Andreas,
The problems in this case is that SAP can't get the JDK updates out in time. If you check the SUN site, JRK/JRK 1.6.x.xxx has many security related issues so you want to update the default JDK manually. It is actually very easy to update the JDK engine on the BI 4.1.2 server.
- Download "jdk-7u51-windows-x64" for windows
- Install in the c:\jdk directory and c:\jdk\jre folder
- Create Windows Environment Variables, add system variables called JAVA_HOME c:\jdk
- Update Tomcat java settings
Regards,
Ajay