Given that Tomcat is the reference implementation I would assume its
implementation is the correct one.
cheesr
dim
On Tue, 24 Jul 2001 [EMAIL PROTECTED] wrote:
> Hi,
>
> I have notice a miss-implementation of the 'expression tag' ("<%= ...
> %>") between different JSP containers witch I want to share with you to
> clarify the standar vs. implementarion.
>
> The main issue is that an expression of type "<%= variable %> within a
> JSP page prints out different strings when 'variable' is 'null' ((variable
> == null) is true) ('variable' is of class 'String')
>
> Tomcat v3.2.1 prints out the string "null", while some other JSP containers
> (BEA Weblogic v6.0, HP Bluestone total-e-server v7.2) print out an empty
> string (nothing).
>
> However an expresion of type "<%= (variable1 + variable2) %>" prints out
> the same on every container (where both variables are 'String', and
> variable1 is NOT null and variable2 IS null)
>
> Does anyone have an opinion on what should be the correct behave for the
> expression-tag?. Is there any missunderstanding of the JSP
> specifications/standar?. Why the "<%= .. %>" tag behaves different on
> different
> containers (same jdk 1.3.0)?.
>
> I wonder what is the behave on other containers (iPlanet, Websphere,
> Tomcat 4, other..). Can anyone test it and give feedback?.
>
>
> Here is the code I've tested:
>
> ---- jsp ------
> <% String a = null;
> String b = "hello world"; %>
> <html><boby>
> 1 -<%=a%>-<p>
> 2 -<%=b%>-<p>
> 3 -<%=(b + a)%>-<p>
> </body></html>
> --------------
>
> Results:
>
> ----- TOMCAT -----
> 1 -null-
> 2 -hello world-
> 3 -hello worldnull-
> ----- TOMCAT -----
>
> ----- BEA & BLUESTONE -----
> 1 --
> 2 -hello world-
> 3 -hello worldnull-
> ----- BEA & BLUESTONE -----
> Notice line 1 is different while 2 & 3 are equal.
>
> Best regards
> Bob.
>
