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1

Entity Version History

ObjectDB manages automatic entity versioning (for optimistic lock purposes). Every entity object modification is reflected by a new version number. Naturally, previous values in the entity object that are overridden by new values are discarded. Some applications may benefit from the ability
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EOFException

internal file lock protection. Modifying the database file externally not through ObjectDB (e.g. by
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exception during online backup

cannot access the file because another process has locked a portion of the file at java.io
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Exception occurs on Linux during commit

.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java
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Explorer in 2.3

to lock a non entity object". The change stays on the screen, but is not persisted to the database
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FileNotFoundException

I'm sometimes getting this exception.  Is there a simple answer to why it's occurring?  (It could take some time to produce code that results in this exception reliably). Caused by: java.io.FileNotFoundException: /tmp/objectdb/tmp/objectdb_1252962966569709153/lock.lck (No such file or
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find() cost unreasonable time!

? > Would you please give another advices? You can keep the refresh and also use locking. This is not related to moving from
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First query takes 4+ minutes to complete

" sync="false" path="$objectdb/" mode="write" /> <locking version-check="true" />
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Getting exception while executing the Query

I have facing a problem when i am executing the query first time, Please find the stack trace below java.lang.InterruptedException at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1301) at java.util.concurrent.Semaphore.acquire
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java.nio.channels.OverlappingFileLockException

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