About the filtering feature

Hi,
The Filters section of the documentation says :
"After the original resource is invoked, control is passed back to the
filter at the bottom of the list in the chain. This filter can then
examine and modify the response headers and data, block the request,
throw an exception, or invoke the next filter up from the bottom of the
chain. This process continues in reverse order up through the chain of
filters."
The Servlet 2.3 specification doesn't mention the fact that the filter
chain is followed twice.
Did I miss something in the spec ?
Can anyone confirm the WLS behaviour ?
Thanks in advance.

In your filter, you invoke the doFilter method on the filter chain
which in turn invokes the next filter in the chain or the service
method of the servlet if there are no more filters. When the
method invoked by doFilter returns, doFilter itself returns and
control comes back to you. So we are not in fact traversing
the chain again, rather, this is a natural result of unwinding
the call stack.
mark
patrice thiebaud wrote:
Hi,
The Filters section of the documentation says :
"After the original resource is invoked, control is passed back to the
filter at the bottom of the list in the chain. This filter can then
examine and modify the response headers and data, block the request,
throw an exception, or invoke the next filter up from the bottom of the
chain. This process continues in reverse order up through the chain of
filters."
The Servlet 2.3 specification doesn't mention the fact that the filter
chain is followed twice.
Did I miss something in the spec ?
Can anyone confirm the WLS behaviour ?
Thanks in advance.

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