Maybe your Tomcat session has expired.
Does the problem occur if your application is idle for about 10 minutes? This can be tested as follows: performing a search in order to get a browse page listing some of your documents. Then wait for 10 minutes. After this time, the tomcat session has expired and you will get an error if you click on one of the documents on the browse page. Is this the same error you reported?
Michael
Software AG Germany, Darmstadt
#API-Management#Tamino#webMethods