Thanks for the help. I tried the solo mode, but as I understand it is no possibility to use it in jsr 168 portlets. Unfortunately I didn't get any you private messages Ben.
The link from the portlet jsp to separate jsp I created using
servlet forward. maybe it is the dirty way to do this function, but I didn't find any other one. I was thinking about just using servlet without forward, but it didn't interpret the UTF-8 encoding correctly.
Ina