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POWhy does the SpringBatch MultiResourcePartitioner not recognize jobParameters? More to the point, what to do about it?
 

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  1. POWhy does the SpringBatch MultiResourcePartitioner not recognize jobParameters? More to the point, what to do about it?
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    <p>It's a pretty straight forward setup. I have a file of potentially 5m records that I need to read and do some work with and then send to the db. The mechanics of processing and writing are not important. I need to be able to pass the path and file name [ /opt/etc/app/partner/input_file.csv ] into the process as a parameter. That's easy enough, add it to the JobParameters and give it to the JobLauncher.</p> <pre><code>JobParametersBuilder jpBuilder = new JobParametersBuilder() ; jpBuilder.addString("filePath", "/opt/etc/app/partner/input_file.csv") ; jobLauncher.run(job, jpBuilder.toJobParameters() ; </code></pre> <p>Done, now to make the context aware of it. Again simple matter of referencing jobParameters.</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:batch="http://www.springframework.org/schema/batch" xsi:schemaLocation=" http://www.springframework.org/schema/batch http://www.springframework.org/schema/batch/spring-batch-2.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"&gt; &lt;description&gt;PoC to demonstrate variable row content handling&lt;/description&gt; &lt;batch:job id="poc" job-repository="jobRepository" incrementer="runIdIncrementer" restartable="true"&gt; &lt;batch:step id="pocReadWriteStep"&gt; &lt;batch:partition step="step" partitioner="partitioner"&gt; &lt;batch:handler task-executor="taskExecutor"/&gt; &lt;/batch:partition&gt; &lt;/batch:step&gt; &lt;/batch:job&gt; &lt;batch:step id="step"&gt; &lt;batch:tasklet task-executor="taskExecutor" throttle-limit="20" transaction-manager="transactionManager" allow-start-if-complete="true"&gt; &lt;batch:transaction-attributes isolation="READ_UNCOMMITTED"/&gt; &lt;batch:chunk reader="reader" processor="processor" writer="writer" commit-interval="20"&gt; &lt;/batch:chunk&gt; &lt;/batch:tasklet&gt; &lt;/batch:step&gt; &lt;bean id="reader" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step"&gt; &lt;property name="resource" value="file:#{jobParameters['filePath']}"/&gt; &lt;property name="lineMapper"&gt; &lt;bean class="org.springframework.batch.item.file.mapping.PatternMatchingCompositeLineMapper"&gt; &lt;property name="tokenizers"&gt; &lt;map&gt; &lt;entry key="*" value-ref="lineTokenizer"/&gt; &lt;/map&gt; &lt;/property&gt; &lt;property name="fieldSetMappers"&gt; &lt;map&gt; &lt;entry key="*" value-ref="fieldSetMapper"/&gt; &lt;/map&gt; &lt;/property&gt; &lt;/bean&gt; &lt;/property&gt; &lt;/bean&gt; &lt;bean id="lineTokenizer" class="org.springframework.batch.item.file.transform.DelimitedLineTokenizer"/&gt; &lt;bean id="fieldSetMapper" class="org.springframework.batch.item.file.mapping.PassThroughFieldSetMapper"/&gt; &lt;bean id="processor" class="com.verifi.springbatchpoc.PocProcessor"/&gt; &lt;bean id="writer" class="com.verifi.springbatchpoc.PocWriter"/&gt; &lt;bean id="runIdIncrementer" class="org.springframework.batch.core.launch.support.RunIdIncrementer"/&gt; &lt;bean id="partitioner" class="org.springframework.batch.core.partition.support.MultiResourcePartitioner"&gt; &lt;property name="resources" value="file:#{jobParameters['filePath']}"/&gt; &lt;/bean&gt; &lt;bean id="taskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor"&gt; &lt;property name="corePoolSize" value="20"/&gt; &lt;/bean&gt; &lt;/beans&gt; </code></pre> <p>Except that in the MultiResourcePartitioner it can't seem to recognize the reference to jobParameters. I can hard code the path and file name and it's quite happy, but that doesn't carry the mail for this implementation.</p> <p>Since I'm sure someone is going to ask, here's the stack trace from the error (well part of it anyway).</p> <pre><code> at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1086) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517) ... 46 more Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 0): Field or property 'jobParameters' cannot be found on object of type 'org.springframework.beans.factory.config.BeanExpressionContext' at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:207) at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:71) at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:52) at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:102) at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:97) at org.springframework.expression.common.CompositeStringExpression.getValue(CompositeStringExpression.java:82) at org.springframework.expression.common.CompositeStringExpression.getValue(CompositeStringExpression.java:1) at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:138) ... 52 more </code></pre> <p>Thoughts, comments, suggestions?</p>
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