我正在尝试使用相当简单的路由通过 SFTP 将文件从远程服务器下载到本地目录。
我面临的问题是该路由能够下载小文件（200 字节），但对于较大的文件（200 KB），它恰好卡在 98265 字节。大约 30 秒后，我收到管道关闭错误。
我正在使用 Apache Camel 版本：2.15.3
来自：sftp://xxx.xxx.xxx.xxx:xx//User/User01?delay=30s&include=File.*.csv&initialDelay=1m&password=xxxxxx&stepwise=false&streamDownload=true&username=User01
收件人：file:///var/opt/myfolder/incoming?doneFileName=${file:name}.done
DEBUG 04/11/15 07:45:24,183 org.apache.camel.component.file.FileOperations :Using InputStream to write file: /var/opt/myfolder/incoming/File01.csv
...
few seconds gap
...
INFO 04/11/15 07:49:53,820 org.apache.camel.component.file.remote.SftpOperations$JSchLogger :JSCH -> Caught an exception, leaving main loop due to Connection reset
INFO 04/11/15 07:49:53,821 org.apache.camel.component.file.remote.SftpOperations$JSchLogger :JSCH -> Disconnecting from xxx.xxx.xxx.xxx port xx
WARN 04/11/15 07:49:53,823 org.apache.camel.util.IOHelper :Cannot close: File01.csv. Reason: Pipe closed
java.io.IOException: Pipe closed
at java.io.PipedInputStream.read(PipedInputStream.java:308)
at java.io.PipedInputStream.read(PipedInputStream.java:378)
at java.io.InputStream.skip(InputStream.java:222)
at com.jcraft.jsch.ChannelSftp.skip(ChannelSftp.java:2894)
at com.jcraft.jsch.ChannelSftp.access$600(ChannelSftp.java:36)
at com.jcraft.jsch.ChannelSftp$RequestQueue.cancel(ChannelSftp.java:1246)
at com.jcraft.jsch.ChannelSftp$2.close(ChannelSftp.java:1503)
at org.apache.camel.util.IOHelper.close(IOHelper.java:326)
at org.apache.camel.component.file.FileOperations.writeFileByStream(FileOperations.java:404)
at org.apache.camel.component.file.FileOperations.storeFile(FileOperations.java:274)
at org.apache.camel.component.file.GenericFileProducer.writeFile(GenericFileProducer.java:277)
at org.apache.camel.component.file.GenericFileProducer.processExchange(GenericFileProducer.java:165)
at org.apache.camel.component.file.GenericFileProducer.process(GenericFileProducer.java:79)
at org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61)
at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:129)
at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:77)
at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:448)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:118)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:80)
at org.apache.camel.processor.ChoiceProcessor.process(ChoiceProcessor.java:111)
at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:77)
at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:448)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:118)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:80)
at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:109)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:60)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:166)
at org.apache.camel.component.file.GenericFileConsumer.processExchange(GenericFileConsumer.java:435)
at org.apache.camel.component.file.remote.RemoteFileConsumer.processExchange(RemoteFileConsumer.java:137)
at org.apache.camel.component.file.GenericFileConsumer.processBatch(GenericFileConsumer.java:211)
at org.apache.camel.component.file.GenericFileConsumer.poll(GenericFileConsumer.java:175)
at org.apache.camel.impl.ScheduledPollConsumer.doRun(ScheduledPollConsumer.java:174)
at org.apache.camel.impl.ScheduledPollConsumer.run(ScheduledPollConsumer.java:101)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
出现此错误后，不会下载此文件和其余文件。我也尝试使用 localWorkDirectory 但看到下载到 tmp 目录中的文件也停留在 98265 字节。
+ 更新：
经过进一步调查，Apache Camel 内部使用的 JSCH 库似乎存在问题。等待时间后出现以下错误。我使用 JSCH 创建了一个用于下载的独立代码，该代码也挂在下载之间。我还使用另一个能够成功下载文件的 sftp api（不是 JSCH）创建了一个独立代码。
WARN 04/11/15 07:49:58,877 org.slf4j.helpers.MarkerIgnoringBase :Error processing file RemoteFile[/User/User01/File02.csv] due to Cannot retrieve file: /User/User01/File02.csv. Caused by: [org.apache.camel.component.file.GenericFileOperationFailedException - Cannot retrieve file: /User/User01/File02.csv]
org.apache.camel.component.file.GenericFileOperationFailedException: Cannot retrieve file: /User/User01/File02.csv
at org.apache.camel.component.file.remote.SftpOperations.retrieveFileToStreamInBody(SftpOperations.java:651)
at org.apache.camel.component.file.remote.SftpOperations.retrieveFile(SftpOperations.java:594)
at org.apache.camel.component.file.GenericFileConsumer.processExchange(GenericFileConsumer.java:396)
at org.apache.camel.component.file.remote.RemoteFileConsumer.processExchange(RemoteFileConsumer.java:137)
at org.apache.camel.component.file.GenericFileConsumer.processBatch(GenericFileConsumer.java:211)
at org.apache.camel.component.file.GenericFileConsumer.poll(GenericFileConsumer.java:175)
at org.apache.camel.impl.ScheduledPollConsumer.doRun(ScheduledPollConsumer.java:174)
at org.apache.camel.impl.ScheduledPollConsumer.run(ScheduledPollConsumer.java:101)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: 4:
at com.jcraft.jsch.ChannelSftp.get(ChannelSftp.java:1513)
at com.jcraft.jsch.ChannelSftp.get(ChannelSftp.java:1266)
at org.apache.camel.component.file.remote.SftpOperations.retrieveFileToStreamInBody(SftpOperations.java:636)
... 14 more
Caused by: java.io.IOException: Pipe closed
at java.io.PipedInputStream.read(PipedInputStream.java:308)
at com.jcraft.jsch.Channel$MyPipedInputStream.updateReadSide(Channel.java:362)
at com.jcraft.jsch.ChannelSftp.get(ChannelSftp.java:1287)
... 16 more
问题1：可能出了什么问题？如何解决这个问题？
问题 2：有没有办法将任何其他库与 Apache Camel 一起用于 SFTP？
任何建议，将不胜感激。
提前致谢。