Hi,

The out.print() does not rethrow IOException back to the caller JSP.  While the PrintWriter APIs do not throw any IOException, the JSPWriter (which is the type for the implicit "out") should throw the IOException.

Simple JSP to recreate the issue:

<%
    System.out.println("JSP start");
    try {
        for (int i=0 ; i<43490 ; i++) {
            out.print("xyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxyxy");
        }
        out.print("END_OF_DATA");
    }
    catch(java.io.IOException e) {
        System.out.println("caught a IOException !!!");
        e.printStackTrace(System.out);
        throw e;
    }
    System.out.println("JSP end");
 %>

While request to the JSP, immediately cancel the connection (by ctrl-C).  That will cause a broken pipe connection and result in the IOException.

The JSPWriterImpl's "out" is back by the ServletResponse.getWriter() which is the PrintWriter. 


private void initOut() throws IOException {
            if (out == null) {
                out = response.getWriter();
            }
}

So I think this PrintWriter has swallowed the IOException.

Thanks,