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From Gustavo Carvalho <gustavo_vilela_carva...@yahoo.com.br>
Subject Re: Links to relative URL's from a JSP
Date Tue, 25 Jul 2006 16:14:58 GMT
Maybe using 'getServletContext()' u can solve the problem.

Mike Molina <synod7@hotmail.com> escreveu: I'm beginning to see my problem is a bit
more complex than I had mentioned.

Here is the situtation: I have two JSP's, login.jsp and catalogue.jsp.  
Login JSP calls a servlet to do some processing. If it is successful, the 
servlet forwards the request and response objects to "/catalogue.jsp".

Whenever I access "catalogue.jsp" by entering in its absolute URL, 
everything works fine.  I can still have my relative img links to the images 
contained in the same folder, e.g., 

However, if "catalogue.jsp" is accessed by the servlet forwarding the 
request and response objects to "catalogue.jsp" then none of the usual 
relative URL's work.  In fact, the servlet will not even compile correctly:



SEVERE: Error loading WebappClassLoader
  delegate: false
  repositories:
    /WEB-INF/classes/
----------> Parent Classloader:
org.apache.catalina.loader.StandardClassLoader@17d5d2a
mm_lodging1.css
java.lang.ClassNotFoundException: catalogue.css
 at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1352)
[...]



This is only remedied if I use relative links to the images beginning with 
".." For example, if the image links are constructed like 
src="../image.jpg">.  Then the forwarding, runtime compilation of the 
servlet, and the image URL's in the document work fine.

To illustrate how this works, say I have 3 images, one of them with a 
"correct" relative URL location, and the other two using "../" before the 
image filename.  If I access the JSP using an absolute URL, one of the 
images will work, if I use dispatcher forwarding, 2 of them will work.

I am using Eclipse for development.

Sincerely,
Mike M.


>From: David Smith 
>Reply-To: "Tomcat Users List" 
>To: Tomcat Users List 
>Subject: Re: Links to relative URL's from a JSP
>Date: Mon, 24 Jul 2006 13:50:22 -0400
>
> > 2) JSP files, even though accessing image files in the same directory 
>must use the previous directory, e.g.,  even 
>though the images are contained in the same directory.
>
>What does the URL in your browser look like when you are access the JSP 
>pages?  The browser constructs the full path to the image from the URL used 
>to request the page (JSP or HTML -- the browser doesn't know the 
>difference).
>
> > My assumption is that JSP files are "rooted" in the WEB-INF directory 
>and so must use the previous directory notation back up a directory to 
>access the images contained the WebContent folder where everything else is.
>
>Nope.  They are "rooted" right where they are although internal forwarding 
>can make the request URL different from the actual location of the JSP.  In 
>the past, I've done stuff like 
>src="${pageContext.request.contextPath}/WebContent/image.jpg"> to get 
>around these issues with an absolute path to the image.  My example assumes 
>a servlet spec 2.4 webapp and container.
>
>--David
>
>Mike Molina wrote:
>
>>This thread is related to relative URL within JSP's and how they refer to 
>>the local directory structure in a web application.
>>
>>My directory structure in Tomcat goes something like this:
>>
>>webapps/inprogress/WebContent
>>(Accessed through Tomcat as such: 
>>http://127.0.0.1:8080/inprogres/WebContent
>>
>>where WebContent contains my JSP and HTML files, WEB-INF, etc.
>>
>>When creating img links to image files in the WebContent folder, I noticed
>>
>>1) HTML files can use the correct local pathname, e.g., 
>>src="imagname.jpg">
>>
>>however,
>>
>>2) JSP files, even though accessing image files in the same directory must 
>>use the previous directory, e.g.,  even though 
>>the images are contained in the same directory.
>>
>>My assumption is that JSP files are "rooted" in the WEB-INF directory and 
>>so must use the previous directory notation back up a directory to access 
>>the images contained the WebContent folder where everything else is.
>>
>>Thus, I have two questions:
>>
>>1) Why does this occur, and how can I modify my xml configuration files so 
>>that JSP's reference links exactly as an html file in the same directory 
>>would?
>>
>>2) How can I change the root folder of tomcat to the 
>>webapps/inprogress/WebContent directory, which xml files, and how exactly 
>>should I modify them?
>>
>>Thanks,
>>Mike M.
>>
>>
>>
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>
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