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1

The server cannot start in CentOS

" />     < locking version-check
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java.nio.channels.OverlappingFileLockException

locking conflict. In embedded mode the database cannot be opened by more than one user (process
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Out of memory

" /> < locking version-check="true" />
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Bulk Delete and Update - best practice?

databases (in server mode the database is locked so drop can't be used). The only method I've found
Issue
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NPE at com.objectdb.jpa.JpaQuery.getResultList

(); } } It seems as a separate issue. Maybe related to pessimistic locking
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Activation Issue

="." mode="write" /> < locking version-check="true" />
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Multithreading Test and Deadlock

because of higher memory usage (4 x 10,000 x 100 strings x attribute length => many MBs). Thanks. It solved the dead lock.
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Trouble bug on explorer

.IllegalArgumentException Attempt to lock a new (non stored yet) entity object (error 635) at javax
Result
1

[ODB1] Chapter 5 - JDO Connections

.rollback(); if (!pm.isClosed()) pm.close(); } Automatic Lock Management ObjectDB manages an automatic lock mechanism in order to prevent a database object from being modified by ... time. In an active transaction, on every retrieval of an object from the database a READ lock
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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