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Persist error @ManyToMany how to define correct entities relationships

I have Product entities containing a list of Category enties. Each product can have multiple Category but they are all refering to same limited set of Category entities (via ID). There is not changes made to Category from Product. The category ID is taken from the webservice Object ID (unique
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Pessimistic Lock Timeouts setting

where multiple threads can hit a shared counter (which is used to track separate customers product index
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possible index required for improving query performance

objectdb select which index to use when there are multiple indexes? In this scenario we have a composite
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Possible issue for JPQL IN expression

. Using a parameter is also more efficient because the query can be compiled once and run multiple times with different string collections.
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Problem with bidirectional link

of multiple references to the same instance of a class? It's hard to tell with the opaque code
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Problem with distinct select, order by and equivalent alias/attribute path

these restrictions, otherwise the same result may have multiple different order values. Your third query
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Query for objects persisted within the same transaction

I have a question concerning reading uncommited entities with query, within active transaction. For example, I read data from file. Each line contains value of one of entity's attributes but those values are not unique, so it's possible to have a multiple instances of the same entity. To eliminate
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Reading 1.x odb files in ObjectDB 2.x without upgrading

that the converter is not designed for multiple invocations - sorry. If you are interested
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Remove an entity which attributes were changed - OptimisticLockException

to that field. Please check this version number during the operations with one plugin and with multiple
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Replication error on slave restart

(see multiple nested exceptions) at com.objectdb.o.MSG.d(MSG.java:61) at com.objectdb.o