Integration of 3rd party servlet filters problematic
----------------------------------------------------
Key: SLING-1003
URL: https://issues.apache.org/jira/browse/SLING-1003
Project: Sling
Issue Type: Bug
Components: Engine
Affects Versions: Engine 2.0.4
Environment: Windows Vista,
java version "1.6.0_13"
Java(TM) SE Runtime Environment (build 1.6.0_13-b03)
Java HotSpot(TM) Client VM (build 11.3-b02, mixed mode, sharing)
Reporter: Christian Sprecher
Priority: Minor
There is a problem within the chain handling: the 3rd party filter uses it's
own wrapper for requests and response, and supplies it to the chain in the
chain.doFilter() call. This leads to a ClassCastException on line 54 of
AbstractSlingFilterChain:
...
RequestProgressTracker tracker = ((SlingHttpServletRequest)
request).getRequestProgressTracker();
...
I am not sure if this cast is valid in the context of a filter chain. On the
other hand I am not sure wether such a use case (filter that manipulates
request and response) has a chance to run in Sling.
==> Please note that this servlet filter needs to run as early as possible in
the filter chain
java.lang.ClassCastException: org.webcastellum.RequestWrapper cannot be cast to
org.apache.sling.api.SlingHttpServletRequest
at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter
(AbstractSlingFilterChain.java:54)
at org.webcastellum.WebCastellumFilter.internalDoFilter(WebCastellumFilt
er.java:2610)
at org.webcastellum.WebCastellumFilter.doFilter(WebCastellumFilter.java:
1710)
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