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// TODO: Checking any one of {InterleavedResponse, ForwardUncommited} is relatively fast. But,
// checking both is very slow.
// According to the Servlet API, one should use
// - a writer for a textual response
// - a stream for a binary response, or for a mixed binary+textual response
// but never both a writer and a stream.
property InterleavedResponse
message "A ServletResponse was asked for both a writer and a stream."
prefix "ServletResponse"
nondet (start)
start -> start: *
start -> gotWriter: getWriter(R, IgnoreRet) => r := R
start -> gotStream: getOutputStream(R, IgnoreRet) => r := R
gotWriter -> error: getOutputStream(R, IgnoreRet) when R == r
gotStream -> error: getWriter(R, IgnoreRet) when R == r
property ForwardUncommitted
message "A ServletResponse was forwarded before being committed."
nondet (start)
start -> start: *
start -> gotChannel: "ServletResponse.\\(getWriter\\|getOutputStream\\)"(R, C) => r := R; c := C
gotChannel -> ok: "\\(PrintWriter\\|ServletOutputStream\\).flush.*"(C, IgnoreRet) when C == c
gotChannel -> error: "RequestDispatcher.forward"(IgnoreDispatcher, IgnoreRequest, Response, IgnoreRet) when Response == r