My distribution is CentOS4,
now I can't start up my Arureus.
But I have installed JAVA.(jre1.5)
The mistake looks like:

[redbud@mirror azureus]$ ./azureus
Starting Azureus...
Java exec found in PATH. Verifying...
Suitable java version found [java = 1.4.2]
Configuring environment...
Loading Azureus:
java -Xms16m -Xmx128m -cp "/home/redbud/app/azureus/Azureus2.jar:/home/redbud/app/azureus/swt.jar:/home/redbud/app/azureus/swt-mozilla.jar:/home/redbud/app/azureus/swt-pi.jar" -Djava.library.path="/home/redbud/app/azureus" -Dazureus.install.path="/home/redbud/app/azureus" org.gudy.azureus2.ui.swt.Main ''
Warning: -Xms16m not understood. Ignoring.
Warning: -Xmx128m not understood. Ignoring.
./azureus: line 112: 5626 segment error ${JAVA_PROGRAM_DIR}java -Xms16m -Xmx128m -cp "${CLASSPATH}" -Djava.library.path="${PROGRAM_DIR}" -Dazureus.install.path="${PROGRAM_DIR}" org.gudy.azureus2.ui.swt.Main "$@"
Azureus TERMINATED.
[redbud@mirror azureus]$
[COLOR=red]

I think you need the java sdk as well

I have solved this problem!
I jsut edited "azureus" by using a text editor like "gedit",
and write "JAVA_PROGRAM_DIR=/usr/java/bin"(wherever you installed the java to).