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The class com.vaadin.terminal.gwt.server.AbstractApplicationServlet, which uses java.io.BufferedWriter, does not render portlet content when running on the JBoss Portal.
I fixed it with using java.io.PrintWriter.
What exactly is the problem when using BufferedWriter? I do not have JBoss portal installed at the moment so I cannot test it but it sounds a bit strange that BufferedWriter would cause problems.
I read somewhere this was a bug on jBoss portal 2.7.x or 2.7.2.
We solved it by changing some of the Vaadin code (method writeAjaxPage). Instead of
This worked for us.