spring 3 accessing EJB3

[greengold]

Hi all!

Please can you tell me what's wrong or what Im am missing in order to access EJB within Spring?
here's my applicaation context 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:jee="http://www.springframework.org/schema/jee"
	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
        http://www.springframework.org/schema/jee
		http://www.springframework.org/schema/jee/spring-jee-3.0.xsd">
		                       
<!-- 
	<context:component-scan base-package="sk.skhplus.retail.controller" />
 
 
 <jee:local-slsb id="material"
jndi-name="skh-retail/MaterialDaoBean"
business-interface="sk.skhplus.core.material.ejb.intf.MaterialDaoLocal"/>
 -->
 
 
 <bean id="hello" class="sk.skhplus.retail.controller.HelloWorldController"></bean>
 
 <bean id="data" class="sk.skhplus.retail.controller.DataSourceController"></bean>

	<bean id="viewResolver"
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
		<property name="prefix" value="/jsp/" />
		<property name="suffix" value=".jsp" />
	</bean>

		
		<bean id="materialBean"
		class="org.springframework.ejb.access.LocalStatelessSessionProxyFactoryBean">
		<property name="jndiName" value="skh-retail/MaterialDaoBean" />
		<property name="businessInterface" value="sk.skhplus.core.material.ejb.intf.MaterialDaoLocal"/>
		<property name="resourceRef" value="true" />
		</bean>
		 
		
		<bean id="dataSource"
		class="sk.skhplus.retail.controller.DataSourceController">
		<property name="materialDaoBean" ref="materialBean" />
		</bean>
		 
		 

   </beans>

and here is what jBoss is saying:

11:20:13,152 INFO  [DefaultListableBeanFactory] Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@7796af5d: defining beans [hello,data,viewResolver,materialBean,dataSource]; parent: org.springframework.beans.factory.support.DefaultListableBeanFactory@5f890954
11:20:13,152 ERROR [DispatcherServlet] Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in ServletContext resource [/WEB-INF/springmvc-servlet.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type '$Proxy280 implementing sk.skhplus.core.material.ejb.intf.MaterialDaoLocal,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised' to required type 'sk.skhplus.core.material.ejb.MaterialDaoBean' for property 'materialDaoBean'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [$Proxy280 implementing sk.skhplus.core.material.ejb.intf.MaterialDaoLocal,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [sk.skhplus.core.material.ejb.MaterialDaoBean] for property 'materialDaoBean': no matching editors or conversion strategy found
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)

I know this is perhaps trivial, but Im newbie in spring and I need this for my project. As I have read articles about accessing EJBs that declarations should be enought.
excuse my english, its not my primary language .

Thanks for help!

[Marten Deinum]

I suggest the search as it seems you are making the classic error of trying to convert a proxy to a concrete implementation. You should program to interfaces and not concrete implementations, also since you are using EJB3 you should have enough on a simple JNDI lookup so there should be no need for a full jee lookup.

[greengold]

How do you know form that scratch of code that Im doing implementation programming?

citing from Spring In Action 2nd edition:

Declaring EJB 3 session beans in Spring
As I mentioned earlier, EJB 3 simplifies the session bean lookup process by elimi-
nating the notion of a home interface. Instead of looking up a session bean
through a home interface that was retrieved through JNDI, EJB 3 session beans are
retrieved directly from JNDI.
.
.
.

Fortunately, Spring provides the ability to wire JNDI-stored objects just like any
other bean in the application context. The trick involves using Spring’s JndiOb-
jectFactoryBean. The following snippet of XML from the Spring application
context shows how you might declare an EJB 3 traffic service session bean:
<bean id="trafficService"
class="org.springframework.jndi.JndiObjectFactoryB ean">
<property name="jndiName" value="ejb/TrafficService" />
<property name="resourceRef" value="true" />
</bean>
As a factory bean, JndiObjectFactoryBean produces a proxy to the real session
bean (see figure 11.2), which it looks up from a JNDI repository using the jndi-
Name property. The resourceRef property indicates that the EJB should be looked
up as a Java resource, in effect prefixing the value of jndiName with java:comp/
env/ before performing the lookup.


..perhaps I didn't got it right, so can you please tell me where Im doing mistake?

[Marten Deinum]

How do you know form that scratch of code that Im doing implementation programming?

By looking at your stack trace.

Cannot convert value of type [$Proxy280 implementing sk.skhplus.core.material.ejb.intf.MaterialDaoLocal,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [sk.skhplus.core.material.ejb.MaterialDaoBean] for property 'materialDaoBean': no matching editors or conversion strategy found

You create a proxy which implements MaterialDaoLocal (well the lookup does that) and you expect to convert it to a concrete implementation (MaterialDaoBean) because it is a dynamic proxy that isn't obviously isn't going to work. You should program to the interface (MaterialDaoLocal)...

[greengold]

okay, its resolved by reffering to bean INTERFACE in bean deffinition like:

<bean id="materialBean"
		class="org.springframework.ejb.access.LocalStatelessSessionProxyFactoryBean">
		<property name="jndiName" value="skh-retail/MaterialDaoBean/Local" />
		<property name="businessInterface" value="sk.skhplus.core.material.ejb.intf.MaterialDaoLocal"/>
		<property name="resourceRef" value="true" />
		</bean>

Thanks for interest and help!

[zefina]

Wanted to invoke service object from Spring webflow Action class, since the service objects on EJB container, not sure how to autowire the service in Web layer

[abhish]

Hello greenGold,

I was trying to develop the same application but was unsuccessful.Can u please help me out in this as i am new to both spring and Ejb. I was constantly getting the error ejb not bound.
Problem was my bean was not able to bind. Can you please tell me a small tutorial how to bind EJB and spring and hibernate.
And your EJB was in different project altogether or in the same one
Please help me out in this