Remove file from remote using streaming inbound channel adapter spring boot implementation - spring

Question

I am trying to remove file from remote by implementing streaming inbound but connection is closing before adviceChain implementing.
CODE:
#Bean
public SessionFactory<LsEntry> sftpSessionFactory() {
DefaultSftpSessionFactory factory = new DefaultSftpSessionFactory(true);
factory.setHost(sftpHost);
factory.setPort(sftpPort);
factory.setUser(sftpUser);
factory.setPassword(sftpPwd);
factory.setAllowUnknownKeys(true);
return new CachingSessionFactory<LsEntry>(factory);
}
#Bean
#InboundChannelAdapter(channel = "stream", poller = #Poller(cron = "2 * * * * ?"))
public MessageSource<InputStream> sftpMessageSource() {
SftpStreamingMessageSource messageSource = new SftpStreamingMessageSource(template());
messageSource.setRemoteDirectory(remoteDirecotry);
messageSource.setFilter(new AcceptAllFileListFilter<>());
return messageSource;
}
#Bean
public SftpRemoteFileTemplate template() {
return new SftpRemoteFileTemplate(sftpSessionFactory());
}
#Bean
#Transformer(inputChannel = "stream", outputChannel = "data")
public org.springframework.integration.transformer.Transformer transformer() {
return new StreamTransformer("UTF-8");
}
#ServiceActivator(inputChannel = "data" ,adviceChain = "afterChain")
#Bean
public MessageHandler handler() {
return new MessageHandler() {
#Override
public void handleMessage(Message<?> message) throws MessagingException {
String fileName = message.getHeaders().get("file_remoteFile").toString();
if (!StringUtils.isEmpty(message.toString())) {
else{
log.info("No file found in the Remote location");
}
}
};
}
#Bean
public ExpressionEvaluatingRequestHandlerAdvice afterChain() {
ExpressionEvaluatingRequestHandlerAdvice advice = new ExpressionEvaluatingRequestHandlerAdvice();
advice.setOnSuccessExpression(
"#template.remove(headers['file_remoteDirectory'] + headers['file_remoteFile'])");
//advice.setOnSuccessExpressionString("#template.remove(headers['file_remoteFile'])");
advice.setPropagateEvaluationFailures(true);
return advice;
}
wherever i search every one is suggesting to implement ExpressionEvaluatingRequestHandlerAdvice but it is throwing me below error.
2018-03-27 12:32:02.618 INFO 23216 --- [ask-scheduler-1] o.s.b.c.l.support.SimpleJobLauncher : Job: [FlowJob: [name=starsBatchJob]] completed with the following parameters: [{JobID=1522168322277}] and the following status: [COMPLETED]
2018-03-27 12:32:02.618 INFO 23216 --- [ask-scheduler-1] c.f.u.config.ParentBatchConfiguration : Job Status Completed
2018-03-27 12:32:02.618 INFO 23216 --- [ask-scheduler-1] c.f.u.config.ParentBatchConfiguration : Total time tokk for Stars Batch execution: 0 seconds.
2018-03-27 12:32:02.618 INFO 23216 --- [ask-scheduler-1] c.f.u.config.ParentBatchConfiguration : Batch Job lock is released
2018-03-27 12:32:02.633 INFO 23216 --- [ask-scheduler-1] com.jcraft.jsch : Disconnecting from hpchd1e.hpc.ford.com port 22
2018-03-27 12:32:02.633 ERROR 23216 --- [ask-scheduler-1] o.s.integration.handler.LoggingHandler : org.springframework.messaging.MessagingException: Dispatcher failed to deliver Message; nested exception is org.springframework.messaging.MessagingException: Failed to execute on session; nested exception is org.springframework.core.NestedIOException: Failed to remove file: 2: No such file; nested exception is 2

Answer 1

I had this problem. My path to the remote file was incorrect. I needed a trailing /. It is a little difficult to see since the path is being created inside a Spel Expression. You can see the path using the following in the handleMessage() method.
String remoteDirectory = (String) message.getHeaders().get("file_remoteDirectory");
String remoteFile = (String) message.getHeaders().get("file_remoteFile");
I did have to use the advice.setOnSuccessExpressionString("#template.remove(headers['file_remoteFile'])"); that is commented out above instead of advice.setOnSuccessExpression"#template.remove(headers['file_remoteDirectory'] + headers['file_remoteFile'])");
It is incorrect in the documentation https://docs.spring.io/spring-integration/reference/html/sftp.html#sftp-streaming which is why I believe people who struggle with this lose faith in the doc. But this seems to be the only error.