The ProgressAsyncBean that is a part of the AsyncProgress component in our 'Composite Components' or 'Enterprise Components' works fine with the SessionRenderer. Once the SessionRenderer is replaced with the PushRenderer, we get the following Exception thrown when a render call is made:

Exception in thread "pool-1-thread-1" java.lang.RuntimeException: FacesContext is not present for thread Thread[pool-1-thread-1,5,main]
at org.icefaces.application.PushRenderer.missingFacesContext(PushRenderer.java:182)
at org.icefaces.application.PushRenderer.render(PushRenderer.java:131)
at com.icesoft.faces.facelets.component.progress.ProgressAsyncBean.afterExecute(ProgressAsyncBean.java:79)
at com.icesoft.faces.facelets.component.progress.AfterExecuteThreadPoolExecutor.afterExecute(AfterExecuteThreadPoolExecutor.java:39)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:888)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

The ProgressAsyncBean is in view scope.