openjpa

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Nullable Date column merge problem

I am using JPA with openjpa implementation beneath, on a Geronimo application server. I am also using MySQL database. I have a problem with updating object with nullable Date property. When I\'m t开发[详细]

2022-12-23 05:27 分类：问答
Am I supposed to call EntityManager.clear() often to avoid memory leaks?

I\'m new to开发者_C百科 JPA/OpenJPA and I noticed that if I don\'t call EntityManager.clear() after i persist entities I get an OutOfMemoryError (I keep adding new entities in a loop). I\'m not sure i[详细]

2022-12-20 01:12 分类：问答
openJPA on Java SE

I try to develop JPA project on ibm RAD. And i can run it on Webpshere successfully, but the problem is my machine is quite old. So deploying in Java EE container isn\'t[详细]

2022-12-17 18:47 分类：问答
Reloading of persisted entity

I\'m using OpenJPA in my app开发者_StackOverflow中文版lication as a JPA vendor. The question is theoretical or conceptual:[详细]

2022-12-16 17:04 分类：问答
how to use enum with jpa as a data member of persisted entity?

Please best practice and \'how to\' for using enum with jpa as a data member of persisted entity. what is the best pra开发者_开发问答ctice?[详细]

2022-12-15 05:57 分类：问答
JPA Logging in WebLogic 11g (10.3.1)

How do you enable 开发者_运维技巧debug logging for OpenJPA when running an application in WebLogic 11g?I tried the steps given by Logging JPA SQL with Weblogic 10.3, but no OpenJPA log statements appe[详细]

2022-12-10 10:36 分类：问答
multiple discriminator columns for persistent subclasses

I have banged my self with a very particular problem. Using OpenJPA (KODO 4.1) is there a way to use more than one column as a discriminator column?[详细]

2022-12-10 01:18 分类：问答
SELECT NEW in JPQL

I\'m having an issue with a SELECT NEW query. Query q = em.createQuery( \"SELECT NEW com.bcbst.odstats.ejb.RangeStats(a.folderName, SUM(a.hits)) \" +[详细]

2022-12-09 15:06 分类：问答