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From David Smith <d...@cornell.edu>
Subject Re: Links to relative URL's from a JSP
Date Mon, 24 Jul 2006 20:30:54 GMT
> 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) 
>
> [...] 


There must be something very strange with your code if a css file is 
being interpretted as a class or resource on the classpath.  How are you 
calling it?  It should be in a standard link tag in the head of your jsp 
page as in <link type="text/css" src="<%= request.getContextPath() 
%>/stylesheets/catalogue.css"> or <link type="text/css" 
src="${pageContext.request.contextPath}/stylesheets/catalogue.css"/>

--David


Mike Molina wrote:

> 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., <img src="image.jpg">
>
> 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 <img 
> 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 <dns4@cornell.edu>
>> Reply-To: "Tomcat Users List" <users@tomcat.apache.org>
>> To: Tomcat Users List <users@tomcat.apache.org>
>> 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., <img 
>> src="../imagename.jpg"> 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 <img 
>> 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., <img 
>>> src="imagname.jpg">
>>>
>>> however,
>>>
>>> 2) JSP files, even though accessing image files in the same 
>>> directory must use the previous directory, e.g., <img 
>>> src="../imagename.jpg"> 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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>
>
>
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