Hey!
This doesn't surprise me. I recommend that you use a database.
They are designed to handle collisions like this.
Using file i/o is risky, i.e., you get data errors like yours. Worse
than that, depending on what operating system you are using, your
app. could get a very rude file locked error. I've seen these
file locked errors pile up until the whole system shuts down.
NT likes to put up error messages. What if 3000 more hits
come in while NT is doing this. Opps, Houston we have a
problem.
Use files for read only. Remember in servlets, everyone gets their
own thread of execution. Think about what that means as it applies
to your design and you will quickly realize that you can not use files
for persistent data.
Sans adieu,
Danny Rubis
Marcos wrote:
> hi,
>
> i have running a sevlets that reads from a file a number and it adds
>
> one more. after changes it saves.
> i want to use the same file from another servlet. any problem?? if
> both servlets try to open and save at the same time.
>
> file = 4455
>
> servlet 1 servlet2
> { {
> read from file 4455 read from file 4455
> ++ ++
> 4456 4456
> save save
> } }
>
> it is wrong. in file should be 4457.
>
> thanks in advance,
>
> marcos
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