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Copy Data From One Database to other using hibernate ?

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DDL and data are in mysql database .

we need to migrate to hsqldb.
we are having correct hbm files.

we have successful created the DDL with the help of

<property name="hibernate.hbm2ddl.auto">create</property>

now we need data. so i planned to write a event
say when there is a load in mysql it will save it in hsqldb database.

but i get "org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions"

please help me how to solve this problem.

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