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Lock prevents PersistenceManager.close when retainValues = false

for detachment during a PersistenceManager close operation. The retainValues == false mode affects commit

ClassCastException on closing PersistenceManager

embeddable detachment feature. Since this feature was requested by you recently and requires enabling

Fetch Set from DB only works on debug mode

about detached entities in the manual and also see the discussion on this issue including the solution in

Import data from MySQL

data from MySQL using JPA as entity objects, detach the retrieved entity objects and then persist


by invoking clear. JDO provides some additional settings in which objects are automatically detached

Significant I/O costs during batch update or insert data.

Our application has some complex entities. We do batch update(merge detached entity) every 2 minutes. We find the period significant IO costs these days, and disappeared when turn off the batch updating. 1.ObjectDB is in embedded mode. 2.ObjectDB version is 2.3.7 3.Database file size is nearly

Read only hint for query

Second thing after @FetchGroup I've found is read-only hint for EM. You can specify this hint to EM when executing query meaning that returned data will never be edited or persisted. My understanding of this is that each entity returned from query is in detached state as default state. query

Unexpected exception (Error 990) - Merge with no Transaction

I am frequently having an error when merging a detached object outside of a transaction. (Is this allowed? I am not trying to modify the object, just read data from it.) Here is a test case: package com.experiments; import javax.persistence.*; import java.util.HashMap; public class

Use temporary files to enable very large transactions

the first level cache (by flush() and detach()). But an array of bytes, any ObjectDB memory

ObjectDB 2.5.0

Added support of nested paths in JOIN FETCH. Added support of persisting collections and maps of user defined types. Added support of Google (Guava) collections. Added support of inheritance of ID fields. Added support of disabling detachment on rollback in JPA. Added support of using entity

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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