camel ftp in recursive manner results in ftp error code: 226 - apache-camel

Question

I have a very simple ftp route that should recursively download files from an URL. It would be very important to get it running still today.
There are no proxies, no extra authentication, no firewall. However, it only downloads the first file and then the socket will be closed. I have experimented with the different timeouts but they did not solve the issue. Either error code 226 is retuned if I don't use any timeout or extra config option or if I use the commented out things, error code 221 is returned. The 226 does not seem to be an error as it just counts as an indication that the server completed the transfer. Stack traces I copied below. I would appreciate the responses and thanks also in advance.
The route I am using in pollEnrich as I have to start it depending on a timer.
The code:
[...]
from("direct:ftp").routeId("ftp")
.log("### FTP is in progress ")
.pollEnrich().simple(ConfigData.getConfigData().getFtpUrl()
+ "?binary=true&"
+ "recursive=true"
/* + "soTimeout=300000&"
+ "stepwise=true&"
+ "ignoreFileNotFoundOrPermissionError=true&"
+ "ftpClient.dataTimeout=30000&"
+ "disconnect=true&"
+ "consumer.delay=1000" */
)
.to("file:modelFiles")
.end();
[...]
Update 1
I removed pollEnrich() and without it it works fine. However, I cannot start it from another route e.g. from a timer. So this is a quick hack to get FTP running. I also copy the code here as I did it with an idempotent consumer, so that only those files will be downloaded that are not yet on the disk. It can maybe be useful also to other people. The idempotent consumer example you can find here (Apache Camel ftp consumer loads the same files again and again) for more information.
Any further comments?
from(ConfigData.getConfigData().getFtpUrl()
+ "?binary=true&"
+ "recursive=true&"
+ "passiveMode=true&"
+ "ftpClient.bufferSize=10000000&"
+ "localWorkDirectory=" + ConfigData.getConfigData().getLocalTmpDirectory())
.idempotentConsumer(header("CamelFileName"), FileIdempotentRepository.fileIdempotentRepository(new File("data", "repo.dat")))
.to("file:modelFiles")
.log("Downloaded file ${file:name} complete.")
.end();
Stack Trace
2016-03-19 15:27:53,921 [WARN|org.apache.camel.component.file.remote.FtpConsumer|MarkerIgnoringBase] Error processing file RemoteFile[2009-03-25/BioModels_Database-r13-sbml_files.tar.gz] due to File operation failed: null socket closed. Code: 221. Caused by: [org.apache.camel.component.file.GenericFileOperationFailedException - File operation failed: null socket closed. Code: 221]
org.apache.camel.component.file.GenericFileOperationFailedException: File **operation failed: null socket closed. Code: 221**
[...]
Caused by: java.net.SocketException: socket closed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
at sun.nio.cs.StreamDecoder.read(Unknown Source)
at java.io.InputStreamReader.read(Unknown Source)
at java.io.BufferedReader.fill(Unknown Source)
at java.io.BufferedReader.read(Unknown Source)
at org.apache.commons.net.io.CRLFLineReader.readLine(CRLFLineReader.java:58)
at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:314)
at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:294)
at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:483)
at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:608)
at org.apache.commons.net.ftp.FTP.cwd(FTP.java:828)
at org.apache.commons.net.ftp.FTPClient.changeWorkingDirectory(FTPClient.java:1128)
at org.apache.camel.component.file.remote.FtpOperations.doChangeDirectory(FtpOperations.java:769)
2016-03-19 12:42:16,068 [WARN|org.apache.camel.component.file.remote.FtpConsumer|MarkerIgnoringBase] Error processing file RemoteFile[2008-12-03/BioModels_Database-r12-sbml_files.tar.gz] due to File operation failed: null Socket Closed. Code: 226. Caused by: [org.apache.camel.component.file.GenericFileOperationFailedException - **File operation failed: null Socket Closed. Code: 226]**
[...]
Caused by: java.net.SocketException: Socket Closed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
at sun.nio.cs.StreamDecoder.read(Unknown Source)
at java.io.InputStreamReader.read(Unknown Source)
at java.io.BufferedReader.fill(Unknown Source)
at java.io.BufferedReader.read(Unknown Source)
at org.apache.commons.net.io.CRLFLineReader.readLine(CRLFLineReader.java:58)
at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:314)
at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:294)
at org.apache.commons.net.ftp.FTP.getReply(FTP.java:692)
at org.apache.commons.net.ftp.FTPClient.completePendingCommand(FTPClient.java:1813)
at org.apache.commons.net.ftp.FTPClient._retrieveFile(FTPClient.java:1885)
at org.apache.commons.net.ftp.FTPClient.retrieveFile(FTPClient.java:1845)
at org.apache.camel.component.file.remote.FtpOperations.retrieveFileToStreamInBody(FtpOperations.java:367)
Solution:
As added in Upadete 1, I do not use pollEnrich(). The route cannot be started from a timer now but it works. So I will close the question. I really like the idea of the idempotent consumer (unrelated to the original question).

Answer 1

Don't forget that a pollEnrich delete the oldExchange and keep the newExchange.
So you don't want to do a from("ftp").pollEnrich("timer") but a from("timer").pollEnrich("ftp").

Answer 2

See the Solution at the end of the question.