Java based blog website framework - Apache Roller?

I'm a java developer and I am planning to implement a java based blog style website. I'm considering using Apache Roller as the framework for the website and was curious if there were other sugge开发者_如何学Cstions or feedback on Roller. These are some basic requirements:

• Need to support multiple authors for articles
• Search engine friendly
• Framework needs to be customizable (both client side and server side)
• Open source framework desired

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I decided to move forward with Vosao CMS (http://www.vosao.org/) on Google App Engine because I'm looking for the lowest possible start up cost.