Spring Batch Integration, Email to be sent out in case of JobInstanceAlreadyCompleteException - spring-batch

Question

I would like to put a hook somewhere in the following code/config to be able to spot a JobInstanceAlreadyCompleteException and then email the production support team that this occurred.
I have tried a JobExecutionListener#beforeJob() method in Spring Batch, but the JobInstanceAlreadyCompleteException is occurring before job execution.
I am using this Spring Batch Integration configuration from the documentation:
<int:channel id="inboundFileChannel"/>
<int:channel id="outboundJobRequestChannel"/>
<int:channel id="jobLaunchReplyChannel"/>
<int-file:inbound-channel-adapter id="filePoller"
channel="inboundFileChannel"
directory="file:/tmp/myfiles/"
filename-pattern="*.csv">
<int:poller fixed-rate="1000"/>
</int-file:inbound-channel-adapter>
<int:transformer input-channel="inboundFileChannel"
output-channel="outboundJobRequestChannel">
<bean class="io.spring.sbi.FileMessageToJobRequest">
<property name="job" ref="personJob"/>
<property name="fileParameterName" value="input.file.name"/>
</bean>
</int:transformer>
I want to handle JobInstanceAlreadyCompleteException in case the same CSV file name appears as the job parameter. Do I extend org.springframework.integration.handler.LoggingHandler?
I notice that class is reporting the error:
ERROR org.springframework.integration.handler.LoggingHandler - org.springframework.messaging.MessageHandlingException: org.springframework.batch.core.repository.JobInstanceAlreadyCompleteException: A job instance already exists and is complete for parameters={input.file.name=C:\Users\csv\file2015.csv}. If you want to run this job again, change the parameters.

Answer 1

The ERROR org.springframework.integration.handler.LoggingHandler is done from the default errorChannel which is reached from the <poller> on your <int-file:inbound-channel-adapter>.
So, to handle it manually your just need to specify your own error-channel there a go ahead with email sending:
<int-file:inbound-channel-adapter>
<int:poller fixed-rate="1000" error-channel="sendErrorToEmailChannel"/>
</int-file:inbound-channel-adapter>
<int-mail:outbound-channel-adapter id="sendErrorToEmailChannel"/>
Of course, you will have to do some ErrorMessage transformation before sending ti over e-mail, but that is already details of the target business logic implementation.