The custom tag library
provides a mechanism by using which the
programmer can encapsulate recurring code or tasks and reuse them in
multiple applications
Custom tags like XML and HTML tags contain the start and end tags
and a body
A custom tag usage can be
specified using the taglib directive
Custom tags can be categorized as
Simple tags
Tags with attributes or
nested tags
The tag handler and TLD files are created to implement the
functionality of custom tags in a JSP file
Methods in tagHandler
doStartTag()
doEndTag()
release()
Tag library definition (TLD) file is an XML file ) that contains the
tag library description and consists of the folloing tags
taglib
tlibversion
jspversion
info
name
tagclass
bodycontent
The errors in JSP can be
categorized as either time errors or request time errors The error page
is a separate file that is used to trap runtime errors of a JSP Page
