we are having a problem with JPA merge.. we have a customer table and address table with onetomany relationship. so we created a intermediate table ‘customeraddress’. when we go for the customer update test case, we have the customerid and addressid, but the id for customeraddress object is not available.. so its inserting a new row for customeraddress, there by duplicating the customeraddress row. we try to use the merge on the customer object with cascadetype ‘ALL’. how to sovle this problem?