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From Alberto Brosich <abros...@ogs.trieste.it>
Subject FTP consumer sometimes throws NullPointerException
Date Tue, 20 May 2014 08:38:01 GMT

Hi,
I have an exception from a ftp consumer only for few files. Camel
version is 2.13.1.

- It happens on few files (2 or 3). Remote directory contains many files
(many thousand)

- These few files have the same ownership and permissions of the others
and are not empty

- I stopped the application that create the files, to avoid any possible
lock (anyway, I can modify them without problems)

- I tried to copy and rename the files, removing the old one, (to create
a completely new one) without success

- Looking at the source code in
FtpChangedExclusiveReadLockStrategy.java, the error happens getting the
timestamp of the file:
for (FTPFile f : files) {
    if (f.getName().equals(file.getFileNameOnly())) {
        newLastModified = f.getTimestamp().getTimeInMillis();
        newLength = f.getSize();
    }
}

- Remote ftp server is IIS on windows 2000 server :o

- Nothing useful in the logs of the ftp server

Follow a trace log and the exception regarding one of those files:

2014-05-19 16:21:32,298 TRACE FtpChangedExclusiveReadLockStrategy -
Waiting for exclusive read lock to file:
RemoteFile[/dwrg1/moved/DWRG1_2014-03-30T01h30Z.xml]
2014-05-19 16:21:32,298 TRACE FtpChangedExclusiveReadLockStrategy -
Waiting for exclusive read lock to file:
RemoteFile[/dwrg1/moved/DWRG1_2014-03-30T01h30Z.xml]
2014-05-19 16:21:32,298 TRACE FtpChangedExclusiveReadLockStrategy -
Waiting for exclusive read lock to file:
RemoteFile[/dwrg1/moved/DWRG1_2014-03-30T01h30Z.xml]
2014-05-19 16:21:32,299 TRACE FtpChangedExclusiveReadLockStrategy -
Using fast exists to update file information for
RemoteFile[/dwrg1/moved/DWRG1_2014-03-30T01h30Z.xml]
2014-05-19 16:21:32,299 TRACE FtpChangedExclusiveReadLockStrategy -
Using fast exists to update file information for
RemoteFile[/dwrg1/moved/DWRG1_2014-03-30T01h30Z.xml]
2014-05-19 16:21:32,640 TRACE FtpChangedExclusiveReadLockStrategy - List
files /dwrg1/moved/DWRG1_2014-03-30T01h30Z.xml found 1 files
2014-05-19 16:21:32,640 TRACE FtpChangedExclusiveReadLockStrategy - List
files /dwrg1/moved/DWRG1_2014-03-30T01h30Z.xml found 1 files
2014-05-19 16:21:32,650 WARN  FtpConsumer -
Endpoint[ftp://xxxx@yy.yy.yy.yy//dwrg1/moved?delay=60000&disconnect=true&fastExistsCheck=true&idempotent=true&idempotentKey=%24%7Bfile%3Aname%7D-%24%7Bfile%3Amodified%7D-%24%7Bfile%3Asize%7D&idempotentRepository=%23fileStore&include=DWRG1.*%5C.xml&maxMessagesPerPoll=10&noop=true&password=xxxxxx&readLock=changed&sortBy=file%3Amodified]
cannot begin processing file: RemoteFile[/dwrg1/moved/DWRG1_2014-03-30T01h30Z.xml] due to:
null. Caused by: [java.lang.NullPointerException - null]
java.lang.NullPointerException
	at
org.apache.camel.component.file.remote.strategy.FtpChangedExclusiveReadLockStrategy.acquireExclusiveReadLock(FtpChangedExclusiveReadLockStrategy.java:83)
	at
org.apache.camel.component.file.strategy.GenericFileProcessStrategySupport.begin(GenericFileProcessStrategySupport.java:49)
	at
org.apache.camel.component.file.strategy.GenericFileRenameProcessStrategy.begin(GenericFileRenameProcessStrategy.java:35)
	at
org.apache.camel.component.file.GenericFileConsumer.processExchange(GenericFileConsumer.java:326)
	at
org.apache.camel.component.file.remote.RemoteFileConsumer.processExchange(RemoteFileConsumer.java:99)
	at
org.apache.camel.component.file.GenericFileConsumer.processBatch(GenericFileConsumer.java:201)
	at
org.apache.camel.component.file.GenericFileConsumer.poll(GenericFileConsumer.java:165)
	at
org.apache.camel.impl.ScheduledPollConsumer.doRun(ScheduledPollConsumer.java:187)
	at
org.apache.camel.impl.ScheduledPollConsumer.run(ScheduledPollConsumer.java:114)
	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:745)


Someone can explain what happens?

Regards

Alberto


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