About pessimistic

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Result
2

ObjectDB version 2.2.1

Added support for using ObjectDB with JBoss AS 6.0 / 6.1. Fixed several bugs in handling eager fetch. Fixed a pessimistic locking bug. Fixed a bug in using primary key fields in queries. Fixed a bug in queries on deleted objects before commit / flush.
Result
2

ObjectDB version 2.3.1

UnsupportedOperationException error message. Fixed a pessimistic lock timeout bug (issue #520). Fixed
Result
2

ObjectDB version 2.6.8

Added JPA XML validation schema files to Maven/JEE objectdb.jar. Added automatic release of pessimistic locks on client-server connection failure. Fixed an OptimisticLockException bug on commit after flushing a removed modified entity object. Fixed a NullPointerExeption on new index building. Fixed
Result
0

[ODB1] Chapter 5 - JDO Connections

(optimistic transaction) or pessimistic locking (datastore transaction) is used. The default in ObjectDB