I solved the problem! I don't know if this is only a problem on my machine. I used a german windows xp professional edition and installed tomcat in de suggested default path unter c:\programms\apache software foundation\tomcat 5.5\...
Seems this is a too long name for shale or something other or some part of the framework or something other is not able to handle blanks in directory names. Now i have reinstalled tomcat under c:\tomcat55. A very short directory name without blanks. After putting the war to this directory and starting the server the example works well. maybe this is only a problem with windows users or with german windows users? i don't know. But the default path to install doesn't work well. Thank's for your help :-) Thomas