Problem connecting to PostgreSQL on Debian Linux

I've written a JSP that extracts data from a PostgreSQL database and
displays it in a web browser. I tested this on my iBook which is running
OS X 10.2, PostgreSQL 7.2.3, Tomcat 4.1.12, and Java 1.3.1. It runs
fine. So I copied the app over to my server which is running Debian
Linux 3.0, PostgreSQL 7.2.2, Tomcat 4.1.12, and Blackdown Java 1.3.1.
But I can't connect to the database on the Debian box.

Here's some of my settings on the Debian box:

Postgresql.conf
    tcpip_socket=1

Pg_hba.conf
    host    all    127.0.0.1    255.255.255.255    ident sameuser

I've tried to connect writing a little java app to run from the command
line, but it fails: IDENT authentication failed for user "jself"

Here's some of my code:
    Class.forName("org.postgresql.Driver");
    Connection conn = DriverManager.getConnection(
        "jdbc:postgresql:jobdescriptions",
        "jself"
        ""
    );

I've downloaded the pgjdbc2.jar file from jdbc.postgresql.org and put it
in /usr/share/tomcat4/common/lib.

I run my java app the following way: java -classpath
/usr/share/tomcat4/common/lib/pgjdbc2.jar:. QueryJobDescriptions

Is my pg_hba.conf file wrong?

jself is the owner of the jobdescriptions database and has no password

--
Jeff Self
Information Technology Analyst
City of Newport News
Personnel Department Suite 200
700 Town Center Drive
Newport News, VA 23606
757-926-1810