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7

Query and commit simultaneously

the database at the same time using multiple threads. However, if all the threads share the same ... ) and you have to use multiple EntityManager/PersistenceManager instances, usually one per thread
7

how to operate with same object but two different Thread on database.

Bimal kumar dalei Usually multithreading with JPA involves multiple EntityManager instances ... database object is represented by multiple separate memory objects in different entity managers
7

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? Flying Banana Jiacong Xu Creating multiple EntityManagerFactory instances is thread safe
7

Selective merge/cascade of detatched entity

memory is that they are shared between multiple threads (all using 'synchronized' operations for field ... entity objects. To avoid multiple memory objects for the same database object you may try sharing
7

java.lang.ClassCastException in OSGi runtime when loading data from DB

how I should get this working when I have multiple bundles using objectdb (e.g. Person, Buildings ... alexweirig Alex Weirig Some ObjectDB users make extensive use of OSGi with ObjectDB including multiple
5

InternalException & UserException using objectdb with Jboss AS 7.1.1 final

Hello. We are currently using ObjectDB in application server Jboss as 7.1.1.final. ObjectDB version is 2.5.3_02. The following errors occur when multiple ajax requests are executed: Caused by: com.objectdb.o.InternalException: Error reading UTF string Caused by: com.objectdb.o.UserException
5

Pessimistic Lock Timeouts setting

where multiple threads can hit a shared counter (which is used to track separate customers product index
5

EntityManagerFactory objects being locked during EntityManager creation

of the EntityManager instances). Using multiple EntityManagerFactory Instances. support Support
5

Online backup problem

Hi, We are trying to create a servlet that performs database online backup. Unfortunately, even though no exception is thrown, backup files aren't created. When I turn on DEBUG logging in ODB, I get multiple ClassNotFoundExceptions like : [2011-06-04 05:34:14 #2 type.loader] java.lang
1

combined index not used

the next post). As you have several heavy queries with multiple JOIN operations with very slow execution

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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