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Posted to users@tomcat.apache.org by Mufaddal Khumri <mu...@wmotion.com> on 2003/10/10 05:04:57 UTC

2 Questions ..

Hi,

Am running my webapp under tomcat 4.1.18. Everything was fine till  
yesterday. I am facing this issue today. I wrote a new taglib -  
nextPrevLink for a jsp page called PotatoList.jsp.

<cw:nextPrevLink listSize='<%= getTotalNumberOfPotatoes()%>'
						 offset='<%=offset%>'
						 displaySize='<%=Constants.POTATO_LIST_DISPLAY_SIZE%>'
						 link='someLink'/>

Now when i change the value of the Constants.POTATO_LIST_DISPLAY_SIZE  
in the Constants.java and "reload" my webapp thru the tomcat manager  
and go to PotatoList.jsp the taglib takes the old value of displaySize  
(I have a system.out.println("") .. inside the class that implements  
the taglib).

Now if i change the PotatoList.jsp and "save it again" ... tomcat  
recompiles PotatoList.jsp when it comes across it. This time the taglib  
nextPrevLink takes the correct new value of Constants.  
POTATO_LIST_DISPLAY_SIZE.

________________________________________________________________________ 
_________________
QUE 1. How do I have my taglib take the updated values without having  
to recompile my jsp pages ?
________________________________________________________________________ 
_________________

Also I do not know if this is related. But when tomcat recompiles the  
PotatoList.jsp page above it shows me these lines in the log file:

ParserUtils: warning org.xml.sax.SAXParseException: URI was not  
reported to parser for entity [document]
ParserUtils: warning org.xml.sax.SAXParseException: No base URI; hope  
URI is absolute: http://java.sun.com/dtd/web-app_2_3.dtd
ParserUtils: warning org.xml.sax.SAXParseException: No base URI; hope  
this SYSTEM id is absolute: http://java.sun.com/dtd/web-app_2_3.dtd
ParserUtils: warning org.xml.sax.SAXParseException: URI was not  
reported to parser for entity [dtd]
ParserUtils: warning org.xml.sax.SAXParseException: missing system ID,  
using http://java.sun.com/dtd/web-app_2_3.dtd
ParserUtils: warning org.xml.sax.SAXParseException: URI was not  
reported to parser for entity [document]
ParserUtils: warning org.xml.sax.SAXParseException: No base URI; hope  
URI is absolute: http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd
ParserUtils: warning org.xml.sax.SAXParseException: No base URI; hope  
this SYSTEM id is absolute:  
http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd
ParserUtils: warning org.xml.sax.SAXParseException: URI was not  
reported to parser for entity [dtd]
ParserUtils: warning org.xml.sax.SAXParseException: missing system ID,  
using http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd

________________________________________________________________________ 
_________________
QUE 2. Why does this happen and how do I resolve this?
________________________________________________________________________ 
_________________

Thanks in advance,


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Re: 2 Questions ..

Posted by Tim Funk <fu...@joedog.org>.
Its probably the java compiler. If your constant is declared final, the 
compiler may be performing an optimization and taking the value insteadof a 
run-time reference. You can get around this by not using a constant and using 
a get method.

-Tim

Mufaddal Khumri wrote:

> Hi,
> 
> Am running my webapp under tomcat 4.1.18. Everything was fine till  
> yesterday. I am facing this issue today. I wrote a new taglib -  
> nextPrevLink for a jsp page called PotatoList.jsp.
> 
> <cw:nextPrevLink listSize='<%= getTotalNumberOfPotatoes()%>'
>                          offset='<%=offset%>'
>                          
> displaySize='<%=Constants.POTATO_LIST_DISPLAY_SIZE%>'
>                          link='someLink'/>
> 
> Now when i change the value of the Constants.POTATO_LIST_DISPLAY_SIZE  
> in the Constants.java and "reload" my webapp thru the tomcat manager  
> and go to PotatoList.jsp the taglib takes the old value of displaySize  
> (I have a system.out.println("") .. inside the class that implements  
> the taglib).
> 
> Now if i change the PotatoList.jsp and "save it again" ... tomcat  
> recompiles PotatoList.jsp when it comes across it. This time the taglib  
> nextPrevLink takes the correct new value of Constants.  
> POTATO_LIST_DISPLAY_SIZE.
> 



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