I know that the google app mechanism is quite restrictive, it will include opening the source and deleting everything that it tries to write to the file system, and changing the interaction with the database.
You can check this thread and group as a resource for Open BlueDragon as well as the wiki . Looks like they already have a branch that works with compatibility with GAE.
On the Railo side of the CFML open source pond, you can refer to this article from Railo's build help of your choice from the source .
Joining their respective google groups and asking questions should also be fruitful.
Good luck
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