Is tld file necessary?

Question

Dear dudes,
I was working with JSTL , in which i'm using pre-defined tag libraries which contains many functionalities which is defined in TLD files. For example:
*<%@ taglib uri="WEB-INF/tld/struts-html" prefix="html" %>*Here this means i can use the html tags functionality which is defined in the uri i.e. tld files which defines the class and functionality.
here if i use some X() functionality in html tags, the container goes through the tld files and finds the corresponding method or function.
Why this should be like this?
<%@ taglib uri="WEB-INF\*lib\struts.jar*" prefix="html" %>
Why can't i directly refer the location of resource ( here the jar file) to the container so that these intermediate tld file mapping can be skipped.
Why is the tld file significant?
Any valid reply would be appreciated.
regards.

Answer 1

nammathamizhan wrote:
Dear dudes,
I was working with JSTL , in which i'm using pre-defined tag libraries which contains many functionalities which is defined in TLD files. For example:
*<%@ taglib uri="WEB-INF/tld/struts-html" prefix="html" %>*Here this means i can use the html tags functionality which is defined in the uri i.e. tld files which defines the class and functionality.
here if i use some X() functionality in html tags, the container goes through the tld files and finds the corresponding method or function.
Why this should be like this?
<%@ taglib uri="WEB-INF\*lib\struts.jar*" prefix="html" %>
Why can't i directly refer the location of resource ( here the jar file) to the container so that these intermediate tld file mapping can be skipped.
Why is the tld file significant?
Any valid reply would be appreciated.
regards.If i understand your question clearly, you mean to ask why not declare the <%@ taglib uri....%> in the .jsp file rather than the web.xml file right?
The simple reason for this is that we delcare the .jar files in the lib folder, which we reference in the web.xml file. The container reads the web.xml file first before reading your .jsp files. So if the mapping is not mentioned in the web.xml file you get an error. This is the working of the container, every mapping, filter, custom tag et all should be mentioned in the web.xml file(also called a deployment descriptor file). Read more about the deployment descriptor or web.xml in the docs.