Question

我有一个简短的两步Spring Batch作业，它使用严格模式下的StaxEventItemReader从xml休息服务调用中读取。我希望它在严格模式下，因为没有连接到其余服务的能力，没有理由继续。我想捕获异常并使用自定义消息优雅地退出，而不是使用堆栈跟踪。

我能够使用StepExecutionListener捕获异常，并使用afterStep（）方法检查失败（stepExecution.getFailureExceptions（）），但仍在输出堆栈跟踪。我收到了自定义消息（下面的STS输出中的13：05：32,981）以及堆栈跟踪。当我使用带有onError方法的ItemReaderListener时，没有调用onError方法，我猜测是因为它是初始化异常而不是读错误。

捕获无法初始化阅读器异常并从输出中抑制堆栈跟踪的最佳方法是什么？

SpringBatch Job：

＆＃13;

	<batch:job id="randomSends2NG">
		<batch:step id="getStations" next="generateAndSend">
			<batch:tasklet>
				<batch:chunk reader="getStationsFromNG_RestXML" 
							 processor="idExtractor"
							 writer="stationsWriter"
							 commit-interval="1">
				</batch:chunk>	
				<batch:listeners>
					<batch:listener ref="noStationsStopListener" />
				</batch:listeners>		
				
			</batch:tasklet>
		</batch:step>
		<batch:step id="generateAndSend">
			<batch:tasklet>
				<batch:chunk reader="readStationIdsList" 
							 processor="createRandomRequests"
							 writer="ngBroadcasterService"
							 commit-interval="400">
				</batch:chunk>			
			</batch:tasklet>
		</batch:step>
	</batch:job>

＆＃13;

带有堆栈跟踪的STS输出：

＆＃13;

13:05:30,479 [main] INFO  SimpleJobLauncher  - No TaskExecutor has been set, defaulting to synchronous executor.
13:05:30,776 [main] INFO  DepartmentSendCountsNoOpReader  - constructing stationSendCountsReader
LightYellow color:43
13:05:31,368 [main] INFO  ProcessStatisticsTasklet  - constructor...
13:05:31,525 [main] INFO  RequestsListReader  - constructing requestsListReader
13:05:31,588 [main] INFO  Jaxb2Marshaller  - Creating JAXBContext with classes to be bound [class com.pevco.pevcotubesystem.StationConfig]
13:05:31,886 [main] INFO  SimpleJobLauncher  - Job: [FlowJob: [name=randomSends2NG]] launched with the following parameters: [{hostNameOrIP=192.168.100.10:8383}]
13:05:31,902 [main] INFO  SimpleStepHandler  - Executing step: [getStations]
13:05:32,981 [main] ERROR AbstractStep  - Encountered an error executing step getStations in job randomSends2NG
org.springframework.batch.item.ItemStreamException: Failed to initialize the reader
	at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:147)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
	at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
	at com.sun.proxy.$Proxy8.open(Unknown Source)
	at org.springframework.batch.item.support.CompositeItemStream.open(CompositeItemStream.java:96)
	at org.springframework.batch.core.step.tasklet.TaskletStep.open(TaskletStep.java:310)
	at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:195)
	at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:148)
	at org.springframework.batch.core.job.flow.JobFlowExecutor.executeStep(JobFlowExecutor.java:64)
	at org.springframework.batch.core.job.flow.support.state.StepState.handle(StepState.java:67)
	at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:165)
	at org.springframework.batch.core.job.flow.support.SimpleFlow.start(SimpleFlow.java:144)
	at org.springframework.batch.core.job.flow.FlowJob.doExecute(FlowJob.java:134)
	at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:304)
	at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:135)
	at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50)
	at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:128)
	at org.springframework.batch.core.launch.support.CommandLineJobRunner.start(CommandLineJobRunner.java:362)
	at org.springframework.batch.core.launch.support.CommandLineJobRunner.main(CommandLineJobRunner.java:590)
Caused by: java.lang.IllegalStateException: Input resource must exist (reader is in 'strict' mode)
	at org.springframework.batch.item.xml.StaxEventItemReader.doOpen(StaxEventItemReader.java:195)
	at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:144)
	... 27 more
13:05:32,981 [main] ERROR NoStationsStopListener  - Not able to get stations list from NG. Check that NG is running
13:05:32,998 [main] INFO  SimpleJobLauncher  - Job: [FlowJob: [name=randomSends2NG]] completed with the following parameters: [{hostNameOrIP=192.168.100.10:8383}] and the following status: [FAILED]
13:05:32,998 [main] INFO  ClassPathXmlApplicationContext  - Closing org.springframework.context.support.ClassPathXmlApplicationContext@4f4a7090: startup date [Wed Jul 01 13:05:29 EDT 2015]; root of context hierarchy

＆＃13;

Answer 1

当面临这个问题时，最好的解决方案可能是尽快检查REST服务，因为“无法连接到其他服务，没有理由继续[...]并正常退出使用自定义消息“。
在第一步之前，使用JobExecutionDecider检查REST可用性，并根据服务是否存在继续或结束工作。

捕获异常时抑制堆栈跟踪

1 个答案: