1. Apache Avalon project was closed in 2004. There are no software projects without bugs. And Avalon bugs are not resolved for years!
2. You can't find any documentation about Apache Avalon!
I am a java developer and I was interested in Apache James project and even was going to start contributing some code. But when I started to investigate more about James I could not understand how you could use something that is years old, have no active maintenance and development and even don't have any public documentation. I even can't find any details about what exactly Avalon does! I am absolutely positive that there are a lot of modern alternatives to some Avalon. From the other point of view if Avalon was something good it would not have been closed. Avalon is closed and this means that nobody was interested in it and nobody really needed it.
If you want to attract some non payed developers to your open source project it should be interesting for them to work with your project. But there are references from your site to http://avalon.apache.org/ and when new developers see that site it does not encourage him/her to start to dig deeper.
Avalon is dead. You need to move forward!