About Data Source

tutorial

Step 3: Define a Spring DAO Component

Explains how to define a JPA DAO component (bean) in an Eclipse Spring MVC JPA web application project.... on the database will be performed by an instance of a Data Access Object (DAO) that we will define in this step as a Spring MVC ... Now replace the content of the new source file with the following code: package guest ; ...

 
api-jdo

getSource()

The source object of the Event.(Method of javax.jdo.listener.InstanceLifecycleEvent)

 
forum_thread

object creation during pmf.getPersistenceManager()

Hi ... read from file via deserialization, file has size 2MB. The data model is legacy and in default constructors it create also a lot of ... block. Avoid overflow of published source code examples by breaking long lines . You may mark in ...

 
issue

Negative snapshot user count exception

I found the following stack trace in my log files; it's cropped up a number of times: ... including a few weeks against a copy of the production data, without incident. The problems only occurred after running on the ... block. Avoid overflow of published source code examples by breaking long lines . You may mark in ...

 
forum_thread

Object explorer cannot open odb file. ObjectDB many-to-many relationship

I created a data model to test many-to-many relationship with a link table as following (full code in attachement) ... 15:38 I created a data model to test many-to-many relationship with a link table as following ... block. Avoid overflow of published source code examples by breaking long lines . You may mark in ...

 
forum_thread

UserException: Invalid configuration in 'internal' - Check permissions

Hi all,   I have a master/slave code so that each slave reads a subset of points of the same database. ObjectDB entities do not allow serialization and so I have sent, to each slave, the file path. With such information I have tried to create an entityManager, in each slave, as follows: EntityManagerFatory entityManagerFactory = Persistence.createEntityManagerFactory(filePath); EntityManager = entityManagerFactory.createEntityManager(); However I get the following error ... at com.jscilib.jppf.math.data.stats.bin.ComputePCA.main ( ComputePCA. java :129 ) at ... Persistence. java :54 ) at com.jscilib.jppf.data.db.odb.ObjectDBBulkDataset. <init> ( ObjectDBBulkDataset. ... block. Avoid overflow of published source code examples by breaking long lines . You may mark in ...

 
forum_thread

Need help to analyse very high memory usage by objectdb (PRU, SEV, VAL[])

Hello, we have a useCase in which we consume too much memory and run into a "GC overhead limit exceeded" exception. Nearly 90% of the memory are taken by com.objectdb.o.PRU (49%) com.objectdb.o.SEV (29%) and com.objectdb.oVAL [] (9%). When debugging, we did not get the reason for the high memory consumption yet. Can you give us any any hints, which leads to the generation of these objects? We assume that we (erroneously) refer to too many entities in the memory. ... large insert / update transactions, with large amount of data pending to be written to the database on commit.   ... block. Avoid overflow of published source code examples by breaking long lines . You may mark in ...

 
forum_thread

Using the wrong class to access a database

Hello, just starting to test ObjectDB and ran into a problem. I've created a small program to test the Point database described in the Getting Started section: ... same as the first; it only calls the retrieve method, no data is added. The package name is 'com.objectdb.test2'. The ... block. Avoid overflow of published source code examples by breaking long lines . You may mark in ...

 
forum_thread

Multi-thread access to single EM's entities

If my entity classes have synchronized getters and setters, is it reliable for multiple threads to access a single EM's managed entities, as long as only the thread that created the EM interacts directly with it?  I've tested this and it seems to work... but I know better than to depend on the observable behavior of multithreaded code. When I run this example and examine the database, the entity contains the value set by the second thread, as expected.   ... application: a client that parses and stores data from the ancient text-based game TradeWars 2002. ... block. Avoid overflow of published source code examples by breaking long lines . You may mark in ...

 
forum_thread

Calendar in Criteria Querys

Hi, i am having troubles creating criteria querys for Calendar objects. As far as I can see CriteriaBuilder has no methods for checking if one Calendar is bevor or after another. Javas Calendar Class got such methods, but i dont know how to use those in my query. ... java.sql.Timestamp - representing both data and time. If possible, you should use these types instead of ... block. Avoid overflow of published source code examples by breaking long lines . You may mark in ...