Java Reference
In-Depth Information
The
page
Object
The
page
object is just as it sounds, a reference to the current instance of the JSP. It is initial-
ized to the actual
this
reference by the generated servlet. The actual code snippet that does
this follows:
Object page = this;
You use the
page
object just as you would a
this
object, to reference the current instance of
your generated servlet.
The
exception
Object
The implicit
exception
object only exists in a defined
errorPage
. It holds a reference to the
uncaught exception that caused the error page to be invoked. You can find a complete descrip-
tion of the
errorPage
mechanism, including use of the implicit
exception
object in Chapter
18, “Handling JSP Errors.”
Summary
In this chapter we covered the JSP implicit objects and how they are commonly used. We also
talked about how these objects are created in the JSP's generated servlet. You should now have
a clear understanding of the implicit objects that are available to you and what they represent.
In the next chapter, we will cover using the JSP's standard actions.