Srikanth: Not sure if it helps, but what I do is start building the reply page in an object (I use HTML generator classes), and if an error occurrs I build a seperate reply page & display that rather than the original. If I get to the end of processing & no error, display the normal reply page. Kind of takes advantage of the page-at-a-time nature of HTML, but I'm not sure if it's applicable to your situation. It's basically option 2 on your list. Mike N. -----Original Message----- From: Srikanth Ranganathan [mailto:[EMAIL PROTECTED]] Sent: Thursday, April 29, 1999 12:15 PM To: [EMAIL PROTECTED] Subject: Re: An alternative to sendRedirect() orRequestDispatcher.forward() I am struggling with the same problem. I would like to clean out the print writer buffer, and substitute it with the contents of the error message. Does anybody have ideas as to deal with exceptions / error messages, when a partial response has been written into the printwriter out stream ? -Srikanth Neal Kaiser wrote: > I've realized one problem (and am still looking for a good solution). Let > me explain how a sample JSP flows: > > <Database Query is Done> > Things printed to PrintWriter > <Another Database Query is Done> > This printed > ...etc > > Now my <Database Query Done> tags can do a sendRedirect if there is an > error executing the SQL. > > So, say my first database query is done, then things are printed, then the > second query bombs. It will try to do a sendRedirect, which ofcourse won't > work because the servlet output stream has been written to. (Aside note, > this DID work with build 131 - but according to the spec, it probably > shouldn't have). > > As I see it, my options are to either: > > 1) Do all queries at the top of the JSP before any HTML is printed. The way > the JSPs are structured, this would not really be acceptable. > > 2) Somehow have my "out" PrintWriter really be a buffer. Then, when > everthing is done, print to the real output stream. I'm not sure how > possible this would be.... > > Any other ideas? > > Thanks. > > At 09:25 AM 4/29/99 -0400, you wrote: > >I am using the latest JRun build (140) and much of my JSP functionality is > >failing. In many of my JSPs, I do some preliminary processing of a > >request, and if certan conditions are met, I forward the request to another > >JSP for processing. > > > >I do all this BEFORE anything is written to the PrintWriter (Servlet > >OutputSteam). This previously worked w/ build 131, but now doesn't. I've > >tried the RequestDispatcher.forward() also, no luck. In reading the spec, > >it says "You cannot use this method if the PrintWriter object has been > >obtained from the response..." > > > >Well, when JRun compiles a JSP to a JAVA file, one fo the first lines in > >the service() method is: > > > >PrintWriter out = new PrintWriter (new BufferedWriter( new > >OutputStreamWriter(Response.getOutputStream())),true) > > > >How can I get around this? I want to be able to forward requests, but > >cannot because getOutputStream has been called. > > > >Thanks, > > > >Neal Kaiser > > > >------------------------------------------------------------ > >To unsubscribe, send email to [EMAIL PROTECTED] > >and include in the body of the message "unsubscribe jrun-development". > > > > > > ___________________________________________________________________________ > To unsubscribe, send email to [EMAIL PROTECTED] and include in the body > of the message "signoff SERVLET-INTEREST". > > Archives: http://archives.java.sun.com/archives/servlet-interest.html > Resources: http://java.sun.com/products/servlet/external-resources.html > LISTSERV Help: http://www.lsoft.com/manuals/user/user.html ___________________________________________________________________________ To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff SERVLET-INTEREST". Archives: http://archives.java.sun.com/archives/servlet-interest.html Resources: http://java.sun.com/products/servlet/external-resources.html LISTSERV Help: http://www.lsoft.com/manuals/user/user.html ___________________________________________________________________________ To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff SERVLET-INTEREST". Archives: http://archives.java.sun.com/archives/servlet-interest.html Resources: http://java.sun.com/products/servlet/external-resources.html LISTSERV Help: http://www.lsoft.com/manuals/user/user.html
