Here's my .bash_profile file.

# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin:/usr/java/j2sdk1.4.0_01/jre/bin
export JAVA_HOME=/usr/java/j2sdk1.4.0_01/jre
export PATH=$JAVA_HOME/bin:$PATH
export PATH
unset USERNAME