038)
    at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:914)
    at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:76)
    at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:58)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1358)
    ... 24 more 

Words in bold, i guess where is the problem, but i do not have idea about resolve it.

What's the problem?

Many thanks!