Employee example from Book, only blank page

Hi all!
I have installed the CE 7.1 trail and i programmed the example from the SAP book "Java programming with SAP NetWeaver"
I did't change the code, I followed all steps in the book but in the end when i trie to run the application ( the jsp ) i just get a blank page without any errors or hints.
Generally he displays no jsp pages... html pages are working
I tried it with firefox and IE, and java is aktivated.
Maybe anyone here has an idea what the problem could be.
Thankyou for your help
Edited by: seeboeck on Feb 5, 2010 10:47 AM

Select  ▹ System Preferences ▹ Network ▹ Advanced ▹ TCP/IP. What values are shown for the following:
Configure IPv4
IPv4 Address
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