I'm unable to serialize a bean more than once using the same Yaml
instance. After the first bean is serialized, subsequent beans are not
serialized as beans, they are serialized as maps. It seems that some
variables to determine if the object is the root object do not get
reset after the first call. (isRoot in Representer). Here is a gist with my failed test case. You can probably work it into
your existing tests easily. http://gist.github.com/151188 Alan Gutierrez

The bug is fixed. Feel free to take the latest source and test it. For your information, avoiding global tags significantly improves ability to exchange the YAML documents between different platforms and languages.

Guess I wasn't quick enough.