Why do I get java.lang.IllegalStateException
? These are the most common reasons how you can get an
java.lang.IllegalStateException
:
- Calling
setBufferSize
and content has been written. - The response has been committed and you do any of the following:
- Calling
ServletResponse.reset()
or ServletResponse.resetBuffer()
- Calling either
HttpServletResponse.sendError()
or HttpServletResponse.sendRedirect()
. - Calling
RequestDispatcher.forward()
which includes performing a jsp:forward
- Calling
RequestDispatcher.forward()
which includes performing a jsp:forward
Remember that if you call
forward()
or
sendRedirect()
, any following lines of code will still execute. For example:
| | |
| { ... response.sendRedirect("foo.jsp"); // At this point, you should probably have a return statement otherwise // the following code will run System.out.println("After redirect! By the way ..."); System.out.println("Use commons-logging or log4j, not System.out"); System.out.println("System.out is a bad practice!"); response.sendRedirect("bar.jsp"); /* This will throw an error! */} | |
| |
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