[cdi-dev] [JBoss JIRA] (CDI-411) CDI conversation activation conflicts with the Servlet spec
Jozef Hartinger created CDI-411:
-----------------------------------
Summary: CDI conversation activation conflicts with the Servlet spec
Key: CDI-411
URL: https://issues.jboss.org/browse/CDI-411
Project: CDI Specification Issues
Issue Type: Bug
Components: Java EE integration
Affects Versions: 1.1.FD
Reporter: Jozef Hartinger
The Servlet specification says:
{quote}
If the client hasn't set character encoding and the request data is encoded with a
different encoding than the default as described above, breakage can occur. To
remedy this situation, a new method setCharacterEncoding(String enc) has been
added to the ServletRequest interface. Developers can override the character
encoding supplied by the container by calling this method. It must be called prior to
parsing any post data or reading any input from the request. Calling this method
once data has been read will not affect the encoding.
{quote}
The CDI specification says:
{quote}
The container provides a filter with the name "CDI Conversation Filter", which
may be mapped in web.xml, allowing the
user alter when the conversation is associated with the servlet request. If this filter is
not mapped in any web.xml in the
application, the conversation associated with a Servlet request is determined at the
beginning of the request before calling any
service() method of any servlet in the web application, calling the doFilter() method of
any servlet filter in the web
application and before the container calls any ServletRequestListener or AsyncListener in
the web application.
{quote}
and
{quote}
The long-running conversation associated with a request may be propagated to any Servlet
request via use of a request
parameter named cid containing the unique identifier of the conversation.
{quote}
This implies that in the default setup (CDI Conversation Filter not mapped), a CDI
implementation is required to determine the conversation at the beginning of the request.
That means that it has to read the "cid" parameter before any
listener/filter/servlet is invoked. Reading the "cid" parameter causes the
request body to be read. Therefore, if a listener/filter/servlet attempts to set the
request character encoding using the aforementioned setCharacterEncoding(String enc)
method, this never has any effect because a CDI implementation has already read the
request body using the default encoding.
This can be worked around by mapping the CDI Conversation Filter and adding a custom
encoding-setting filter before it. However, in the default configuration this issue often
causes confusion.
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