I only copied the related codes here, I used a long run converstaion...there is some for begin and end the conversation, like other bean I used.
Do you have a producer for your EntityManager?
Also, do you have the beans.xml file in the correct place?
I have posted many topics on Seam 3 forum.
I am sure it is not caused by these issues.
There is a save button in the page, it works well.
Currently, I have tried to use some richfaces 4 components in Seam3 application, only the dataTable seems no problem.