Need to make a simple spring 3 example work

Question

I am learning spring 3 from a book and I get an exception in the first example itself. It is given below. My project can be downloaded as a zip file from the link - https://github.com/double-whammy/prospring3.git

My environment - Eclipse STS (Eclipse for Spring)

Exception:

INFO t.support.ClassPathXmlApplicationContext: 456 - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@497e4b: startup date [Wed Jul 23 10:05:47 PDT 2014]; 
root of context hierarchy
INFO eans.factory.xml.XmlBeanDefinitionReader: 315 - Loading XML bean definitions from class path resource [META-INF/spring/app-context.xml]

Exception in thread "main" org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 13 in XML document from class path resource [META-INF/spring/app-context.xml] is invalid; nested exception is org.xml.sax.SAXParseException; lineNumber: 13; columnNumber: 38; The prefix "p" for attribute "p:messageProvider-ref" associated with an element type "bean" is not bound.
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:396)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:212)
    at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:126)
    at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:92)
    at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:130)
    at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:467)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:397)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at com.apress.prospring3.ch2.HelloWorldSpringDI.main(HelloWorldSpringDI.java:9)
Caused by: org.xml.sax.SAXParseException; lineNumber: 13; columnNumber: 38; The prefix "p" for attribute "p:messageProvider-ref" associated with an element type "bean" is not bound.
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
    at org.springframework.beans.factory.xml.DefaultDocumentLoader.loadDocument(DefaultDocumentLoader.java:75)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:388)
    ... 14 more

Spring XML Application Configuration xml file:

<?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:p="http://www.springframework.org/schema/p" 
xmlns:context="http://www.springframework.org/schema/context" 
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-3.0.xsd"> 
<bean id="provider" class="com.apress.prospring3.ch2.HelloWorldMessageProvider"/> 
<bean id="renderer" class="com.apress.prospring3.ch2.StandardOutMessageRenderer" 
p:messageProvider-ref="provider"/> 
</beans>

Answer 1

It is because your xml is a invalid:

the header has a mistake: there the xsi attribute value needs its double quotes!

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

---

<bean id="renderer" class="com.apress.prospring3.ch2.StandardOutMessageRenderer" p:messageProvider-ref="provider"/>

I do not know what you want to configure, but a p:messageProvider-ref as an attribute is invalid xml.

I thing you wanted to express something like a bean renderer of type StandardOutMessageRenderer that use the bean provider for its MessageProvider.

<bean id="provider" class="com.apress.prospring3.ch2.HelloWorldMessageProvider"/> <bean id="renderer" class="com.apress.prospring3.ch2.StandardOutMessageRenderer"><property name="messageProvider" ref="provider"/></bean>