It can become difficult to debug with the various .xml 
files that Struts relies on. If you have a setting out of 
wack, it's not very descriptive on how to fix it or what 
the issue is.

* Figuring out what all the .xml attributes and tags is 
another issue. Get a GUI plug-in for Eclipse or whatever 
IDE you use. They are very useful when learning the Struts 
ropes or setting up something such as Validator.

* Using the custom JSP tags, especially iterate, can be 
slightly confusing. Same thing with the link tag. There are 
scenarios that often come up where you say "I know if I 
just used a scriptlet, I could get this to work in 
seconds!" So the difficultly comes when you ask "how do I 
do this using Struts tags?"

major disadvantage is  we cannot write java code in jsp page.

we can write jsp code but managing of .xml file 
is very difficult

struts is flexible control layer based on the technlogies 
like servlets,jsp xml but we can say the main disadvantage 
using struts is it support WebApplications only more over 
it can't applicable for standalone application this can 
resolved in Sping FRAME work

yes, suryaprakesh is right.i aggree with you

the main disadvantage is we can't come back to the 
application.(in reverse order)

the main disadvantage is we can't come back to the 
application.(in reverse order)