First, $JAVA_HOME should be written before your $PATH statement.
Second, Your path statement with your $JAVA_HOME path statement should be written as follows:

PATH=$JAVA_HOME/bin:/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/home/julien/bin

So your profile should look like this:

JAVA_HOME=/usr/java/j2re-1.4.0_03
PATH=$JAVA_HOME/bin:/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/home/julien/bin


Next you would need to type:

source /etc/profile

or

. /etc/profile #make sure there is a space between the period (.) and slash (/).

or

source ~/.bash_profile

or

. ~/.bash_profile #Make sure there is a space between the period (.) and tilde (~).

or simply logout and then back in to your system to initialize your system to use the new changes to your shell environment.

The dot/period (.) is the same as the "source" command on most systems that don't recognize the "source" command.

HTH

altoine