After installing RPS3 (Recommended patch set) for Oracle EBS 12.1.3 (Patch number 20203366) , some JSP files no longer can be accessed from browser.
We are talking mostly about custom JSP files.
After logs investigation I found the following error
JspServlet: unable to dispatch to requested page: Exception:java.lang.IllegalStateException: Writer already retrieved
I opened the JSP file and found that there is a code :
I suspected that it may be the root cause of the problem. So instead of using response.getWriter() I just used out variable that you get for “free” in JSP.
I mean instead of:
Recompile the JSP, restart adoacore.ctl and the problem is gone