About feature

manual

FROM clause (JPQL / Criteria API)

Explains how to use the FROM clause and JOIN expressions in a JPA/JPQL query.... objects are available in memory for navigation. But this feature could also cause performance problems. For example, let's look ...

 
forum_thread

Connection performace after upgrade to objectdb 2

Hi, I have a problem with objectdb 2 when I tried to get the PersistenceManagerFactory and PersistenceManager : In objectdb 1 : PersistenceManagerFactory pmf = JDOHelper.getPersistenceManagerFactory(getProperties(physicalPath, objectName), JDOHelper.class.getClassLoader()); takes only 3ms PersistenceManager pm = pmf.getPersistenceManager(); takes 40ms However, with objectdb 2, the same instructions take respectively : 257ms and 238ms which is very expensive. #1 2012-12-10 17:32 Hi, I have performance problems with objectdb 2 when I tried to get the PersistenceManagerFactory and Per ...

 
forum_thread

JPA vs JDO - which is more efficient for OneToMany queries?

I'm curious about the trade offs between JDO and JPA. Seems to me that JDO will perform better and be statically typed. For example: Assume there are Customers and Orders.... JPA, at least not on this thread, because I say they are feature equivalent. The FAQ discusses which API should be preferred. ...

 
forum_thread

Activation Issue

Hi! We now reached the 10 class limit of ObjectDB. Our license is activated and if I run objectdb activation I get true back. When I start our webapp although I get the following error: ... when using the Retrieving Metamodel without Connection feature (which was implemented following your request two years ago). Build ...

 
issue

again merger missing logs + objectdb exception

we are facing similar problems as we had before, in the log we have a lot of entries merger ... missing + an objectdb exception. Some objects in the system behave strange. This is a part of the log: ... [2017-09-26 12:16:14 #1222 store] SectionClassifier: SectionClassifier{238146996->merger[3309]-missing:1} [2017-09-26 12:16:25 #1223 store] SectionClassifier: SectionClassifier{238146996->merger[3309]-missing:1} ... . Type: * Bug JPA Feature JDO Feature Feature Request Documentation Website Version: ...

 
forum_thread

ObjectDB within a resource adapter module and Java EE Connector Architecture

Has anybody managed to use ObjectDB in a resource adapter module in accordance with the Java EE Connector Architecture so that it may be packaged separately from (but used by components of) an EJB Module after the pattern of the classic EAR File structure as illustrated in the Java EE 7 tutorial in Figure 5-1 EAR File Structure ? ... Check what can work for you and if you define a simple feature request we may be able to implement it. ...

 
forum_thread

persistence.xml classes not respected by ObjectDB

Hi! I have the following persistence.xml. The problem is that ObjectDB loads all the classes in P1 (+ their embeddable classes). P2 is created properly, but P1 gets all entity classes (from P2 also). How can this be avoided, so that both P1 and P2 get just the classes that were specified to each? There is no place in code where P1 tries to access classes from P2, so it makes no sense. ... I didn't say I want that feature to delete the classes. The problem is that ODB creates too many when a ...

 
forum_thread

How to change properties in urls2.xml?

Hello, I am using objectdb in an embedded case with network private access to each database. I see it exists a file name "urls2.xml". <url><main>/var/lib/tomcat7/db/myDb.odb;user=admin;password=admin</main><alt>objectdb://127.0.0.1:38059/;user=$code;password=a2e54ea3-d889-41a7-953c-dabc42877742</alt></url> This file is autogenerated by objectdb. And it describes the locals databases url and their port / user / password properties. ... seems to have no solution ... Should i post a feature request ? edit ...

 
forum_thread

Should I use ObjectDB and JDO?

My application is not meeting required performance because JavaDB appears to be my bottleneck.  I require a faster DB.  Surveying the Internet lead me to believe that ObjectDB might be just what I am looking for (to achieve MUCH faster database access).  But, I have a few concerns.   #1 2016-07-09 15:19 My application is not meeting required performance because JavaDB appears to be my bottleneck.  I require a ...

 
issue

Threaded Test - Failed to commit transaction: Unexpected internal exception

Hi I'm trying to create a simple producer-consumer queue scenario but am getting the followin exception: ... . Type: * Bug JPA Feature JDO Feature Feature Request Documentation Website Version: ...