Hi, i am trying to build an API for my company, but i am facing problems: my ERM looks like this:
InstanceITem http://n2.nabble.com/file/n5002254/ERM.png actually i am just trying to insert some elements of InstanceItem using em.merge(). i get a unique constraint violation for Parameter. i have chosen ManyToMany because i want to "recycle" some parameters, becaused i wanted to avoid redundancy. so multiple referencings to the same parameter are possible and very normal for a M2M relation. All data sets are identified by business logic (unique key constraint). so i do something wrong when i use em.merge(instanceItem); ? my mapping file and persistence.xml is appended. http://n2.nabble.com/file/n5002254/orm_mysql_hierarchy.xml orm_mysql_hierarchy.xml http://n2.nabble.com/file/n5002254/persistence.xml persistence.xml thanks for your help in advance Gerald -- View this message in context: http://openjpa.208410.n2.nabble.com/ManyToMany-relations-violating-unique-constraints-tp5002254p5002254.html Sent from the OpenJPA Users mailing list archive at Nabble.com.
