Prentice Hall and Sun Microsystems. Personal use only; do not redistribute.
540
Appendix A
Servlet and JSP Quick Reference
  application 
Means that, in addition to being bound to a local variable, bean will be 
stored in shared 
ServletContext
 available through predefined 
application
 variable or by a call to 
getServletContext()
. 
  session 
Means that, in addition to being bound to a local variable, bean will be 
stored in 
HttpSession
 object associated with current request, where it 
can be retrieved with 
getValue
. 
  request 
Signifies that, in addition to being bound to a local variable, bean object 
should be placed in 
ServletRequest
 object for duration of current 
request, where it is available by means of the 
getAttribute
 method. 
Conditional Bean Creation
  A 
jsp:useBean
 element results in a new bean being instantiated only if 
no bean with the same 
id
 and 
scope
 can be found. If a bean with the 
same 
id
 and 
scope
 is found, the preexisting bean is simply bound to the 
variable referenced by 
id
.
  You can make 
jsp:setProperty
 statements conditional on new bean 
creation:
statements
A.14 Creating Custom JSP Tag Libraries
The Tag Handler Class
  Implement 
Tag
 interface by extending 
TagSupport
 (no tag body or tag 
body included verbatim) or 
BodyTagSupport
 (tag body is 
manipulated).
doStartTag
: code to run at beginning of tag
doEndTag
: code to run at end of tag
doAfterBody
: code to process tag body
Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.
Servlet and JSP training courses by book's author: courses.coreservlets.com.






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