About lock

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multiple connection using share folder

database from multiple system  In embedded mode the database file is locked for a single process
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Removed entities can be found by query in the same transaction

 another issue (unexpected optimistic lock exception) but you may want to check if it also solves this issue. btc_es
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[ODB1] Chapter 5 - JDO Connections

Lock Management ObjectDB manages an automatic lock mechanism in order to prevent a database object ... the database a READ lock on that object is obtained by the PersistenceManager. On every attempt to modify a persistent object, within an active transaction, a WRITE lock is obtained on that object by
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[ODB1] Chapter 6 - Persistent Objects

true, and also if one of the persistent fields of obj has been modified. Object States and Locks As explained in section 5.3, ObjectDB manages an automatic lock mechanism in order to prevent two or ... object states and object locks. Only persistent transactional objects that are not new are locked
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[ODB1] Chapter 1 - About ObjectDB

server manages an automatic lock mechanism. Embedded Mode In embedded mode, the application uses ... to the application's classpath. In this mode, the database file is locked for a single process, and multi user