spring - 使用注释的多资源项读取器

Question

 2015-11-24 15:56:32,512 [main] ERROR org.springframework.batch.core.step.AbstractStep:229[execute] - Encountered an error executing step multiThreadedStep in job extractJob
 java.lang.IllegalStateException: No resources to read. Set strict=false if this is not an error condition.
    at org.springframework.batch.item.file.MultiResourceItemReader.open(MultiResourceItemReader.java:173) ~[spring-batch-infrastructure-3.0.5.RELEASE.jar:3.0.5.RELEASE]
    at org.springframework.batch.item.support.CompositeItemStream.open(CompositeItemStream.java:96) ~[spring-batch-infrastructure-3.0.5.RELEASE.jar:3.0.5.RELEASE]
    at org.springframework.batch.core.step.tasklet.TaskletStep.open(TaskletStep.java:310) ~[spring-batch-core-3.0.5.RELEASE.jar:3.0.5.RELEASE]
    at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:197) ~[spring-batch-core-3.0.5.RELEASE.jar:3.0.5.RELEASE]
    at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:148) [spring-batch-core-3.0.5.RELEASE.jar:3.0.5.RELEASE]
    at org.springframework.batch.core.job.AbstractJob.handleStep(AbstractJob.java:392) [spring-batch-core-3.0.5.RELEASE.jar:3.0.5.RELEASE]
    at org.springframework.batch.core.job.SimpleJob.doExecute(SimpleJob.java:135) [spring-batch-core-3.0.5.RELEASE.jar:3.0.5.RELEASE]
    at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:306) [spring-batch-core-3.0.5.RELEASE.jar:3.0.5.RELEASE]
    at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:135) [spring-batch-core-3.0.5.RELEASE.jar:3.0.5.RELEASE]
    at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50) [spring-core-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:128) [spring-batch-core-3.0.5.RELEASE.jar:3.0.5.RELEASE]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_60]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_60]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_60]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_60]
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) [spring-aop-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) [spring-aop-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) [spring-aop-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.batch.core.configuration.annotation.SimpleBatchConfiguration$PassthruAdvice.invoke(SimpleBatchConfiguration.java:127) [spring-batch-core-3.0.5.RELEASE.jar:3.0.5.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) [spring-aop-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207) [spring-aop-4.1.6.RELEASE.jar:4.1.6.RELEASE]
    at com.sun.proxy.$Proxy33.run(Unknown Source) [na:na]

Answer 1

您的 StackTrace 的实际错误是:java.lang.IllegalStateException: No resources to read.

这意味着您的阅读器属性resource未设置或表达式与任何文件都不匹配。

这是一个示例配置:

<bean id="multiResourceReader" class="org.springframework.batch.item.file.MultiResourceItemReader">
    <property name="resources" value="file:folder/*.csv" />
    <property name="delegate" ref="delegate" />
</bean>

在此配置中，您可以看到 resource 属性已设置为 file:folder/*.csv。这意味着如果没有与此表达式匹配的文件，即文件夹中没有 CSV 文件，则会抛出异常。

所以您在这里要做的是检查您的 bean 配置并检查文件系统中是否存在实际文件。