How to install Glassfish in Ubuntu 10.10 EC2 Amazon

I have tomcat 6 installed in my large server Ubuntu maverick but seem it's performance not good eventhough tweak on memory and anothers. So, now i try with Glassfish. Installing Glassfish same easy with installing tomcat 6. But, i use independent zip files rather try to finding .deb or native package for it. Here are steps for installing :

Checking Java instalation :
sudo add-apt-repository "deb http://archive.canonical.com/ maverick partner"
sudo apt-get update
sudo apt-get remove openjdk-6-jre-headless
sudo apt-get install sun-java6-jdk  sun-java6-jre sun-java6-javadb
sudo apt-get autoremove

1. Download zip files and extract
wget -c http://download.java.net/glassfish/3.0.1/release/glassfish-3.0.1-ml.zip
unzip glassfish-3.0.1-ml.zip

2. Configure and change default port for Glassfish if tomcat already use port 8080
vim glassfishv3/glassfish/domains/domain1/config/domain.xml

3. Running by Glassfish
./glassfishv3/glassfish/bin/asadmin start-domain --verbose

4. Enable port 4848 and 8081 in security Groups via EC2 Amazon admin panel.

5. Go to your-domain:8081 to see web page and your-domain:4848 for administrator pages