Question

File change listener in java

Asked by: hanoirules

Hi! is there a way in java to implement a file change listener without using TimerTask class?
Here is my problem: I have a web-app that has few config files. For one of them, we have the requirement that has to be reloaded at runtime.
Is there a way to do it without using a "TimerClassLike" class?
Thanks in advanced!

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Asked On
2007-03-08 at 02:45:13ID22435980
Tags

java

,

file

,

listener

,

change

Topics

Java Standard Edition

,

Programming Languages

,

Java Programming Language

Participating Experts
5
Points
500
Comments
35

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Answers

 

by: TimYatesPosted on 2007-03-08 at 02:53:09ID: 18677710

What's wrong with the TimerTask way?

Or a Thread?

 

by: hanoirulesPosted on 2007-03-08 at 04:27:24ID: 18678011

I was looking for smt different...Any others ideas?
Thanks anyway

 

by: CEHJPosted on 2007-03-08 at 11:23:19ID: 18681832

You could do it using kernel notifications, but that would require platform-specific JNI code

 

by: mayankeaglePosted on 2007-03-08 at 11:40:00ID: 18681995

Otherwise if you wanna do it using Java, you will end up using threads directly or indirectly. Here is an example: http://www.exampledepot.com/egs/javax.swing.text/LimitText.html

 

by: mayankeaglePosted on 2007-03-08 at 11:40:29ID: 18682000

Sorry the link was for a different Q ;-) this is the correct link:

http://geosoft.no/software/filemonitor/FileMonitor.java.html

Duh~! ;-)

 

by: TimYatesPosted on 2007-03-08 at 11:45:38ID: 18682042

That uses a Timer, yet the Q is how to do it without a Timer or Thread (for some unknown reason)

 

by: contactkarthiPosted on 2007-03-08 at 12:55:19ID: 18682682

 

by: hanoirulesPosted on 2007-03-09 at 02:05:58ID: 18686165

Hi! I' m really interested in trying jakarta's lib.. Do you know the link to download the jar?
Thanks to everybody!

 

by: CEHJPosted on 2007-03-09 at 02:13:25ID: 18686192

 

by: hanoirulesPosted on 2007-03-09 at 02:20:58ID: 18686219

Sorry for my ignorance: but there is no release available, as far as i saw  (http://jakarta.apache.org/commons/sandbox/jci/source-repository.html)

 

by: TimYatesPosted on 2007-03-09 at 02:23:18ID: 18686228

Of course, that still uses a Thread, but wraps it up away from you so you shouldn't have to worry about it ;-)

http://svn.apache.org/viewvc/jakarta/commons/sandbox/jci/trunk/fam/src/main/java/org/apache/commons/jci/monitor/FilesystemAlterationMonitor.java?view=markup

 

by: CEHJPosted on 2007-03-09 at 02:23:54ID: 18686234

Yep, it's downloadable by svn

 

by: hanoirulesPosted on 2007-03-09 at 02:27:00ID: 18686247

I found it! I'll let you know!

 

by: mayankeaglePosted on 2007-03-09 at 20:16:31ID: 18692498

>> That uses a Timer, yet the Q is how to do it without a Timer or Thread

Correct, which is why.... >> "you will end up using threads directly or indirectly" :-)

 

by: hanoirulesPosted on 2007-03-10 at 09:08:30ID: 18694429

Thanks to everybody!You are always full of ideas and a great help! :-))

 

by: TimYatesPosted on 2007-03-10 at 09:44:50ID: 18694510

>> Thanks to everybody!

But point to mayankeagle only...

;-)

 

by: hanoirulesPosted on 2007-03-10 at 09:47:05ID: 18694520

If you know a way to share it! I would give 500 point to anyone (but me!) on this site! :-)))))

 

by: TimYatesPosted on 2007-03-10 at 09:49:21ID: 18694526

There is a "split points" option when you come to accept an answer ;-)

 

by: hanoirulesPosted on 2007-03-10 at 09:52:38ID: 18694533

Hutch!I didn't know that! I'm ignorant even on "site-usage" :-((
Where is it? Do you know if i can correct my mistake?

 

by: TimYatesPosted on 2007-03-10 at 10:07:37ID: 18694566

I'll ask if this question can be reopened :-)

Don't worry about it :-)  I'm more glad you got your problem solved :-)

 

by: hanoirulesPosted on 2007-03-10 at 10:11:21ID: 18694573

I'll pay more attention next time, I promise!Let me know if have any news!

 

by: TimYatesPosted on 2007-03-10 at 10:25:18ID: 18694612

Hehehe, sorry if I sounded grumpy....I think I came across as grumpier than I was ;-)

I've posted a message asking the Admin for this area to pop along and reopen this question, and explain how to split the points (I'm not sure where it is now they redesigned the site) ;-)

As I said, glad you got it all sorted :-)

 

by: hanoirulesPosted on 2007-03-10 at 10:33:24ID: 18694638

no grumpy!! :-))) still friends then?

 

by: TimYatesPosted on 2007-03-10 at 10:35:07ID: 18694647

hahahaha... sure :-D

 

by: mayankeaglePosted on 2007-03-10 at 10:36:16ID: 18694650

Once it is reopened, click on the 'Accept Multiple Solutions' link instead of 'Accept Solution' and then you can split amongst the experts you want to.

 

by: hanoirulesPosted on 2007-03-10 at 10:41:06ID: 18694664

Thanks!

 

by: mayankeaglePosted on 2007-03-10 at 11:41:57ID: 18694896

No problem. I would never mind sharing my points with Tim and CEHJ ;-) because they helped too.

 

by: hanoirulesPosted on 2007-03-10 at 11:49:18ID: 18694921

Thanks, I would like to split points between all "helpers"; what i have to do? All answers were good answers..

 

by: CEHJPosted on 2007-03-10 at 12:16:45ID: 18695003

:-)

 

by: TimYatesPosted on 2007-03-10 at 12:28:20ID: 18695039

Thanks Venabili, and hanoirules!  I love it when there's a happy ending :-)

Good luck with it all, and thanks :-)

Tim

 

by: hanoirulesPosted on 2007-03-10 at 12:36:13ID: 18695063

:-)))))))

 

by: mayankeaglePosted on 2007-03-10 at 16:09:56ID: 18695698

>> Thanks Venabili, and hanoirules

And no thanks to me ;-) ?

 

by: cwitr329Posted on 2008-04-29 at 11:56:09ID: 21464990

Any java example which uses FileChangeListener

20120131-EE-VQP-002

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