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EM close causes an exception

against the database are still running? Another option, do you use multiple databases in that test ... the other. Do you also have multithreading access to ObjectDB on each JVM? Maybe this issue is related to multiple threads, possibly using multiple databases, but on the same JVM rather than to multiple JVMs? support Support I

Embedded & Activation & Scalation

Hi there, Our app is highly scalable and can be distributed among multiple processes on multiple ... only limitation. Is there a way to spawn multiple server instances "embedded" into our app so we can avoid the single-process restriction though still have multiple processes to avoid a SPOF? Yes, the OEM

Multi-tenant capability with hierarchies

but only with an generel answer. What we need are multiple tenants (would be best if every tenant has its own file/db ... this with ObjectDB? ObjectDB doesn't support queries on multiple databases, so it is possible ... here. You will have to configure the EntityManagerFactory creation to accept a parameter, if you want to open multiple

Mismatch client-server protocol prefix

(AbstractPlatformTransactionManager.java:757) I checked multiple times if the versions match. They do. DB server ... worked for a couple of years now and is used in multiple projects. mosi0815 Ralph Moser Looks like ... also found multiple examples on the Internet where they don't have to use this workaround. I

virtual servers and one file

that's a crutch. Could there be a way in the future to split the database across multiple files? Thank ... either way. > Could there be a way in the future to split the database across multiple files ... a database into multiple files, for example one file per entity class, may help with this particular

PersistenceManager.getObjectsById(Collection,boolean) throwing JDOException

> containing a single oid object (the method is written to support multiple objects ... should return an empty collection. It should work with single or multiple IDs and with any collection ... is expected: Exception in thread "main" [ObjectDB 2.2] javax.jdo.JDOUserException Failed to find multiple

Server vs embedded mode in multi-instance scenario

We are creating a web app that will have multiple different clients, each on their own EC2 instance ... time (100k absolute maximum). We will probably have multiple instances per client for availability ... connections from multiple instances. But from what I can tell, there will be about a 50% performance drop

Database size is much larger than expected (x2)

! You can check it by repeating insertion of a pic of multiples. I can not send the 7GB file ... ). Only entity objects have identity and support multiple references without duplication ... the persistence of my class into multiple copies? TIA gzdillon Lai Yang Sure. You should test


javax.persistence Annotation ManyToMany Target: Fields (including property get methods) Defines a many-valued association with many-to-many multiplicity. Every many-to-many association has two sides, the owning side and the non-owning, or inverse, side. The join table is specified on the owning

Use temporary files to enable very large transactions

you split the transaction to multiple smaller transactions? support Support What is the total size of data ... support. Why don't you split the transaction to multiple smaller transactions ... database page may be stored in the file multiple times representing the state of that page in different

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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