how to modify a file in my jar(VFS)

[sh1theng]

jar --

      |---------com--

                       |----------seq

how to modify the file seq in jar?

I can get the file,but it is a virtual file.

I want to modify the file in jar,not the temp file.

[sfcoy]

What exactly are you trying to do?

Perhaps there is a better way...

[sh1theng]

I want to use a seq file to replace an oracle sequence.

I place the file in my EJB project,read it and increase it.

[nickarls]

Can't you just stick the value in a property file in the deployment?

[sh1theng]

what is property file?

oracle sequence.nextval only can get the one value,I want get more,sometimes 10,sometimes 100

So I use a file to record the value,I get 10,I icrease 10,

If i can not icrease the value ,I would get a repeat value when I restart the Jboss.

For convenience,I put it in my EJB project,when I move the server,I just need to move the jar.

[nickarls]

Umm. Why don't you just bypass the sequence altogether (since you're not really using it as a sequence)?. Store the last used value in a table row and use some "for update" to handle concurrency. Reading and writing a physcial file doesn't feel that robust.

[sh1theng]

that is the way i am using now.

select .... for update and then update it.

but sometimes it stuck.Looks like a deadlock,after 5000ms jboss throw a timeout Exception.

Maybe there some conflict with lock escalation

[nickarls]

Show the entire stack trace if available. In any case, I would say that is the path to follow instead of fiddling with files.

[sh1theng]

I try to use synchronized,and it didnot happen since now.