Flow of the Application with Interceptors

[Tarun Oohri]

Hi Everyone,
I am having a doubt in the flow with which the process goes.
Lets say my action in struts.xml is as follows

<action name="login" class="com.Login">
<interceptor-ref name="defaultStack"></interceptor-ref>
<interceptor-ref name="upper"></interceptor-ref>
<result>welcome.jsp</result>
</action>

Lets say this application allows you to enter your name from index.jsp and show it in the result.jsp

So, according to me, the param interceptor (which is inside the default-stack) will set my name in the ValueStack and then the "upper" interceptor will be invoked (which is a custom interceptor), from within this interceptor invoke() is called , which transfer the flow to the Action class (or next interceptor).

Action class returns a String "success". Now after executing the Action class the result string (ie. success) comes to the "upper" interceptor.
The "upper" interceptor will execute the statements given after the invoke() & then the intercept method will finish executing and return a String "success".

Now the flow comes to default-stack & the remaining statements are executed and it returns the String "success".

As, both the interceptors have been executed & the return is a "success".
Now, the flow goes to the <result> tag & the result name is matched and the flow is rendered to the result.jsp.

Am i right ??
Is the following flow right ?

default-interceptor-->upper-->ACTION-->upper-->default-interceptor-->welcome.jsp

Thanks in Advance !!!

[Joe Ess]

Tarun Oohri wrote:
default-interceptor-->upper-->ACTION-->upper-->default-interceptor-->welcome.jsp

The flow actually goes from your action to the JSP, then back up through the interceptor stack in reverse order. See here.
The "default-interceptor" is not a single interceptor, but several: see here.

[Tarun Oohri]

Joe Ess wrote:

Tarun Oohri wrote:
default-interceptor-->upper-->ACTION-->upper-->default-interceptor-->welcome.jsp

The flow actually goes from your action to the JSP, then back up through the interceptor stack in reverse order. See here.
The "default-interceptor" is not a single interceptor, but several: see here.

Thank you Joe ... I understood it now