This is an old thread, but it took me a while to find the answer, so I leave this to others ... It should be:
org.apache.myfaces.FLASH_SCOPE_DISABLED
not DISABLE_FLASH_SCOPE. So add:
<context-param> <param-name>org.apache.myfaces.FLASH_SCOPE_DISABLED</param-name> <param-value>true</param-value> </context-param>
into your web.xml.
Works well with 2.0.5.
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