Version 1.3 might be at: ftp://ftp.tux.org/pub/java/debian/dists/.
Alternatives include:
deb ftp://ftp.informatik.hu-berlin.de/pub/Java/Linux/debian woody non-free deb http://www.mirror.ac.uk/sites/ftp.blackdown.org/java-linux/debian woody non-free
The package is named j2sdk1.3
The Blackdown Java 2 Runtime Environment package (j2re1.3) is also available from:
deb ftp://metalab.unc.edu/pub/linux/devel/lang/java/blackdown.org/debian woody non-free
Java 2 Runtime Environment 1.4 (j2re1.4) is available from:
deb ftp://ntama.uni-mainz.de/pub/debian unofficial/
The Debian Java FAQ is available from http://www.debian.org/doc/manuals/debian-java-faq/.