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about Entity relationship locks when Pessimisitc_write is set for an entity instance

 
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Hi,
In test 1 of Enthuware, it points out that


When an entity instance is locked using pessimistic locking, the persistence provider must lock the database row(s) that correspond to the non-collection-valued
persistence state of the instance...... Entity relationships for which the locked entity contains the foreign key will also be locked, but not the state of the referenced entities....



I tried the example in ToyAppForJPA,




Suppose, I have CustOrder id =1, Address_ID = 1.
And also I have Address id=1, zipcode = 11111 and Address id =2, zipcode = 22222.

I expect there will be an exception thrown when I attempt to change CustOrder id 1's address from 1 to 2 because the spec says the entity relationship is locked as the lock mode is set as PESSIMISTIC_WRITE.
I don't know why I can successfully change the address for CustOrder 1 ?

 
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