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forum_thread

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(s). The clients do not need to share any data, so each could have its own ObjectDB. Clients have a user base of about 2,000 to 60,000 users that could possibly be using their application at any given time (100k absolute maximum). We will probably have multiple instances per client for availability concerns as well as auto scale during peak usage, at least for the benefit of our web application if not for objectdb.... servers are essentially just doing the replication between master and slaves. Ideally I could just replicate from within ...

 
forum_thread

Filename.odb$ Persisting Issue

Hi, I seem to have a frequent issue with my Filename.odb$ remaining in my /db directory after my program terminates which prevents me from running my program again due to a persistence error thrown by Eclipse. I can't seem to manually terminate the file either. I usually have to fully close Eclipse and wait a bit for it to remove itself. Any ideas why this happens? Thanks, Dragon ... and modifying code for extended time and all variations in between. There is no way to isolate the issue directly as there is no ...

 
forum_thread

Eclipse4 RCP - No Persistence provider for EntityManager

Hello, I'm developing an Eclipse4 RCP application which uses ObjectDB and have the following problem after calling Persistence.createEntityManagerFactory("test.odb") : javax.persistence.PersistenceException: No Persistence provider for EntityManager I'm using the latest ObjectDB 2.6.2.b03. It is integrated in our target platform. It is noticed that since 2.6.2.b02 there is no more integrated javax.persistence & javax.transaction. ... setting the context class loader works only this way (i.e. between building an EntityManagerFactory to building an EntityManager ) ...

 
forum_thread

Left join fetch behaviour doesn't retrieve children?

Hello support, I'm a little bit confused about a left join fetch behaviour. In this test case, i try to fetch my 3 children using a left join fetch. But my collection is null after closing the em. It was expected to be fetched before closing the em, no ? In fact, that is the objective of the fetch purpose (i guess ?). ... to explain the details, but there was a collision between two different fetch operations. ObjectDB ...

 
release

2.4.4

... than 2GB. Fixed a bug in running queries between flush and commit. Fixed a deadlock ( issue #62 ). ...

 
forum_thread

ObjectDB 2.x is working without any activation code

Hi, I downloaded the objectDB from the http://www.objectdb.com/object/db/database/download and then added the objectdb.jar in my classpath. I used the default objectdb.conf file present in the objectdb.jar file and it is working without any activation code.. Is it is bug in objectdb or it works without actionvation code also. I am saving some information into the some.odb file and reading the informatin without any problem. What exactly is the activation code for ? Thanks & regards, ... that you have in one objectdb.conf file and share it between your machines. ObjectDB will automatically find matching activation key ...

 
manual

SELECT clause (JPQL / Criteria API)

Explains how to use the SELECT clause and projections in a JPA/JPQL query.... c . name LIKE 'I%' The only difference between SELECT and SELECT DISTINCT is that the later filters duplicate results. ...

 
issue

Internal exception on flush

Today I received the exception below on running the following code: ... much info. I also don't see a direct connection between these two exceptions. Maybe both exceptions are caused by using ...

 
issue

Once served to JSF page via @EJB query bean, many list fields are null (but same query ok after fresh persist in @PostConstruct)

I have marked this as CRITICAL because although there probably is no database integrity problem, the inability to robustly query relationship fields in a web application renders the ObjectDB system seemingly useless. objectdb-2.2.5_10 NetbeansIDE6.9.1 Glassfish3.01 client-server mode. odb file written to db-files/greendesk/greendesk.odb (see persistence.xml), copy of odb output attached. ... there is no way of demonstrating the distinction between a Guest object and simple relational database table. I ... my main project (although these won't hurt switching between ObjectDB and EclipseLink, we want to keep that option open if possible ...

 
manual

Paths and Types in JPQL and Criteria API

Explains how to use object expressions (path navigation, type) in JPA/JPQL.... ; In the above example, the comparison is between the type of the e object (which may represent any path including a ...