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Posted to taglibs-user@tomcat.apache.org by Zack Chandler <za...@drainpatrol.com> on 2005/10/17 02:33:10 UTC
Type coersion question. Comparing char equality
Hi. Is there a way to not have the default type coercion (converts to Long)
happen when comparing chars. I simply want to test for char equality in a
JSP. See example below. Thanks.
// Controller code
char tChar = 't';
request.setAttribute("tChar", tChar);
// Now in JSP enter this fragment
<!-- JSP Frag -->
Prints t
${tChar}
Crashes
<c:if test="${tChar == 't'}">
inside
</c:if>
<!-- End Frag -->
It crashes with this error:
javax.servlet.jsp.el.ELException: An exception occured trying to convert
String
"t" to type "java.lang.Long"
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RE: Type coersion question. Comparing char equality
Posted by Zack Chandler <za...@drainpatrol.com>.
Thanks for the help on this. I really appreciate it.
-- Zack
-----Original Message-----
From: Rahul Akolkar [mailto:rahul.akolkar@gmail.com]
Sent: Sunday, October 16, 2005 5:51 PM
To: Tag Libraries Users List
Subject: Re: Type coersion question. Comparing char equality
On 10/16/05, Zack Chandler <za...@drainpatrol.com> wrote:
> Hi. Is there a way to not have the default type coercion (converts to
Long)
> happen when comparing chars. I simply want to test for char equality in a
> JSP. See example below. Thanks.
<snip/>
I now realize I should have suggested a solution in the comment to
your issue ticket in bugzilla.
EL has no notion of char, it only knows about "StringLiterals", which
is what 't' becomes in:
<c:if test="${tChar == 't'}">
If your immediate interest is evaluating this equality condition, I'd
use a String in the request.setAttribute, one that consists of one
character "tChar".
Let me know if you have other questions.
-Rahul
>
>
> // Controller code
> char tChar = 't';
> request.setAttribute("tChar", tChar);
>
> // Now in JSP enter this fragment
> <!-- JSP Frag -->
> Prints t
> ${tChar}
>
> Crashes
> <c:if test="${tChar == 't'}">
> inside
> </c:if>
> <!-- End Frag -->
>
> It crashes with this error:
>
> javax.servlet.jsp.el.ELException: An exception occured trying to convert
> String
> "t" to type "java.lang.Long"
>
>
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Re: Type coersion question. Comparing char equality
Posted by Rahul Akolkar <ra...@gmail.com>.
On 10/16/05, Zack Chandler <za...@drainpatrol.com> wrote:
> Hi. Is there a way to not have the default type coercion (converts to Long)
> happen when comparing chars. I simply want to test for char equality in a
> JSP. See example below. Thanks.
<snip/>
I now realize I should have suggested a solution in the comment to
your issue ticket in bugzilla.
EL has no notion of char, it only knows about "StringLiterals", which
is what 't' becomes in:
<c:if test="${tChar == 't'}">
If your immediate interest is evaluating this equality condition, I'd
use a String in the request.setAttribute, one that consists of one
character "tChar".
Let me know if you have other questions.
-Rahul
>
>
> // Controller code
> char tChar = 't';
> request.setAttribute("tChar", tChar);
>
> // Now in JSP enter this fragment
> <!-- JSP Frag -->
> Prints t
> ${tChar}
>
> Crashes
> <c:if test="${tChar == 't'}">
> inside
> </c:if>
> <!-- End Frag -->
>
> It crashes with this error:
>
> javax.servlet.jsp.el.ELException: An exception occured trying to convert
> String
> "t" to type "java.lang.Long"
>
>
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