IllegalStateException does not happen. Why not?

[Otto Teixeira]

Hello,

According to HFSJ, I should get an IllegalStateException if I redirect or dispatch the request after writing to the response. But that is not happening.

In any servlet's doPost():

response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("test");
out.flush();
response.sendRedirect("/anotherURL.jsp");

No exceptions occur. The sendRedirect statement is simply ignored.
If I remove the flush() line, then it gets redirect but still without the exception.

Thanks