It seems like I should be able to find this with a half hour of searching the webs, but since I cannot:

What are the rules for valid JSF ids?

I read a garbled e-mail message that suggested there were limitations on - and _, but I'm getting IllegalArgumentExceptions and I think it's due to the ids.

EDIT

java.lang.IllegalArgumentException: 6a945017207d46fd82b3d3bb7d2795f1
at javax.faces.component.UIComponentBase.validateId(UIComponentBase.java:549)
at javax.faces.component.UIComponentBase.setId(UIComponentBase.java:351)
at com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:151)
jsf
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