So know that I have two responses, one being to pass the object to other
methods and one being to use a syncronized block.
Lets start a discussion as to which is better?
Christopher T. Beers Systems Analyst Administrator I
Office of Information Technology - Boston University
111 Cummington Street (617)353-8248
Boston, MA 02215 (617)353-6260 fax
On Tue, 20 Jul 1999, Claude Zervas wrote:
> At 06:02 PM 7/20/99 +0200, you wrote:
> >
> >Hi Christopher,
> >On Tue, 20 Jul 1999, Christopher T. Beers wrote:
> >CTB| I appreciate everyone help in this matter yesterday. The porblem
> >CTB| was the scope of my doPost() method. Outside of the method I declare
> >CTB|
> >CTB| private Hashtable table = new Hashtable();
> >
> >You should never do this, because the doPost(), doGet() or
> >service()-Method could be called from several threads _in parallel_ which
> >means that your parameters could get munged if two peope connect to your
> >servlet. You've to make sure that your methods are reentrant.
> >
> >In order to get this save, initialize your Hashtable in the processing
> >method:
> >
> > public void doPost (...) {
> > Hashtable table = new Hashtable();
> > .. do stuff
> > }
> >
> >If you need these parameters in other methods in your servlet (which is
> >what I assume you want do), you've to pass the table as parameter .. no
> >way around it ..
>
> Yes there is, just put the usage in a synchronized block:
>
> synchronized ( table ) {
> ....
> table.put( obj );
> ...
> }
>
> - Claude
>
>
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