App page link to "federated portal" menu with webdynpro for JAVA

Hi experts,
we have completed the federated portal configuration from EP to CE7.1
Clients just log in EP, see both EP and CE content.
Now, clients want to make a index page with some link and fashion pictures pointed to exact EP or CE page.
I found a method "WDPortalNavigation.navigateAbsolute" which can do this in EP.
but when i change content path to my CE content, the method failed.
WDPortalNavigation.navigateAbsolute(
               "ROLES://NetWeaver_content_producers/<my CE producer's name>/portal_content/...<my path>",
                         WDPortalNavigationMode.SHOW_INPLACE,
                         null,
                         null,
                         WDPortalNavigationHistoryMode.ALLOW_DUPLICATIONS,
                         null,
                         null,
is there something wrong calling the method? or anything else?
Thanks in advanced!
Fishy

any idea?
thanks.

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