Problem using #{jobExecutionContext[${batchConfig.resources.sourceDatabase}]}

[vinvh]

Hi,
I am using Spring Batch 2.0.0 and try to use the late binding feture to load the data source through execution context. Here is the bean defination -

<beans:bean id="testSRC" class="org.springframework.orm.ibatis.SqlMapClient FactoryBean">
<beansroperty name="dataSource" value="#{jobExecutionContext[${batchConfig.resources.sourceDatabase}]}" />
<beansroperty name="configLocation" value="ibatis-config.xml" />
</beans:bean>

The data source is fetched from JNDI resource and loaded in execution context with Job listener in beforeStart().

When I run this batch I get following error -

org.springframework.beans.TypeMismatchException: Failed to convert property value of type [java.lang.String] 
to required type [javax.sql.DataSource] for property 'dataSource'; 
.......

So is it means that through late binding only String can be passed?

[Dave Syer]

Did you try that with Spring 3.0?

[Dave Syer]

...and by the way: it's not a great idea to put a DataSource in an ExecutionContext (it may be Serializable, but I wouldn't want to rely on it). There must be a better way.

[vinvh]

Thanks Dave,
Actually Datasource is just one example. There will be other type of objects I want to handle through this feature.

I am trying this with Spring Batch 2.0 and Spring 2.5 as these are stable release.

Other option i am trying with the help of org.springframework.beans.factory.config.MethodInv okingFactoryBean to get through a wrapper class.

<beans:bean id="resources"  
        class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
        <beans:property name="targetObject" ref="resourceManagerWrapper" />
        <beans:property name="targetMethod" value="getResource" />
        <beans:property name="arguments">
            <beans:list>
                <beans:value>${batchConfig.resources.sourceDatabase}</beans:value>
            </beans:list>
        </beans:property>
    </beans:bean>

But need some help that how can i call this method in the xml to get the data source?

[Dave Syer]

Try <ref bean="${...}"/> in your list. If your ResourceManagerWrapper could be refactored so the dependency can be injected normally that would be much easier to use and to read. This is basic Spring DI stuff, so maybe you should hang out in the Spring Framework forum for a bit and do some reading on that?