ssta@yaffle:~$ java -version
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)
ssta@yaffle:~$ ls -l /usr/bin/java
lrwxrwxrwx 1 root root 22 Apr  2  2006 /usr/bin/java -> /etc/alternatives/java
ssta@yaffle:~$ ls -l /etc/alternatives/java
lrwxrwxrwx 1 root root 30 Apr  2  2006 /etc/alternatives/java -> /usr/lib/j2sdk1.5-sun/bin/java
ssta@yaffle:~$ sudo dpkg -S /usr/lib/j2sdk1.5-sun/bin/java
sun-j2sdk1.5: /usr/lib/j2sdk1.5-sun/bin/java