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Activation Issue

.       Actually the activation code is per machine. Use your site license to generate multiple activation codes. You may also specify multiple activation codes in the configuration file (in order to share
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Are Queries in ObjectDB Multithreaded ?

further, and that is expected in future versions. However, if your application use multiple threads that execute multiple queries against ObjectDB simultaneously, then ObjectDB can already use
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ArrayIndexOutOfBoundsException at com.objectdb.o.ALS.c(ALS.java:89)

to create a single EntityManagerFactory with multiple EntityManager instances. It is uncommon to create multiple EntityManagerFactory instances as demonstrated by your code. tuec
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em.flush(); em.clear(); loosing data and not persisting managed objects

have primary keys. The data that I'm using in these entity has multiple fields that are related but takes ... method  of @IdClass and multiple @Id fields and a non annotated POJO as shown in the manual   I doubt
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Entity factory - best practices

one every time. Out of curiosity, is my current method thread-safe? Can multiple entity managers exist at the same time? Creating multiple EntityManagerFactory instances is thread safe but inefficient
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How to open a running db in ObjectDB Explorer?

embedded mode, client server mode supports accessing a database concurrently from multiple processes ... a database concurrently from multiple processes (embedded mode supports concurrently only within a JVM, i.e
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Internal error

cause of this exception is sharing entity objects of one PersistenceManager by multiple threads and / or ... objects of one PersistenceManager by multiple threads and / or other PersistenceManager instances
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java.lang.ClassCastException in OSGi runtime when loading data from DB

when I have multiple bundles using objectdb (e.g. Person, Buildings, Departments, Hardware ... extensive use of OSGi with ObjectDB including multiple bundles with entity classes. Unfortunately we do not
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objectdb.home for client/server

where our object db home is located at as we might have multiple server instances running on multiple
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Optimistic lock failed

your method synchronized. This should work unless your accessing that object in the database from multiple ... again in the catch block. If you still get the error then you can try waiting before trying the transaction again or trying multiple times. FastModel jgleoj23