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trans-attribute in ejb-jar.xml for MDB

 
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Hi All,
could anyone pls tell me the significance of
"trans-attribute" if set to:
1) "NotSupported" :
2) "Supports"/"Required"(difference?):

I have written MDB which has DB transaction to populate values from DB table, which attribute is suitable in this scenario.

Thanks in advance.
 
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Shaily,
"Not supported" means the MDB won't use a transaction. "Required" means the MDB will use a transaction. "Supported" does not apply to MDBs. In a session bean, it is used to mean the caller may or may not supply a transaction.
 
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