Here's a tips I found trying to do the same as you :Works like a charm!
1. Create an answers.txt file with the word yes inside
2. Launch fhe following command (assuming you want to install jdk-xx.bin)
Tuesday, 26 January 2010
Silent Setup of Sun JDK (Linux, Debian)
I was looking for a way to install the latest Java Runtime Environment without any user interaction and came across this posting