About optimistic

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Updating Entities

get an odd error message... Caused by: com.objectdb.o._OptimisticLockException: Optimistic lock failed
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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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ObjectDB version 2.7.6

mode (no enhancement) by minimising  tracking backups. Fixed a regression optimistic lock exception
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[ODB1] Chapter 5 - JDO Connections

.option.Optimistic", "false"); properties.setProperty( "javax.jdo.option.NontransactionalRead ... another type of transaction called optimistic transactions. When using optimistic transactions, objects ... succeeds while the second fails, throws an exception, and is rolled back automatically. Optimistic
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[ODB1] Chapter 9 - ObjectDB Explorer

the last locally opened database file when the Explorer starts. Transaction type (datastore or optimistic