fileDownloadActionListeners needs to delay retrieving OutputStream from the
response until something needs to be written to the stream
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Key: TRINIDAD-1817
URL: https://issues.apache.org/jira/browse/TRINIDAD-1817
Project: MyFaces Trinidad
Issue Type: Bug
Affects Versions: 2.0.0.3-core
Reporter: Max Starets
Assignee: Max Starets
The issue may be demonstrated by taking our fileDownloadActionListener demo and
modifying it to run with Facelets.
After you click on the 'Click for Error" button, you will get an
UnsupportedOperationException instead of the expected FacesMessage.
The exception is thrown because we calling getOutputStream(), but not
completing the response when we want to report an error.
JSF later calls getWriter(), which is causing UnsupportedOperationException.
This problem does not show up with JSPs because of the side effect of the JSP
engine dispatch - getWriter() simply succeeds.
The solution is to create a proxy OutputStream that retrieves the delegate
stream only when it needs to write.
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