Re: Class files for jsp

From: Harold Ensle (heensle_at_ix.netcom.com)
Date: 12/18/03 

Date: Wed, 17 Dec 2003 23:37:55 GMT

"Raymond DeCampo" <rdecampo@spam-I-am-not.twcny.rr.com> wrote in message
news:F3PDb.25798$JW3.7766@twister.nyroc.rr.com...
> Harold Ensle wrote:
> > "Raymond DeCampo" <rdecampo@spam-I-am-not.twcny.rr.com> wrote in message
> > news:VawCb.8206$JW3.1030@twister.nyroc.rr.com...
> >
> >>Harold Ensle wrote:
> >>
> >>>I am using Jserv on apache and I cannot instantiate from a class file
in
> >>>JSP.
> >>>I was using servlets before and any class I put in the same directory
> >
> > (or
> >
> >>>other directories indicated with a classpath in the Jservproperties
> >
> > file)
> >
> >>>would work fine. But JSP files (which are in a different directory)
> >
> > cannot
> >
> >>>seem to find my classes no matter where I put them...whether in a
> >
> > classpath
> >
> >>>or not. I even put them in the WEB_INF/classes folder and still
nothing.
> >>>I have searched everywhere for an answer. Does anyone know???
> >>>
> >>
> >>Harold,
> >>
> >>Perhaps you should post some sample code and describe the directory
> >>structure of your WAR. One question comes to mind however: did you
> >>import the desired classes with <@page import="" @> ?
> >>
> >>Ray
> >
> >
> > Thank you for the reply. This seems to be part of the problem. So I now
have
> > something
> > like:
> >
> > <%@ page import="ZClass"%>
> > <%
> > ZClass zc=new ZClass(1);
> > %>
> >
> > The class itself has:
> >
> > public class ZClass
> > {
> > ZClass(int x)
> > {
> > ......
> > }
> > }
> >
> > Now the JSP is acting like it finds the class (no error on the import)
> > but it is saying there is no constructor of the type to be found.
> > But I see a constructor there. What did I do wrong?
> >
> > (I think Java hates me.)
> >
>
> I would wager that the issue is that you didn't declare the constructor
> public, like so:
>
> public class ZClass
> {
> public ZClass(int x)
> {
> ......
> }
> }
>
> Java defines four access levels: public, protected, private and package
> or default. Package level is the default that is used when no access
> specifier is, well, specified. (IMHO, it would have been better to make
> an explicit keyword for package level and require one.) Public,
> protected and private behave as one would expect from other OO
> languages. Package level defines an access level within a package; any
> class within the same package can access the method, variable, etc.
> This provides functionality similar to C++ friends. Note that unless
> the package is sealed, nothing prevents others from creating classes in
> the same package and exploiting the access, if you care about that sort
> of thing.
>
> Another interesting thing is that the access levels in descending order
> are public, protected, package and private. That means that protected
> implies package. Which means that you cannot have methods, variables
> etc that are visible to the subclass but not to the other members of the
> package. (IMHO, I would have preferred public, package, protected and
> private; or even something not well-ordered where package and protected
> are unrelated.)
>
> Ray

Thanks. This was very informative. Using public worked. However, when
I used the class from a compiled servlet, it worked without "public" and
that
is why I didn't think it was needed. Apparently the compiler had public as
the default.

H.Ellis Ensle
>
>
>
>

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