_jspService methiod calarification

Code Source is scwcd study guide

why this out object is not available in _jspService. it is showing cnt resolve

Hi Vineet,

You can override the jspInit() and jspDestroy() methods in a jsp, but you can't override the _jspService() method.

JSP.11.1.1.1 Protocol Seen by the JSP Page Author
....
In JSP 2.0 this is done by defining methods with the names jspInit and jspDestroy in a
declaration scripting element in the JSP page. The jspInit method, if present, will
be called to prepare the page before the first request is delivered. Similarly a JSP
container can reclaim resources used by a JSP page when a request is not being
serviced by the JSP page by invoking its jspDestroy method, if present.
A JSP page author may not (re)define servlet methods through a declaration
scripting element.

Regards,
Frits

vineet walia wrote:
why this out object is not available in _jspService. it is showing cnt resolve

How do you know that, the problem with out implicit object?

eclipse is showing that error ....
for me it is showing only... cnt resolve this object

vineet walia wrote:eclipse is showing that error ....
for me it is showing only... cnt resolve this object

As Frits indicated, you can't override _jspService() method.

yes i go it

vineet walia wrote:yes i go it

So, is it the problem? Let's know it! Thanks!

You should not be overriding the _jspService method - The real problem.

Your problem is out is not declared. Why that happens is that when the JSP page is translated the JSP translator creates a _jspService method and then it starts initializing some of the implicit objects. One of the objects it instantiates is out.

Here is a snippet from the java file created by Tomcat 5.5

Have a look at line 10 and 22.

Darryl Smith is right! all the implicit objects are available with in service method of jsp. in other word, you can use implicit object only with <% %> and <%= %>.
and it is not possible with declaration(<%! %>)

As a side note: these scriptlets are obsolete.