How use an innerbean for the prototypeBeanName property

[dr_pompeii]

Hello Members

I have the follow and work fine

...
<property name="lineMapper" >
	<bean class="org.springframework.batch.item.file.mapping.DefaultLineMapper" >
 		<property name="lineTokenizer" >
                        ...
	      	</property>
		<property name="fieldSetMapper" >
		        <bean class="org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper" >
		  		<property name="prototypeBeanName" value="tasaCastigoInteres"/>		  			
		  	</bean>
		</property>
	</bean>			
</property>
...

<bean id="tasaCastigoInteres" 
 	 class="com.manuel.jordan.domain.TasaCastigoInteres" 
     scope="prototype" 	      
 	      />

How I can put the bean tasaCastigoInteres how an inner bean for the prototypeBeanName property? Since this property expects a String value?

Thanks in advanced

[Marten Deinum]

You aren't ... You are directly setting the value not a reference. So basically your bean 'tasaCastigoInteres' doesn't do anything...

[dr_pompeii]

Hi Marten

You aren't ... You are directly setting the value not a reference.

Yes, I know

This property (prototypeBeanName) must work with a value and not with a ref. Otherwise I get an exception.

I mean, If I use

...
<property name="lineMapper" >
	<bean class="org.springframework.batch.item.file.mapping.DefaultLineMapper" >
 		<property name="lineTokenizer" >
                        ...
	      	</property>
		<property name="fieldSetMapper" >
		        <bean class="org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper" >
		  		<property name="prototypeBeanName" ref="tasaCastigoInteres"/>		  			
		  	</bean>
		</property>
	</bean>			
</property>
...

<bean id="tasaCastigoInteres" 
 	 class="com.manuel.jordan.domain.TasaCastigoInteres" 
     scope="prototype" 	      
 	      />

I get

Caused by: java.lang.IllegalStateException: 
Cannot convert value of type 
[com.manuel.jordan.domain.TasaCastigoInteres] to required type [java.lang.String] for property 'prototypeBeanName': 
no matching editors or conversion strategy found
	at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:241)

I thought that could exists a way to turn around this with an inner bean like the follow.

<property name="fieldSetMapper" >
	<bean class="org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper" >
		<property name="prototypeBeanName" >
			<bean  
 	   			class="com.manuel.jordan.domain.TasaCastigoInteres" 
 	   			scope="prototype"
 	   		/>
		</property>		  			
	</bean>
</property>

But I get the same exception

So basically your bean 'tasaCastigoInteres' doesn't do anything...

No really

If I do

...
<property name="lineMapper" >
	<bean class="org.springframework.batch.item.file.mapping.DefaultLineMapper" >
 		<property name="lineTokenizer" >
                        ...
	      	</property>
		<property name="fieldSetMapper" >
		        <bean class="org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper" >
		  		<property name="prototypeBeanName" ref="tasaCastigoInteres"/>		  			
		  	</bean>
		</property>
	</bean>			
</property>
...
<!--
<bean id="tasaCastigoInteres" 
 	 class="com.manuel.jordan.domain.TasaCastigoInteres" 
     scope="prototype" 	      
/>
-->

I get

Caused by: 
org.springframework.beans.factory.NoSuchBeanDefinitionException: 
No bean named 'tasaCastigoInteres' is defined
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:553)

I hope you see now my point.

[Marten Deinum]

All the configurations you posted, which lead to an exception, are at runtime the same configurations.

But I get the same exception

No really

Your sample posted yes it doesn't do anything because it is a value... If you change it to a ref it doesn't work no matter if you use an inner bean or not it will never be a string it is a bean of a certain type...

I hope you see now my point.

I still don't see your point or what you want to achieve. The property is of a type string and can only be set to a string nothing more, nothing less. YOur bean, regardless if it is defined of a ref or inner-bean, remains something else as a String it will never become a String.

If you want the property to change on each execution make it step-scoped and use late binding (as explained in the spring batch reference guide).

[mminella]

THe issue here is due to the prototype scope. Using ref implies that it's a reference to a bean, a single instance of a class. In this case, that is not what that property is. The BeanWrapperFieldSetMapper will create a new instance every time the bean is needed. You'll have to look in the core Spring docs to see if there is a way to define a prototype bean inline like you can a regular bean (I would suspect you can't).