It depends on how you structure the utility classes. For every request, if
you are creating a new instance of the utility class, you don't have to
synchronize it. But if you are using a singleton utility object (Shared
across requests), then you need to.
e.g
Case 1
-------
public class Utility {
String attrA;
String attrB;
int methodA() {};
int methodB(){};
}
In your servlet1 (DoGet or DoPost)/JSPPage1 code,
Utility aUtility = new Utility();
aUtility.methodA();
In your servlet2/JSPPage2 code,
Utility aUtility = new Utility();
aUtility.methodA();
Case 2 Singleton Object
-------
public class Utility {
String attrA;
String attrB;
private Utility() {
}
private Utility a_Utility = null;
static private a_Utility = null;
static Synchronized public Utility instance() {
if (a_Utility == null ) a_Utility = new Utility();
return a_Utility;
}
..
synchronized static int aMethodA() {
..
}
}
In your servlet1/JSPPage1 code,
Utility.instance().methodA();
In your servlet2/JSPPage2 code,
Utility.instance().methodA();
Sree
>From: Marc Krisjanous <[EMAIL PROTECTED]>
>Reply-To: "A mailing list for discussion about Sun Microsystem's Java
> Servlet API Technology." <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: synchronized calls to utility classes??
>Date: Sun, 4 Jun 2000 16:37:36 -0500
>
>Hi all,
>Sorry to post this message again but I did not get any replies.....
>I have a servlet that creates utility classes for certain requests. The
>utility classes have instance variables. Do I need to synchronized the
>instantiation and method calls from the servlet to the utility classes?
>The
>utility classes manipulate data sent from client in request object.
>
>Cheers
>
>Marc
>
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