Passing Job Parameters to ItemWriter with Late Binding

[praveens]

I have recently started using spring-batch. I am trying to get the file name from Job Parameters that I can use for writer. So I am defining my bean definition for writer as scope="test".

	<bean id="itemWriter" class="org.springframework.batch.item.file.FlatFileItemWriter" scope="step">
	    <property name="resource" value="#{jobParameters['OUTFILE']}" />
	    <property name="lineAggregator">
	        <bean class="org.springframework.batch.item.file.transform.DelimitedLineAggregator">
	            <property name="delimiter" value=","/>
	            <property name="fieldExtractor">
	                <bean class="org.springframework.batch.item.file.transform.BeanWrapperFieldExtractor">
	                    <property name="names" value="policyId,version,vehicleNumber,coverageGroup"/>
	                </bean>
	            </property>
	        </bean>
	    </property>
	</bean>

The code for launcher is

	public void testLaunchJob() throws Exception {
		JobParameters jobParameters = new JobParametersBuilder().addString("owner","NAME").addDate("currentTime", new Date()).addString("OUTFILE", "file:target/test-outputs/output2.txt").toJobParameters();
		sampleJobLauncher.run(job, jobParameters);
	}

I made these changes based on few threads in the spring-batch forum and chapter-5 of spring-batch documentation. But when I run the job, I get the following errors

Caused by: java.io.FileNotFoundException: class path resource [#{jobParameters['OUTFILE']}] cannot be resolved to URL because it does not exist
	at org.springframework.core.io.ClassPathResource.getURL(ClassPathResource.java:162)
	at org.springframework.core.io.AbstractFileResolvingResource.getFile(AbstractFileResolvingResource.java:47)
	at org.springframework.batch.item.file.FlatFileItemWriter.getOutputState(FlatFileItemWriter.java:337)
	... 55 more

Any insights regarding this issue would be of great help.

Thanks,
Praveen

[acamara]

Hi, try to remove the apostrophes when referency the parameter

value="#{jobParameters[OUTFILE]}"

You can look the format in the docs

[praveens]

I tried with and without quotes. But it yeilds same result. I am using Spring 3.0 and Spring batch 2.1.

[snicoll]

you need the quotes. How do you load your job?

[praveens]

If I understand your question correctly, I am loading it using job launcher.

[praveens]

I am loading the spring context/ jobs from Junit testcase. The following is the code which does that

@ContextConfiguration(locations={"/launch-context.xml"})
@RunWith(SpringJUnit4ClassRunner.class)
public class ExampleJobConfigurationTests {
	..........

launch-context.xml has the job launcher configuration and it also imports few other spring configuration files where batch repository and other job definitions are defined.

	<import resource="classpath:batchframework-context.xml" />
	<import resource="classpath:FL-batchjobs-context.xml" />
    
    
	<bean id="jobLauncher"
		class="org.springframework.batch.core.launch.support.SimpleJobLauncher">
		<property name="jobRepository" ref="batchJobRepository" />
	</bean>

[praveens]

Victor,
I already have get/set methods for secondInput. I am enclosing my project. Let me know if you find something odd in the code.


Thanks,
Praveen

[Dave Syer]

You have a mixture of Spring 2.5.6 and Spring 3.0 in there. If you add an explicit dependency on spring-context and spring-aop I think it will work. (The sample project is fixed in trunk by the way, it just didn't make it to STS yet.)

[praveens]

Dave,
It worked after adding explicit dependency. I did not pay attention to the indirect dependency. I just checked spring-core and spring-beans versions and thought everything was OK. I was looking more at job initialization and job config files. Thanks for pointing out. I can move forward now.

Thanks

[victor_jan]

Dave,
Is there any examples for using late-binding, especially for files. Maybe I missed something, but I didn't find a real helpful example. I also spent a lot of time to make it work for me.