call to response.getOutputStream() during the rendering process fails
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Key: MAGNOLIA-3014
URL: http://jira.magnolia-cms.com/browse/MAGNOLIA-3014
Project: Magnolia
Issue Type: Bug
Affects Versions: 4.2
Reporter: Philipp Bärfuss
Assignee: Boris Kraft
Fix For: 4.3
After the refactoring of the renderers in 4.0 we pass now the writer directly
to the renderer. Which is done by calling response.getWriter(). This is very
useful as this makes the rendering in general independent of the servlet API
and allows direct calls to the rendering engine by Java code (for instance
servlets or tests).
Unfortunately a later call to response.getOutputStream() will fail as this
violates the Servlet API specifications. There are several solutions possible.
Workaround: registering your custom servlet (at the servlets filter) and let
the request be rendered by the servlet and not by the rendering filter
A) Pass a lazy wrapper instead of the writer
instead of passing the writer we pass a lazy wrapper which will call
response.getWriter() only once the first operation is performed on the writer
- not very transparent
+ no changes in the API needed
B) Change the API
Support both variations of renderers. This can be achieved by various ways
B.1) pass a object (magnolia response?) providing both methods which delegate
to the response
B.2) have two methods render(.., writer) and render(.. stream) (most likely by
having two interfaces)
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