For res.sendRedirect(), res.sendError(), and rd.forward, I am seeing inconsistent documentation with regards to if an
IllegalStateException will be thrown or not, if the calls have already been made and if we write more to the response.
For instance, the code
public void do Post(req,res)
{
PrintWriter out = res.getWriter(); // line 1
out.print(" hello "); // line 2
res.sendError(res.SC_NOT_FOUND); // line 3
out.print(); // line 4
}
Will out.print() at line 4 throw an IllegalStateException?
What is the behavior the same for forward() and sendRedirect().
The
servlet api has the following comments for sendError() - but this does not indicate if an exception will be thrown or not..It just mentions that the response should not be written to.
" If the response has already been committed, this method throws an IllegalStateException. After using this method, the response should be considered to be committed and should not be written to. "
I have seen totally inconsistent answers for this question in the different books/practice exams that I have read/taken. Could someone please clarify this.