Hi, I am a little curious what you mean about the <%! tag. I am currently
using it and want to make sure I am not using it incorrectly. In what cases
would it be a problem. I am now using it to declare my variables, so are
you saying that if 1 user loads a jsp and the variable declared is set to
something if another user loads the page he can change user1's variable? Im
a little confused.
- Frank
----- Original Message -----
From: Hans Bergsten <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, May 15, 2000 2:51 PM
> "Wasetis, Ken" wrote:
> >
> > Or define it within <%! and %> tags which should make it an instance
> > variable in the generated servlet.
>
> That's a dangerous solution; since <%! ... %> creates an instance
variable,
> the variable is shared by all threads (i.e. all concurrent accesses to the
> page). In this case the variable value depends on request data, so if you
> use an instance variable concurrent requests will overwrite each others
> values.
>
> A better solution here would be to develop a bean that has a write
> access property named "selComputers" (set from the request parameter
> with the same name using <jsp:setProperty>) and read-only properties
> named "computerName" and "computerDescription". Then all code can be
> replaced with action elements:
>
> <jsp:useBean id="compInfo" class="com.mycomp.SomeClass" >
> <jsp:setProperty name="compInfo" property="*" />
> </jsp:useBean>
>
> <jsp:getProperty name="compInfo" property="computerName" />
> <jsp:getProperty name="compInfo" property="computerDescription" />
>
> Hans
>
> > -----Original Message-----
> > From: Vin Lisciandro [mailto:[EMAIL PROTECTED]]
> > Sent: Monday, May 15, 2000 12:28 PM
> > To: [EMAIL PROTECTED]
> > Subject:
> >
> > The compiler is not able to determine that 'myComputerName' will exist
> > because you only instantiate it inside of an IF statement
> >
> > you should do a:
> > String myComputerName = new String();
> > outside of your IF so that the object is brought into scope, then
> > just perform a value assignment inside the IF
> > myComputerName = myComputer.getComputerName();
> >
> > That way there will always be a 'myComputerName' object to satisfy the
> > compiler.
> >
> > - vin
> >
> > At 10:02 AM 5/15/00 -0700, you wrote:
> > >Ok. So in my JSP I call on a servlet that returns data to me via a
> > >"Computer" object which has name and description properties, but I
can't
> > >seem to get to those properties once I'm back in my JSP. The jsp code
is
> > >this:
> > ><%
> > > if (request.getParameter("selComputers") != null) {
> > > String getComputer =
request.getParameter("selComputers");
> > > net.authentix.applicationdefs.Computer myComputer =
> > >clsGetComputers.compGetAComputer(getComputer);
> > > String myComputerName = myComputer.getComputerName();
> > > String myComputerDescription =
> > >myComputer.getComputerDescription();
> > > }
> > >%>
> > >
> > >It is called in a file that get's included only if
> > >request.getParameter("selComputers") exists.
> > >But, if later in the same jsp I reference <%=myComputerName%> I receive
> > this
> > >error
> > >
> > >
> > >
> > >
> > >
> >
>d:\InetPub\ServletExec\ISAPI\Servlets\pagecompile\_AprilRelease\_AdminFunct
> > i
> > >ons\_System\_Services\_console_xjsp.java:189: Undefined variable:
> > >myComputerName
> > > out.print( String.valueOf( myComputerName ) );
> > > ^
> > >Is this a common or obvious error? It has me quite stumped.
Admittedly I
> > >am a COM/VB dll web programmer trying to learn jsp but I just want to
> > access
> > >the properties of my object. Is this possible in my jsp?
> > >I wouldn't ask but I've been trying for a couple days now and cannot
get
> > >there.
> > >Thanks.
> > >Jt.
>
> --
> Hans Bergsten [EMAIL PROTECTED]
> Gefion Software http://www.gefionsoftware.com
>
>
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