Getting error while dynamically providing input,output path - spring

Question

I have created a multi-file reader and flat file writer (Later, I have to extend it to multifile read to multiple file write, one to one mapping). When i provide the input path through property file, It works all good, but when I try to provide path through jobExecutionContext it starts giving me error. What surprises me is that writer is successfully taking the path from executionContext and writing whatever location i provide but not the reader.
PS: I am using "SingleItemPeekableItemReader" because the data i have in file is multi-line record and has no way to determine when one record ends . the only way to know that record 2 has started is when you have access to next line and you know that its start of new record.
Can someone through some light, What wrong i am doing.
<bean id="itemReader" class="com.varun.reader.AccountDataReader">
<property name="fieldSetReader" ref="PeekableitemReader" />
<property name="headerFieldSetMapper" ref="headerFieldSetMapper" />
<property name="multiReader" ref="multiResourceReader"/>
</bean>
<bean id="PeekableitemReader" class="org.springframework.batch.item.support.SingleItemPeekableItemReader" >
<property name="delegate" ref="multiResourceReader"/>
</bean>
<bean id="multiResourceReader" class=" org.springframework.batch.item.file.MultiResourceItemReader" >
<property name="resources" value="file:${file.input.dir}*.DAT" />
<property name="delegate" ref="fileItemReader" />
</bean>
<bean id="fileItemReader" class="org.springframework.batch.item.file.FlatFileItemReader">
<property name="lineMapper">
<bean class="org.springframework.batch.item.file.mapping.DefaultLineMapper">
<property name="lineTokenizer" ref="accountDataTokenizer"/>
<property name="fieldSetMapper">
<bean class="org.springframework.batch.item.file.mapping.PassThroughFieldSetMapper" />
</property>
</bean>
</property>
<property name="comments" value=""></property>
</bean>
It error out, when i provide the resources in multiresourceReader as below
<property name="resources" value="file:#{JobExecutionContext[input_dir]}*.DAT" />
Error logs as below:
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'step1': Cannot resolve reference to bean 'itemReader' while setting bean property 'itemReader'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'itemReader' defined in class path resource [spring/config/process-config.xml]: Cannot resolve reference to bean 'PeekableitemReader' while setting bean property 'fieldSetReader'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'PeekableitemReader' defined in class path resource [spring/config/process-config.xml]: Cannot resolve reference to bean 'multiResourceReader' while setting bean property 'delegate'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'multiResourceReader' defined in class path resource [spring/config/process-config.xml]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 0): Property or field 'JobExecutionContext' cannot be found on object of type 'org.springframework.beans.factory.config.BeanExpressionContext' - maybe not public?
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:359)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1481)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1226)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:753)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
after making multireader scope as step i am getting error as below.I have tried putting scope on all the other delegate readers as well, but i am getting the same error.
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'step1': Cannot resolve reference to bean 'itemReader' while setting bean property 'itemReader'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'itemReader' defined in class path resource [spring/config/process-config.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type [com.sun.proxy.$Proxy11 implementing org.springframework.batch.item.ItemStreamReader,org.springframework.batch.item.ItemStream,org.springframework.aop.scope.ScopedObject,java.io.Serializable,org.springframework.aop.framework.AopInfrastructureBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [org.springframework.batch.item.file.MultiResourceItemReader] for property 'multiReader'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [com.sun.proxy.$Proxy11 implementing org.springframework.batch.item.ItemStreamReader,org.springframework.batch.item.ItemStream,org.springframework.aop.scope.ScopedObject,java.io.Serializable,org.springframework.aop.framework.AopInfrastructureBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised] to required type [org.springframework.batch.item.file.MultiResourceItemReader] for property 'multiReader': no matching editors or conversion strategy found
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:359)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1481)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1226)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:753)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.varun.JobScheduler.main(JobScheduler.java:9)
My custom Reader
public class AccountDataReader implements ItemReader<AccountDataBO> {
private static Log log = LogFactory.getLog(AccountDataReader.class);
private boolean recordFinished;
private AccountDataBO acctObj = new AccountDataBO();
private SingleItemPeekableItemReader<FieldSet> fieldSetReader;
private HeaderFieldSetMapper headerFieldSetMapper;
private MultiResourceItemReader<FieldSet> multiReader;
#Override
public AccountDataBO read() throws Exception {
recordFinished = false;
while (!recordFinished) {
process(fieldSetReader.read());
}
AccountDataBO result = acctObj;
acctObj = new AccountDataBO();
return result;
}
private void process(FieldSet fieldSet) throws Exception {
if (fieldSet == null) {
log.debug("FINISHED Reading");
recordFinished = true;
acctObj=null;
return;
}
String lineId = fieldSet.readString(0);
if (!StringUtils.isEmpty(lineId) && lineId.contains(AccountDataBO.ACCOUNT)) {
log.debug("Starting new Record");
acctObj.setHeader(headerFieldSetMapper.mapFieldSet(fieldSet));
acctObj.setResource(multiReader.getCurrentResource());
}
//Code
}
private void CheckEOFNewAccount() throws Exception {
if ((fieldSetReader.peek() != null
&& ((fieldSetReader.peek().getValues())[0].contains(AccountDataBO.ACCOUNT)))
|| fieldSetReader.peek() == null) {
log.debug("Next Line is Account or EOF Hence returning for current Account");
recordFinished = true;
return;
}
}
public void setFieldSetReader(SingleItemPeekableItemReader<FieldSet> fieldSetReader) {
this.fieldSetReader = fieldSetReader;
}
public void setHeaderFieldSetMapper(HeaderFieldSetMapper headerFieldSetMapper) {
this.headerFieldSetMapper = headerFieldSetMapper;
}
public void setMultiReader(MultiResourceItemReader<FieldSet> multiReader) {
this.multiReader = multiReader;
}
}

Answer 1

In order to inject job parameters into a batch component, the component needs to be step scoped. So in your example, change this:
<bean id="multiResourceReader"
class=" org.springframework.batch.item.file.MultiResourceItemReader" >
To this:
<bean id="multiResourceReader"
class=" org.springframework.batch.item.file.MultiResourceItemReader"
scope="step" >