RESOLVIDO! Ajuda com Spring

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#1

Galera estou comecando no mundo do spring framework, achei esse tutorial aqui na net http://eclipse.dzone.com/news/springide-using-spring-eclipse?page=0%2C1

Estou com seguinte problema quando tento rodar a classe “Tester” dá o seguinte erro:

28/11/2008 16:08:47 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.FileSystemXmlApplicationContext@1bca5f1: display name [org.springframework.context.support.FileSystemXmlApplicationContext@1bca5f1]; startup date [Fri Nov 28 16:08:47 BRST 2008]; root of context hierarchy
28/11/2008 16:08:47 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from file [C:\diogo_webapps\workspace\SampleBeanImple\beanDefinition.xml]
28/11/2008 16:08:47 org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
INFO: Bean factory for application context [org.springframework.context.support.FileSystemXmlApplicationContext@1bca5f1]: org.springframework.beans.factory.support.DefaultListableBeanFactory@18235ed
28/11/2008 16:08:47 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@18235ed: defining beans [sample,interceptor,proxyBean]; root of factory hierarchy
28/11/2008 16:08:47 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletons
INFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@18235ed: defining beans [sample,interceptor,proxyBean]; root of factory hierarchy
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sample' defined in file [C:\diogo_webapps\workspace\SampleBeanImple\beanDefinition.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.ISampleBean]: Specified class is an interface
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:883)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:839)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:440)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380)
	at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:140)
	at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:84)
	at com.Tester.loadContext(Tester.java:16)
	at com.Tester.main(Tester.java:23)
Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.ISampleBean]: Specified class is an interface
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:51)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:877)
	... 17 more

O que tem de errado no meu exemplo?

#2

org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [com.ISampleBean]: Specified class is an interface

Você deve referênciar no xml a implementação e não a interface.

#3

Nao entendi muito bem o que vc quis dizer pode ser mais claro, vou te passar meu xml

beanDefinition.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-2.0.xsd">
  
	 <bean id="sample" class="com.ISampleBean"></bean>
     <bean id="interceptor" class="com.Interceptor"></bean>  
     
     <bean id="proxyBean" class="org.springframework.aop.framework.ProxyFactoryBean">  
         <property name="proxyInterfaces">  
             <value>com.ISampleBean</value>  
         </property>  
         <property name="interceptorNames">  
             <list>  
                 <value>interceptor</value>
             </list>
         </property>  
         <property name="target">  
             <ref local="sample" ></ref>
         </property>  
         <property name="proxyTargetClass">  
             <value>true</value>
         </property>  
     </bean>  
     
</beans>

Tester.java

package com;

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

 public class Tester {   
  
     private static ApplicationContext context;  
       
     /** 
      * Load up the Spring container  
      */  
     private void loadContext()  
     {  
         String filename = "beanDefinition.xml";    
         context = new FileSystemXmlApplicationContext(filename);  
     }  
       
     public static void main(String[] args)   
     {  
           
         Tester test = new Tester();  
         test.loadContext();  
         //reference the proxy through the Spring container  
         SampleBean sb = (SampleBean)context.getBean("proxyBean");  
         sb.setName("New Name");  
     }  
 }
#4 
 <bean id="sample" class="com.ISampleBean"></bean>

Não deveria referenciar a implementação “com.SampleBean” ?

#5

OK, fiz a mudanca e apareceu a seguinte mensagem:


28/11/2008 16:39:45 org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.FileSystemXmlApplicationContext@16b13c7: display name [org.springframework.context.support.FileSystemXmlApplicationContext@16b13c7]; startup date [Fri Nov 28 16:39:45 BRST 2008]; root of context hierarchy
28/11/2008 16:39:45 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from file [C:\diogo_webapps\workspace\SampleBeanImple\beanDefinition.xml]
28/11/2008 16:39:45 org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
INFO: Bean factory for application context [org.springframework.context.support.FileSystemXmlApplicationContext@16b13c7]: org.springframework.beans.factory.support.DefaultListableBeanFactory@476128
28/11/2008 16:39:45 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@476128: defining beans [sample,interceptor,proxyBean]; root of factory hierarchy

Intercepted method - class com.SampleBean - setName

Tá certo isso?

#6

a principio sim, seu interceptor foi executado quando o método setName foi chamado.

#7

Blz, mais ele nao tinha que me retonar “New Name”?

 sb.setName("New Name");

E que nao entendi bem o que teria que retornar pelo proposito do exemplo!!!

#8

nao coloquei minha as outras classes do exemplo

Interceptor

package com;

 import org.aopalliance.intercept.MethodInterceptor;  
 import org.aopalliance.intercept.MethodInvocation;  

public class Interceptor implements MethodInterceptor {

	  @Override  
	     public Object invoke(MethodInvocation methodInv) throws Throwable   
	     {  
	         System.out.println("Intercepted method - " + methodInv.getMethod().getDeclaringClass()   
	         + " - " + methodInv.getMethod().getName());  
	         // TODO Auto-generated method stub  
	           
	         return null;  
	    }  

}

ISampleBean.java

package com;
 public interface ISampleBean{   
   
        public void setName(String name);  
        public String getName();  
          
        public void setAge(String age);  
        public String getAge();  
 }

SampleBean.java

package com;

public class SampleBean implements ISampleBean {

	@Override
	public String getAge() {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public String getName() {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void setAge(String age) {
		// TODO Auto-generated method stub

	}

	@Override
	public void setName(String name) {
		// TODO Auto-generated method stub

	}

}

E ai?

#9

Parece ser um exemplo simples com interceptor. Nada de especial.
Você aprendeu a iniciar o applicationcontext spring (através de FileSystemXmlApplicationContext) e obter um bean com interceptor através desse applicationcontext (context.getBean(“proxyBean”)).

Após, procure por exemplos de spring com apps web e anotações, fica bacana.

#10

legal cara valeu pela atencao ate o fim, hehehe
vou seguir tua recomendacao, obrigado :smiley:

#11