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Web Component Certification (SCWCD/OCPJWCD)
implicit jsp objects
Joined: Feb 07, 2005
Dec 18, 2006 21:49:00
Implicit objects are not available inside jspInit() or jspDestroy() method.That means implicit objects are available in _jspService() method only.
is it so?
Joined: Nov 16, 2005
Dec 18, 2006 21:58:00
yes. Implicit objects are available only in _jspService() method. In JSP, you can access those in scriplets, expressions but not in declaration(because it goes out side _jspService method on converted servlet).
Prabhu Venkatachalam<br />SCJP 1.4,SCWCD 1.4<br />email@example.com
Joined: Dec 14, 2006
Dec 18, 2006 22:00:00
Hey we can access implicit object inside jspInit()/jspDestroy() method.
config implicit object.
Thanks and regards,
Joined: Oct 12, 2006
Dec 18, 2006 22:02:00
The implicit objects are the local variables inside the _jspService method. So jspInit() and jspDestroy() have no access to it.
Joined: Oct 17, 2006
Dec 19, 2006 06:15:00
Just to throw more light on this topic.
The _jspService() method is responsible for producing all the implicit objects (session, config, application, config etc). This is done at the very beginning of the _jspService() method.
An example of how the _jspService() method in a converted servlet looks like:
public void _jspService(
_jspxFactory = null;
pageContext = null;
session = null;
application = null;
config = null;
out = null;
Object page = this;
_jspx_out = null;
_jspx_page_context = null;
_jspxFactory = JspFactory.getDefaultFactory();
pageContext = _jspxFactory.getPageContext(this, request, response,
null, true, 8192, true);
_jspx_page_context = pageContext;
application = pageContext.getServletContext();
config = pageContext.getServletConfig();
session = pageContext.getSession();
out = pageContext.getOut();
_jspx_out = out;
Thus any scriptlet or expression is able to use these local implicit objects as they are initialized at the beginning of _jspService() only.
The statement that "Implicit objects cannot be used outside _jspService method" is very much true due to their local nature.
Stay connected, Remain beautiful
SCJP 1.4, SCWCD 1.4
Joined: Oct 16, 2005
Dec 19, 2006 10:11:00
well said abhijeet ! and i like your signature ...
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subject: implicit jsp objects
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