About lock

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ObjectDB version 2.2.9

. Fixed a NullPointerException in querying an empty database. Fixed a online backup file lock problem
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ObjectDB version 2.6.5

specified in configuration. Fixed optimistic lock exception on removing of a flushed modified
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ObjectDB version 2.3.1

UnsupportedOperationException error message. Fixed a pessimistic lock timeout bug (issue #520). Fixed
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ObjectDB version 2.1.0

Added Online Backup utility (issue #16). Added Master-Slave Replication / Clustering (issue #17). Added a PDF version of the ObjectDB manual (included in the download). Added sample (tutorials) Maven projects (included in the download). Added support of disabling optimistic locking exceptions
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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
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WeakRef Purge ObjectDb threads not stopping with Tomcat (in application container)

.ReferenceQueue$Lock)         at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144)         at java
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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