Thank you all for your response. What I did is: First, I use JSF session bean to call local interface of dao stateless bean to get a folder instance using a EJBQL, then call the folder.getFiles() in the JSF session bean to try to get all files under the folder. If I set fetch=FetchType.LAZY, I would get exception shown above. If I set fetch=FetchType.EAGER, it will work. I do not know why I got the exception on the LAZY. Thanks for your help.
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