As has already been stated, JSPs go through a translation and compilation phase prior to processing their first request. This is illustrated in Figure 13.5.
The Web server automatically translates and compiles a JSP; you do not have to manually run any utility to do this. JSP translation and compilation can occur at any time prior to the JSP first being accessed. It is implementation dependent when this translation and compilation occurs but it is usually either
When the first request for the JSP is received
If the latter strategy is used, not only is there a delay in ...