You have the right default(5) set. Maybe, try 4 and if it doesn't work I would switch it back to 5.
You can also open your azureus script located in your azureus directory and manually change the location that it should look for java.
Code:
look_for_java()
{
JAVADIR=/usr/java
change the "/usr/java" to what is reflected in your file system. Something like "/usr/lib/j2re1.5-sun" or "/usr/lib".